Before hacking or altering an HDB wall in 2027, get HDB’s prior written approval for the proposed work. HDB says even partial wall demolition needs approval. Engage a renovation contractor listed in the Directory of Renovation Contractors, and use the official guidelines for the exact work rather than guessing from the wall’s appearance or a drawing.
Decide what the new layout needs to achieve before paying for work that depends on an approval. Ask the contractor to show the walls, services and changes on a marked plan, explain what can proceed and identify the requirements for any specialist work. If approval is pending or the approved scope changes, keep that part of the work out of the start schedule until it has been resolved.
- Require written HDB approval before wall hacking or demolition.
- Check the exact flat and plan with a contractor listed in HDB’s directory.
- Verify separate rules for building, electrical, plumbing, gas and window works.
- Keep the approved scope, schedule and contractor instructions aligned.
- Have a workable layout if an opening or wall change cannot proceed.
Find the section you need
Jump to the approval check, planning and quote, work sequencing or alternatives for a wall that needs to remain.
Can you hack an HDB wall? · How to check the contractor and the quote · What to do if the work differs from the plan · Frequently asked questions about hacking HDB walls
Chapters 1–3 · What needs approval, design and contracting
Chapters 4–7 · Permit, work changes, a worked example and FAQs
HDB’s renovation guidance says all demolition and hacking of walls, including partial work, requires prior written approval. HDB uses this process to protect structural integrity and public safety. Even when a contractor believes an element is non-load-bearing, verify the applicable conditions and approved scope before anyone starts work. A contractor’s view can help prepare the application. Written HDB approval is the relevant milestone for proceeding with the approved wall work.
Do not use a visual shortcut to decide
A wall’s material, thickness, sound or appearance is insufficient to establish that it can safely be altered. A plan can show features that warrant attention, but it needs to be read for the exact flat and work. Ask the contractor to obtain and use the relevant documentation and follow HDB’s requirements. If a proposal involves structural questions, use the process and professional input HDB requires. Keep columns, beams and other structural elements out of assumptions about what can be removed.
HDB publishes detailed guidelines on types of wall demolition and erection. Some partition work may not require a permit when it meets the applicable conditions, such as requirements concerning lighting, ventilation and a direct escape route. Check the exact proposal. Approval requirements for one part of a renovation can differ from the conditions that apply to another part. A room created by a partition still has to function safely and comply with the relevant guidance.
Confirm what the designer and builder will do
Ask the contractor to mark the specific portion of wall on the plan and write what will be removed, retained or changed. Read the marked plan alongside the quotation. If the language is unclear, ask for a precise description before paying for related work or ordering furniture. A phrase such as opening up the kitchen could cover several very different proposals with different requirements.
Keep demolition separate from the fitting or finishing work that follows. A kitchen design may be possible with the wall in place, while one custom unit may depend on the opening. Give those items different start conditions. That makes it easier to continue permitted work elsewhere if an approval or redesign takes time.
| Proposed work | First check |
|---|---|
| Remove all or part of a wall | HDB prior written approval and the exact approved scope |
| Create or change a partition | HDB guidelines for the specific type, use and conditions |
| Move electrical, plumbing, gas or window items | Applicable work guidelines and licensed or approved specialist |
| Change a plan after approval | Confirm whether revised approval is required before proceeding |
Begin with what the household needs. It may be more light, a wider route, a quiet place to work, better kitchen storage or a way to supervise children while preparing meals. Write the need in a sentence. Then ask for at least one layout that achieves the main goal with the wall remaining. Compare that with the layout that needs approval.
Measure the people and objects using the space
Record table, cabinet and door dimensions and the space needed to walk around them. A door that opens into the route can make a large area feel narrow. A table shifted slightly might solve a circulation problem without altering the wall. Consider how the room changes when chairs are pulled out, groceries are put down or a visitor needs more room to move.
Check what the intended change would do to privacy, sound, air movement and storage. Opening up a room can make conversation easier while reducing the ability to work quietly. A family expecting to use the home for several years should test the proposed plan against ordinary routines and at least one foreseeable change. An arrangement can improve the first impression of the room and make the weekday less convenient.
Use a plan that shows the dependencies
Give each drawing a date and version. Mark the wall or opening that needs approval, nearby fittings and the furniture or service layout that depends on it. Ask which jobs can be priced firmly now and which should wait. If the layout includes new wiring or plumbing, confirm the separate requirements and specialists. A clear plan helps the contractor and owner know exactly which changes are being discussed.
Choose a fallback that you would be willing to live with. It could use different furniture positions or storage with fewer alterations. Do not assume any alternative building work is permitted simply because it avoids the first wall. Check its own rules and dimensions. The goal is an acceptable design even when a proposed opening cannot proceed.
Check how the room works if the wall remains
On a copy of the plan, mark the daily routes between the kitchen, dining area, bathroom and entrance. Add the most-used furniture, including clearance around a chair and space to open storage. Try arranging the dining area in a different orientation before assuming the only way to improve circulation is to remove a wall. Keep furniture solutions separate from proposals that involve building work.
Think through a busy evening rather than a staged photograph. One adult might be preparing food, another taking a call and a child moving between the dining and living areas. If the opening helps one person and makes another routine harder, ask whether a different arrangement would solve both. A design can save a renovation step while improving ordinary use. It can also show that the proposed alteration is worth pursuing through the correct approval process.
Make the fallback specific enough to price. Give it dimensions and identify what the contractor would still install. Ask whether the change has any separate conditions. When the quote and date are available for both plans, compare the cost and convenience of the approved proposal with an alternative that can serve the household if the work cannot proceed.
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HDB requires a contractor listed in its Directory of Renovation Contractors for HDB renovation work, including work that does not require approval. Verify the actual company doing the work through the official directory. Ask who will manage the job and who will carry out any work requiring an appropriate licence or approval. The company you talk to at a showroom and the party responsible for site work need to be clear in the agreement.
Separate quote items by task
Request a written scope for demolition, protection, disposal, reinstatement, finishes and any associated specialist work where relevant. Ask which items depend on approval and what would happen to the price if they are changed or removed from the job. A lump sum can conceal a dependency. An itemised quote helps the household see which work is still needed under its fallback layout.
Check the payment schedule and the evidence for each milestone. Ask who will apply for the permit, which documents will be supplied to you and who will confirm that work can start. For electrical, gas, plumbing and window work, refer to HDB’s list of appropriate licensed or approved specialists. Ask which part of the quote their work covers.
Plan changes before ordering dependent items
If custom cabinets or other fittings depend on a wall being removed, check when the final measurement can be made and how changes affect the order. A package that assumes a particular opening could create costs if the approved design differs. Ask for the price and time for a revision before agreeing to a large dependent payment.
Record the way the contractor will communicate a change. A written instruction should describe the work, affected drawing, price and schedule, and any approval needed. Do not treat a conversation on site as permission to enlarge the scope. Give the contractor a clear person to contact when something differs from the plan.
Reconcile the quote with the actual approved scope
A designer’s drawing may show the result the household wants, while the approval and contractor documents define the work that may be done. Ask for a versioned quote and the marked plan it refers to. If a job includes changes to more than one wall or service, have the contractor describe each separately. Write down which approval or specialist check controls each item. This makes it possible to remove or redesign one item without changing the rest by accident.
Suppose a quote includes demolition, removal of debris, work on an adjacent surface and new storage measured to fit the altered area. If the wall change cannot proceed, some of those items may disappear and others may need a different scope. Ask for the corresponding cost, schedule and any charges that would remain. Keep any custom order off the schedule until the plan can be measured against the work that may actually proceed.
Review who will supervise the relevant works and how the current documents reach the site. A listing in the directory is a check on the company. The approved scope and competent people are still needed at the property. Keep a contact for changes, inspections and the owner’s instructions.
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Use HDB’s application guidance for the works proposed. Check the permit or written approval and any conditions that apply. Review the exact area, scope and permitted times. Arrange the renovation schedule so that work needing approval starts only after the proper authorisation is in place. Keep a copy available for the people managing the site.
Compare the approved plan and final quote side by side
Check each wall change against the description in the approval. If something is shown on the sales drawing but not covered by the approval, ask the contractor and HDB how to resolve it before work begins. Make sure the site team has the correct version. A buyer may have several drawings from earlier conversations. Label which one is approved for the relevant work and which one is only a design option.
Review how the site will be used. Confirm the date, hours, waste arrangements and building requirements. Ask who will handle any notices or coordination. Check where the household will stay if essential rooms are unavailable. This turns a general expected start date into a schedule the owner and contractor can actually follow.
Keep defects and renovation records separate
For a new flat, inspect and report relevant original defects before renovations as HDB advises. Preserve the condition record and keep areas available for inspection where needed. For a resale flat, ask about known alterations and relevant records. Make a simple list of visible conditions before work so changes can be described accurately later.
Separate the condition of an existing fitting from the proposal to change it. A defect may require assessment, while an alteration may require different documentation or permission. Keeping the two records apart helps you arrange the right next step when both affect the same room.
Confirm the start meeting with the people doing the work
Before anyone enters the site to begin work, ask the contractor to walk through the current drawing and explain the first tasks. Confirm where equipment and materials will be kept and whether there are areas that must remain untouched. Check that the drawing used by the team matches the relevant approval and conditions. If workers have only an earlier sketch, resolve that before they start.
Ask how the contractor will confirm completion of each stage. Keep any check or inspection information that applies to the project. If the household needs access for a delivery or wants to inspect an item, arrange it safely with the person responsible. Do not enter an active work area without authorisation. An agreed schedule helps the household keep track of progress without interrupting the work or losing sight of a required check.
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If the team finds a condition that changes what it proposes to do, have the contractor stop the affected work and confirm the correct process before proceeding. Record what was found and which part of the scope is affected. Check whether a revised plan, professional input or new approval is required. The appropriate decision depends on the situation and HDB’s requirements.
Keep the change understandable
Ask for a marked drawing and a short description of the revised work. Put the cost, time and approval question next to it. If the change affects another trade, identify which work should pause. For example, a new cabinet measurement may depend on the final approved position of an opening. A revision to one room can also alter electrical or plumbing plans.
Do not direct workers to improvise outside the approved scope. If something appears unsafe, keep people away from the affected area and seek appropriate assistance. Leave assessment of structure and services to the responsible professionals. The owner can make a helpful record of what was observed without attempting to determine the technical cause.
Decide whether the fallback works better
If the change would lead to a delay or larger cost, compare the layout that retains the wall. Measure it again against the household’s actual needs. If it solves the main problem, ask the contractor for the revised price and schedule, including which work is no longer necessary. Verify the requirements for the new plan before work proceeds.
Give the household time to review the practical difference. An earlier move may matter more than a particular opening, or a safe approved change may still be worthwhile. The choice should be based on the current information and lawful scope, with clear instructions for the people doing the job.
Use a short stop-and-check note when something changes
Record the date, the affected location and what differs from the approved plan. Give the contractor the drawing reference and keep the observation factual. Ask what work can continue independently and which part should wait. If more input is needed, record who is seeking it and what confirmation will allow the affected work to resume.
Consider whether the change affects a door, escape route, lighting or ventilation in a way the earlier design did not. These are questions for the responsible contractor and professionals under the relevant requirements. Keep the owner’s preference separate from the technical or approval decision. Once the issue is resolved, distribute the updated instruction and take the older one out of use so it cannot be followed accidentally.
Do the same after the work. Record what was completed, which documents apply and any item to follow up. Ask for relevant approved drawings or other records to retain. They can be useful for later repairs or a future sale when someone needs to understand what changed in the flat.
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A family buys a resale flat and wants more room for meals and a better connection between the kitchen and dining area. Its first design assumes part of a wall can be removed. The listed renovation contractor marks the exact proposal and explains the approval step. The family measures its dining table and asks for a version with the wall in place.
Keep the cost comparison specific
In the first version, some cabinets and finishing work depend on the opening. In the second, the family relocates a table and uses different storage, while keeping most of the same kitchen work. The quote separates wall work from the cabinet, finishing and specialist items that can be planned independently. The family agrees to confirm any required approval before placing orders that depend on the final measurements.
The family also checks whether the two layouts change the move date. If the wall work cannot proceed, the alternative still serves daily meals and leaves a better route to the living room. If approval is obtained for a defined scope, the family can compare that actual layout with the alternative. It no longer has to decide using a drawing that assumes too much.
Write the handover and change rules into the plan
The household and contractor identify who confirms the approved drawings, who tells the site team which work can begin and what happens if something differs on site. The family keeps the approval and quotation together. It retains a separate record of any defects or existing finishes that will be affected.
At the end, the family checks the work against the agreed scope and collects the relevant records. The exact work may differ from its first sketch. The useful outcome is a home that serves the original need, with the actual changes documented and carried out under the applicable rules.
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Does removing only a small portion require approval?
HDB says prior written approval is required for partial as well as complete demolition or hacking of walls. Check the exact proposal with HDB and the listed contractor.
Can a contractor tell from a photo whether a wall is safe to remove?
Use the proper plans, official guidelines and professional process for the proposed work. A photo can help identify a question. It cannot replace the assessment or written approval required.
Do all new partitions need a permit?
HDB lists different conditions for different building works, including some partitions that do not require a permit if conditions are met. Check the type, intended use and the current requirements.
Can I start a different room while a permit is pending?
Check the scope and requirements for that other work. Keep it separate from anything that would affect the pending wall work, safe access or required assessment. Ask the contractor and HDB if the sequence is unclear.
What should I keep before work begins?
- Current plan showing the exact work and its dependencies.
- Verified listed contractor and appropriate specialists.
- Required approval and its conditions.
- Written quote, change process and schedule.
- A workable design if the requested alteration cannot proceed.
Review the approved scope with the people who will actually carry it out. An accurate plan is useful only if the team knows which version and conditions apply at the property.
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