To translate an Environmental Product Declaration (EPD) and EN 15804 life-cycle module table, the first job is not to choose elegant equivalents for sustainability words. It is to protect the declared unit, boundary, module codes, numerical signs, modelled assumptions and status of each environmental result. A1–A3 describes the product stage, A4–A5 construction processes, B modules use, C modules end of life, and Module D effects beyond the system boundary. A translation that blurs those boundaries changes the claim even when every digit remains unchanged.
This educational guide answers high-intent searches including translate EPD A1 A2 A3, EN 15804+A2 modules explained, EPD Module D negative values, cradle to gate versus cradle to grave translation, EPD declared unit versus functional unit, embodied carbon table translation, biogenic GWP translation, and EPD reporting comparison between languages. It is for technical translators, construction-product exporters, architects, procurement teams, learners and editorial reviewers who need usable wording without invented environmental certification.
The narrow question here is how to translate one construction-product EPD so its life-cycle stages, indicators and assumptions still mean exactly what the source reports. The wider method of translation belongs to Master Art of Translation. For word learning and grammatical explanation, the protected Vocabulary Learning Hub and How English Works retain their separate roles. This article does not replace those resources or provide a general translation hub.
First read the EPD as a structured scientific claim
Begin with the product identity, programme operator, declaration number, publication status, product category rules, unit, standard edition and declared module scope. Only after these fields are pinned down should the translation team handle the indicator tables. This order prevents an attractive headline from outrunning its evidence. For instance, “low-carbon product” may be a marketing description, but an EPD normally reports defined impacts per unit within specified modules, not an all-purpose endorsement.
Keep the EPD layout as navigable as the original. A narrow smartphone layout may require stacked tables, but each column must remain associated with its module and unit. When a target language has longer labels, abbreviate only with a legend. The codes A1–A3, A4, A5, B1–B7, C1–C4 and D are stable cross-language anchors; they are not ordinary words to translate phonetically.
1. The declared unit
What it means. The declared unit names the quantity to which EPD indicators refer: perhaps one kilogram of product, one square metre of insulation at a stated thickness, or one cubic metre of concrete. A number printed without that denominator is not a portable environmental figure. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A translator who changes a square-metre product declaration into a per-kilogram claim has quietly changed the result, even when every carbon figure is copied exactly. Never assume competing products were evaluated at an equivalent service performance. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Keep both the numerical quantity and its qualifying material description beside the translated environmental indicators. In a comparison, first ask whether density, thickness, strength, covering capacity and installation losses require a declared conversion. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. For a fictitious insulation sheet with 12 kg CO₂e per square metre, do not render the claim as 12 kg CO₂e per kilogram. Confirm sheet thickness, reference mass, intended function and any approved conversion before publishing. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
2. Functional unit versus declared unit
What it means. A functional unit describes the service being compared, not merely the mass leaving a factory. A declared unit may be useful for inventory while a functional unit connects impacts to durability, thermal resistance, acoustic performance or another specified benefit. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Translating both expressions as ‘one unit of product’ strips out the reason an environmental comparison can be valid or invalid. A lighter product is not automatically better if it has a shorter service life or provides less protection. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Record whether the source gives a declared or functional unit and translate its full performance conditions. If two EPDs present different denominators, explain the mismatch rather than flattening the units. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Imagine a cladding comparison where one option requires replacement twice during a building study period. The translator should preserve the replacement assumption rather than comparing initial production impacts alone. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
3. Product stage A1
What it means. A1 covers raw material supply as modelled in the applicable product category rules. Extraction, upstream processing and relevant purchased inputs may appear here; it is not a synonym for all manufacturing or all transport. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. An editor can turn A1 into ‘factory emissions’ because both sound like production. That confuses the origin of a burden with what happens in the factory itself and makes a material-specific hotspot disappear. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate A1 with its module code retained, then explain the plain-language boundary as upstream material supply. Keep assumptions about recycled input, primary resources and upstream data attached to the relevant values. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. If an EPD reports significant upstream aluminium impact under A1, a translated press release must not attribute the number solely to the extrusion plant’s electricity bill. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
4. Inbound logistics A2
What it means. A2 usually represents transporting raw materials and inputs to the manufacturing site. It is not the delivery of the final product to the construction site, which is a different question in the module system. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. The deceptively small phrase ‘transport emissions’ can migrate from A2 to A4 during translation. When tables are exported to spreadsheets, these columns may look interchangeable even though their freight routes differ. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Spell out transport of inputs to manufacture. Preserve distance assumptions, transport modes, load factors, return journeys and geographical context where the EPD supplies them. Do not substitute a local route without recalculation. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Suppose a product uses imported cementitious inputs but is manufactured near the project. A2 may be substantial even when A4 is short. Translate both boundaries separately. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
5. Manufacturing A3
What it means. A3 relates to manufacturing processes and associated flows as defined in the EPD model. The manufacturing module is not a claim that the entire life cycle occurs inside the factory gate. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A marketing text may take a low A3 figure and announce that the product has low life-cycle emissions. That leap ignores upstream materials, site transport, use, maintenance and end-of-life scenarios. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate manufacturing rather than whole-life production, and show the A3 column alongside A1 and A2 when the declaration provides separate data. Describe any allocation methods only as reported. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A factory powered by cleaner electricity may reduce A3, while carbon-intensive feedstock keeps A1 high. Good translation preserves that causal separation instead of attributing every change to electricity. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
6. Combined A1–A3
What it means. Many EPDs report A1, A2 and A3 as one aggregated product-stage value. This ‘cradle to gate’ number is valuable, but its gate is the factory boundary, not the end of a product’s life. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Turning ‘cradle to gate’ into ‘cradle to grave’ is a serious translation error. Even an accurate metric becomes misleading if the boundary silently expands to demolition and waste management. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Retain the compound A1–A3 code, explicitly describe raw materials, incoming transport and manufacturing, and do not claim the separated contribution of a single stage where only a combined number exists. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A hypothetical product lists A1–A3 GWP as 80 kg CO₂e per declared unit. The translation may call it product-stage GWP, but not a verified full-building lifetime result. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
7. Construction transport A4
What it means. A4 covers transporting the finished construction product to the project location under the EPD scenario. It may involve assumed delivery distances, vehicles, fuel, load factors and route conditions rather than measured project shipments. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A source table can say A4 ‘not declared’ while sales literature implies zero distribution impact. Another error treats a modelled national-average A4 scenario as the actual footprint of a specific international shipment. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate the transport scenario, rather than inventing a delivery record. Explain whether A4 was declared, not declared or calculated for a project separately from the published EPD. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A prefabricated panel transported 100 kilometres by road and the same panel shipped overseas can have different A4 values. The product-stage declaration does not determine the project-specific route. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
8. Installation A5
What it means. A5 includes construction and installation processes according to the relevant calculation rules and scenarios. Material losses, site energy, packaging treatment and installation-related activity can matter, but the declared modelling assumptions control inclusion. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. ‘Installation impact’ may be reduced to labour cost or skipped as if it were included in the factory gate. The EPD’s waste factors and waste destinations can be more important than a simple narrative suggests. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Preserve the assumed percentage of offcuts or broken product, packaging treatment, site machinery and any credits or burdens allocated to the appropriate modules. Don’t substitute a generic installation method. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A tile EPD can model cuts and discarded material. Translating the A5 result for a no-waste installation scenario without revising the model would conceal the source’s operational assumption. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
9. In-use product effects B1
What it means. B1 concerns relevant environmental effects of the product during normal use, as defined in the model. It should not be automatically equated to all household energy consumption or the total operational footprint of the building. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A translator who explains every B-stage number as ‘electricity use’ masks products that emit substances, absorb carbon or otherwise have modelled in-use processes. Different indicators answer different questions. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Use the exact stage label ‘use’ with the source-defined scenario. If a product has no declared B1 result, avoid assigning a precise zero or making claims about indoor safety. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A coating’s B1 modelling cannot be copied to a different coating system simply because the products share a colour or broad category. The translation must keep the specified product system. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
10. Maintenance B2
What it means. B2 describes maintenance during the reference period, including appropriate cleaning, treatments or consumables when captured by the declared scenario. It differs from repairing a damaged product and replacing it altogether. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. The words ‘maintenance’, ‘repair’ and ‘replacement’ often translate similarly in casual prose, but the module system separates them because resource demands and timing differ. Collapsing them causes double counting or omission. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Retain the B2 code and state any frequency, consumable and cleaning assumptions. Preserve the time basis, since annual maintenance impacts and whole-period maintenance impacts are not automatically comparable. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Imagine paint cleaned every year and recoated every ten years. Cleaning may belong to maintenance, while a separate treatment can be represented differently under the relevant declared scenario. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
11. Repair B3
What it means. B3 concerns repair actions that restore product performance without being treated as complete replacement under the declared model. It can require parts, labour, equipment and waste flows, depending on the product and assessment scope. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Readers may interpret ‘repair’ as an unconditional promise that the product is repairable. An EPD scenario does not itself guarantee that repairs are technically, commercially or contractually offered. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate B3 as a scenario-based repair impact, not a warranty clause. Where the report describes quantities and expected repair events, place them next to the corresponding numbers. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A door assembly with a hypothetical repair event differs from an assembly that is entirely replaced. A translated report should state which event the EPD model actually includes. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
12. Replacement B4
What it means. B4 relates to product replacement during the reference study period. Reference service life, number of replacements and assumed timing often drive its value; replacement may reintroduce manufacturing and disposal burdens. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A single word such as ‘renewal’ may hide whether the whole product or a component is replaced. Worse, presenting A1–A3 alone for short-lived and long-lived products makes the comparison unfair. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Keep the number of replacements and reference period explicit. Check whether the reported B4 impact includes or references other modules under the relevant calculation method, avoiding unexamined arithmetic. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. For a 60-year study period, a product modelled with 20-year service life cannot be assumed to remain unchanged for six decades. Translate the replacement scenario without inventing future performance. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
13. Refurbishment B5
What it means. B5 addresses refurbishment actions within the model, often larger interventions than routine maintenance. It should not be confused with the entire renovation of a building or the purchase of a completely new system. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. ‘Refurbishment’ can become ‘replacement’ or ‘restoration’ in target language, collapsing the distinction between partial intervention and full renewal. That affects both physical quantities and environmental calculation boundaries. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate the intervention as the source describes it and retain B5. State what is refurbished, when the action occurs and which ancillary processes are included, rather than assuming a uniform definition. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A flooring surface refinished after 15 years is not necessarily equivalent to removing and reinstalling the entire floor. The module label alone cannot settle that distinction. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
14. Operational energy B6
What it means. B6 records operational energy use attributed to the building or system under the relevant assessment, often requiring scenarios, efficiency assumptions, climate and study period. It is not identical to embodied carbon in product manufacture. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Confusion arises when a product-saving-energy marketing claim is placed into an EPD as if the reduction were measured for all climates. A product may influence B6, but a case-specific building calculation is needed. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Keep operating conditions, climate assumptions, energy source, period and reference system visible. If an EPD does not report B6, do not fill the gap with a promotional savings estimate. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Consider glazing specified for two climate zones. Its embodied impacts may be similar while heating and cooling effects differ substantially. Translate the scenario rather than exporting one universal saving. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
15. Operational water B7
What it means. B7 concerns operational water use in the relevant building or product scenario. It is separate from the water-use environmental indicators that may be reported for production and other life-cycle stages. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. One water-related column may express cubic metres used, while another describes environmental scarcity impact in a method-specific unit. Translating both as ‘water consumed’ destroys their analytical distinction. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Identify whether a field is B7 operational water or a water impact indicator. Preserve units, boundaries, functional assumptions and whether the value is inventory flow or impact assessment result. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A water-efficient fitting may affect operational use, but an EPD for its manufacture may report water indicators without assessing lifetime household water demand. These are different answers. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
16. Deconstruction C1
What it means. C1 covers deconstruction or demolition in the specified end-of-life scenario. The model may assume manual removal, mechanical demolition or other procedures, and actual site practice can diverge. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Translating C1 simply as ‘recycling’ moves the demolition activity into a later process and may mislead readers about recoverability. It also makes demolition energy look like a manufacturing burden. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Retain deconstruction or demolition as the C1 activity. Show that it is an end-of-life scenario, not a guarantee about the contractor’s future dismantling method. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A demountable partition and an adhesive-bonded assembly may require different removal methods. The translation should explain the scenario rather than presuming the same C1 impact. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
17. End-of-life transport C2
What it means. C2 addresses transportation after removal to subsequent treatment, disposal or recovery destinations. It is distinct from A2 inbound materials logistics and A4 delivery to construction site. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Mislabelled ‘return transport’ can imply products will be sent back to the original manufacturer. That may be untrue when the EPD assumes local sorting, recycling facilities or landfill. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Keep route assumptions and modes linked to the end-of-life destination. If transport distances are generic rather than project-specific, say so and avoid calling them verified actual routes. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Suppose removed steel travels to a recycler but insulation travels to a disposal facility. A single translated phrase ‘transport to waste’ may conceal the scenario’s different material streams. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
18. Waste processing C3
What it means. C3 includes waste processing for reuse, recovery or recycling as defined under the relevant product-system rules. It is not proof that the final recovered material will displace virgin material on a one-for-one basis. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A brochure can turn a C3 recycling process into a ‘100% recyclable’ declaration. Processing impacts, collection yields, contaminants and output quality are independent variables that translation must keep apart. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate the process and its assumptions without turning modelled recovery into a guarantee. Where separation efficiency, sorting loss or product quality is given, retain it precisely. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. An EPD may model metal sorting and remelting, while a local project cannot collect the same stream. The published scenario remains evidence of a model, not a certificate for the local outcome. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
19. Disposal C4
What it means. C4 covers disposal processes in the chosen end-of-life model. Its meaning depends on waste treatment pathways and local regulatory contexts, which the source may specify through scenario descriptions. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. ‘Disposal’ is sometimes softened into ‘return to nature’, erasing landfill, incineration residues or treatment assumptions. That is not an editorial improvement; it is an inaccurate environmental claim. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Use a clear equivalent for disposal and name the modelled pathway where provided. Keep landfill and other treatments distinct, along with any reported emissions or residues. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. When a source describes a landfill scenario, a translation must not recast it as recycling simply because the manufacturer’s current corporate strategy emphasizes circular economy goals. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
20. Module D beyond the boundary
What it means. Module D reports potential benefits and loads beyond the product system boundary from reuse, recovery or recycling under stated methods. It is separately reported and should not be silently folded into A–C. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A negative number under D is often promoted as a guaranteed carbon saving from the purchased product. The figure may depend on substitution assumptions and future recovery markets, which are not settled facts. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Retain the separate D column, its sign and its scenario, and state that it addresses beyond-system effects. Do not subtract it indiscriminately from every other result or compare totals built using incompatible rules. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. If an EPD reports 100 kg CO₂e for A1–A3 and −20 kg CO₂e in D, translating that as a single ’80 kg life-cycle footprint’ conceals boundaries and assumptions. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
21. ND, MND and zero
What it means. A table entry marked ND or MND indicates that a module or indicator was not declared, according to the table convention. A literal zero is a stated result, often subject to precision and calculation rules. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Replacing ND with zero creates apparent environmental performance where no result was reported. Replacing a tiny rounded value with an absolute absence of impact can be equally misleading. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Preserve the source’s symbols or write their expanded legend. Explain any discrepancy between excluded modules and modelled zero values without guessing the reason for non-declaration. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Suppose A4 reads ND in one EPD and 0.00 in another. Those entries do not support an equal-impact conclusion. An honest translation keeps their differing evidence status. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
22. GWP total and GWP fossil
What it means. Global warming potential may be subdivided into fossil, biogenic, land-use and land-use-change contributions, plus a total, according to the reporting method. The labels matter because their scopes can differ. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Translating every GWP label simply as ‘carbon footprint’ loses methodological structure. It can lead to false comparisons between an A1-era indicator and an A2-era set of indicators with different accounting. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Retain the exact indicator name, sign, unit and method where possible. When comparing reports, check whether they follow the same EN 15804 amendment and declared boundary. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A wood-based product’s GWP-biogenic line may carry a negative figure during one stage. That is not permission to say the product has negative total climate impact under all scenarios. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
23. Biogenic carbon and timing
What it means. Biogenic carbon accounting follows the relevant method’s treatment of carbon uptake, storage and release. A negative product-stage value may be accompanied by positive end-of-life values in later modules. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A translator can mistake a negative stage figure for permanent carbon removal, while the same model anticipates eventual release. Scientific signs are not editorial adjectives that can be intensified for marketing. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Present the life-cycle context, keeping A, C and D results separate. Where timber and bio-based material claims involve storage duration or end-of-life assumptions, state those conditions. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. For a hypothetical timber panel, product-stage biogenic uptake and later combustion emissions can occur in separate columns. Both belong in the translated account. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
24. Scientific notation and units
What it means. EPD tables often use scientific notation such as 1.2E−3 and units including kg CO₂e, MJ, m³, kg Sb-eq or method-specific equivalents. Decimal separators and superscripts must survive export. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A localisation workflow can convert 1.2E−3 into 1.2E3, turning a small result into a million-fold error. Converting m³ to m² or kg to tonnes without calculation creates comparable damage. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Protect numeric cells, restore superscripts and minus signs, and use a documented locale rule for commas and decimal points. Never translate a unit merely because it resembles an ordinary word. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. If 2.5E−4 kg is displayed as 0.00025 kg, the conversion is valid; if it becomes 0.00025 tonnes without adjustment it is not. Verify magnitude independently. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
25. Resource and waste indicators
What it means. EPDs may distinguish primary renewable and non-renewable energy, secondary materials, freshwater flows and different waste categories. A results table is not one generic sustainability score. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Replacing all resource indicators with ‘resources saved’ implies a beneficial direction that many positive inventory flows do not represent. Labels such as hazardous waste disposed require exact wording. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate each indicator’s precise name, acronym and unit. Keep resource use separate from impact category results and avoid suggesting that every figure can be added into a common total. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A product might use renewable energy and still have substantial GWP. Those fields are not redundant, and an accurate multilingual explanation must resist the temptation to rank them by a single adjective. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
26. Water-scarcity impact versus volume
What it means. A water impact indicator may incorporate scarcity characterisation, whereas an inventory measure reports a physical volume under its chosen boundary. Their units and calculation method can differ. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A reader may see a larger water indicator and assume more litres were physically withdrawn. That is not necessarily correct because impact depends on where and how the water is used. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate the indicator’s formal name and unit first, then explain whether it is an impact-weighted result or an inventory volume. Keep geographical modelling assumptions attached. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. An industrial process in a water-stressed region can have a different scarcity impact from an equal-volume process elsewhere. A translation that reports only litres may conceal the underlying method. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
27. Product category rules
What it means. A product category rule, or PCR, governs how an EPD is prepared for its product category, typically in conjunction with broader standards. It controls assumptions, reporting and comparability. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. The word ‘rule’ can be weakened into ‘recommendation’, or an EPD can be mistaken for a general eco-label award. Neither conveys the method’s procedural role in a verified declaration. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Keep the PCR identifier, version and validity information. Distinguish standards, programme operator instructions and optional guidance so readers know which framework governs the specific declaration. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. Two products with apparently similar GWP values may use different PCR versions. Translation should flag the methods instead of announcing an unconditional winner. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
28. EN 15804+A1 and +A2
What it means. The +A1 and +A2 amendments identify different reporting frameworks and indicator requirements. A translator cannot make results directly equivalent by substituting modern terminology into an older table. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Calling both systems ‘EN 15804’ without the amendment masks method differences. A translated procurement comparison may then treat unlike impact categories as if they shared the same model. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Carry the exact standard edition and amendment in titles, captions and footnotes. When a crosswalk is needed, identify limitations rather than normalising numbers by guesswork. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. If an older EPD reports one GWP category and a newer one reports disaggregated GWP indicators, the translation should preserve both presentations and note their methodological distinction. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
29. Geography, electricity and baseline
What it means. EPD results can reflect production location, electricity mix, sourcing regions and background database choices. Geography belongs to the modelling evidence, not merely to the postal address of the producer. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Translating a national or regional dataset name into a generic ‘global average’ can change how readers interpret the footprint. Copying results across factories may produce unsupported geographic claims. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Preserve production sites, geographic scope, database versions, cut-off rules and averaging periods when declared. Avoid implying a specific local plant has identical impacts without supporting data. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A supplier operating in several countries may publish a plant-specific EPD or representative average. These are different types of claim, even when the product brand is unchanged. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
30. Validity, publication and verification
What it means. An EPD normally includes registration, programme operator, verification, publication and expiry information. These are evidence and status fields, not decorative lines on a marketing sheet. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. The term ‘third-party verified’ can be inflated into ‘product certified zero-carbon’ or ‘government approved’. Verification of an environmental declaration is not blanket confirmation of all performance claims. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Translate exactly what was verified, by whom and for which period. Preserve registration number, version and availability of the underlying EPD so readers can check the original. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. If a PDF has passed its stated validity date, do not silently call it current. A faithful translation can describe it historically while advising users to check the operator’s latest registration. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
31. Negative values and avoided burdens
What it means. Negative environmental indicator values may arise from method-defined flows, credits or carbon accounting conventions. A minus sign is part of the result, not a standalone guarantee of beneficial performance. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. Removing the sign or switching the label ‘benefit’ into ’emission’ reverses meaning. Equally, marketing may sum negative values from different system boundaries without explaining assumptions. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Check the sign, the indicator, the module and the accounting rule as a single unit. Where the source reports both potential loads and benefits, reflect both rather than highlighting only favourable outcomes. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A negative Module D GWP value does not erase positive A1–A3 or C-stage impacts by default. Any reported net result needs a declared calculation method and comparable boundaries. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
32. Scenario and uncertainty language
What it means. Environmental models make assumptions about lifespan, energy, transport, recycling, waste and future behaviour. An EPD result is evidence within a defined scenario rather than a promise about every project. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. A translator often weakens ‘assumed’ to ‘is’ or strengthens ‘may’ into ‘will’. Such small verbs can convert modelling uncertainty into a claim of actual performance or future recovery. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Preserve qualifying words, scenario IDs and any variability statements. Clarify the difference between primary measurements, supplier data, industry averages and forecast assumptions where described. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A 90% collection rate modelled for end of life does not establish that 90% will actually be collected for one building decades later. Translation should keep the hypothetical status visible. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
33. Technical comparisons and normalisation
What it means. To compare EPDs responsibly, align product function, unit, service life, geographic context, modules, standards and declared scenarios. Normalising one number without all those conditions may generate false precision. The important editorial question is which physical process or reporting convention owns this field, because the same ordinary English word can point to quite different accounting scopes elsewhere in the EPD.
Where a translation fails. An apparently lower carbon result can be a category or boundary artefact rather than a better product. Readers are particularly vulnerable when a translated comparison chart hides footnotes. This is more than an awkward expression: it can alter the interpretation of the declared number and make a careful reader believe that the source supports a comparison it never made.
How to render it faithfully. Include a comparison-conditions box that records the units and boundaries on both sides. If material differences remain unresolved, state that direct comparison is not established. Treat symbols, qualifiers, units and time horizons as part of the sentence. If the preferred target-language term is ambiguous, add a short definition rather than silently removing the source’s qualification.
Worked editorial situation. A kilogram of one adhesive and a square metre of another are not commensurable unless coverage and performance are modelled. Translate the denominator before discussing a ranking. The reader should be able to trace the translated statement back to its original module and assumption. If that trace cannot be made, the translation requires revision before release.
A complete fictional tender exercise
Imagine a public procurement file containing two fictional façade-product EPDs. Product Cedar declares A1–A3 of 75 kg CO₂e per square metre and Module D of −11 kg CO₂e per square metre, with C stages present and A4 not declared. Product Quarry declares A1–A3 of 62 kg CO₂e per square metre, but its sheet specifies a different reference performance and an A4 transport scenario of 6 kg CO₂e per square metre. These figures are invented for teaching. A translation that simply labels Quarry “13 kilograms greener” has skipped the functional comparison, the different module coverage and potential end-of-life effects.
First extract the exact product functions and declared units. Next mark each declared module and its units. Then record service life, installation conditions, relevant PCR and standard version, grid assumptions and scenario definitions. Only comparable fields may be placed side by side with an appropriately limited caption. Do not combine Product Cedar’s D value with its A1–A3 value and compare the result with Product Quarry’s A1–A3 number. Module D answers a different modelling question and remains visibly separate.
For a multilingual client, prepare two translations: an exact technical table preserving all field names and values, and a plain-language explanation that clearly labels any limitation. The caption might read “Product-stage GWP per declared square metre; the two declarations are not yet established as functionally equivalent.” That is less marketable than a one-line winner, but it is more useful to a designer who must make a documented procurement decision.
An editorial sign-off procedure
The author should compare original and translated files line by line. Verify the product name and version, EPD operator and registration, declared unit, standard amendment, all module headings, the indicator method, the exact units, the sign and exponent of every number, and every “not declared” entry. Recalculate only explicitly authorised conversions; never modify environmental model outputs to fit a target locale. Ask a qualified LCA reviewer to assess claims about comparability or regulatory conformity.
A second reviewer should read the target-language version without the original and explain what the declaration does and does not measure. If the reviewer assumes A1–A3 is whole-life carbon, reads Module D as a guaranteed credit, or treats ND as zero, the translation failed its communication test. Correct the wording, not the scientific data. Keep the document’s tables, charts and accessibility descriptions consistent with the text.
Frequently asked questions
Can an EPD be translated without recalculating the LCA?
Yes, a faithful linguistic translation normally preserves the approved values and source methodology. Any changed product, geographic scenario, functional unit, missing module or model assumption must be handled as a technical reassessment rather than disguised as translation. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Is A1–A3 the same as cradle to grave?
No. It represents the product stage, commonly described as cradle to gate. Other life-cycle stages may be present, optional or excluded depending on the applicable reporting rules. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Should Module D always be deducted from the carbon footprint?
No. Module D is a separately reported beyond-boundary effect. A project assessment may have an explicit rule for displaying or aggregating stages, but a translator must not invent that rule. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Is a third-party-verified EPD a zero-carbon certification?
No. Third-party verification supports the declaration under its programme and method. It is not a guarantee of zero impact, universal superiority, safety, durability or regulatory approval. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Can EPDs in different languages be compared using the same number?
Only when the relevant functions, units, standards, scopes and scenarios are sufficiently aligned. Language consistency alone cannot make unlike assessments equivalent. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
What does ND mean?
It means not declared under the table’s convention. It is not a measured zero and must never be used as one in a translated comparison. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Should a translator convert every number to local units?
No. Preserve the original units unless a controlled, reviewed conversion improves accessibility. When conversions are supplied, show the original unit too and check numerical precision. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Who reviews high-stakes procurement translations?
A competent technical translator and an LCA or construction professional should collaborate where environmental performance claims will affect specifications or public procurement. A language review alone is insufficient for engineering conclusions. This answer is deliberately bounded by the particular EPD being translated; if the source document differs, its governing standard, programme rules and declared scenario remain authoritative.
Primary references and further learning
Useful public reference points include the Irish Green Building Council explanation of EPD life-cycle modules, the EPD International example showing declared and non-declared modules, and ISO 21930:2017’s description of construction-product EPD requirements. Consult the exact applicable EN 15804 edition and EPD programme rulebook for compliance decisions.
The practical lesson is simple but demanding: the best translation protects the product’s declared function, the boundaries of every number and the uncertainty of its scenario. Readers should finish knowing what the EPD says, what it omits, and what extra evidence would be necessary before comparing two building products.