How Singapore connects is not only about what gets built.
It is also about how a building proposal moves through many regulatory agencies before construction begins.
Did you know that a single development can involve planning, building control, drainage, transport, fire safety, greenery, environmental health and utility requirements—all describing the same physical project from different regulatory angles?
Traditionally, those requirements created many separate submission touchpoints.
CORENET X is Singapore’s attempt to make that approval network more coordinated.
Instead of each discipline and agency seeing the project in isolation, project teams submit coordinated information through common regulatory gateways.
The building becomes one shared digital model rather than many disconnected plan sets.
This article follows Singapore’s building-approval connection layer: CORENET X, BIM, IFC+SG, Qualified Persons, Design Gateway, Construction Gateway, Completion Gateway, Direct Submission Process and the regulatory agencies that collectively shape a building before it is allowed to exist.
The physical construction layer is explored in How Singapore Connects | Construction Sites, Materials and Urban Growth. Digital twins are explored in How Singapore Connects | Digital Twins, Virtual Singapore and Urban Planning. Here we ask the approval question: how does one proposed building become something multiple agencies can approve coherently?
Did You Know? CORENET X Became Mandatory for New Projects of 5,000 m² and Above on 1 October 2026
The current CORENET X implementation timeline, updated in July 2026, says submission through the CORENET X Gateway Processes is mandatory from 1 October 2026 for new projects with Gross Floor Area of 5,000 m² and above.
New projects below that threshold can continue with CORENET 2 for now, although voluntary CORENET X submission remains available.
That is the current 2026 rule after the government refined the earlier plan to mandate CORENET X for every project.
The Threshold Changed After Industry Feedback
Earlier plans would have made CORENET X mandatory for all new projects regardless of size from 1 October 2026.
BCA and URA later refined the approach after observing that the coordinated gateway process created the greatest benefits for larger, more complex projects.
Projects below 5,000 m² therefore remain voluntary for now.
Large Projects Entered First
From 1 October 2025, new projects with GFA of 30,000 m² and above were already required to use CORENET X.
The October 2026 threshold extends mandatory use to medium-sized projects.
The Old System Had More Than 20 Approval Touchpoints
CORENET X’s current regulatory-process overview says building developments under the earlier approval model could face more than 20 separate approval touchpoints across Development Control and Building Plan stages.
Different agencies responded separately.
Project teams then had to reconcile conflicts between those responses downstream.
The New Model Uses Three Main Gateways
CORENET X restructures the process into:
- Design Gateway;
- Construction Gateway; and
- Completion Gateway.
At each milestone, coordinated submissions are reviewed collectively against multiple agencies’ requirements.
The Design Gateway Tests the Project Early
The Design Gateway focuses on major planning and design parameters before the project becomes too detailed to change cheaply.
The objective is to resolve fundamental cross-agency issues upstream rather than discovering them after construction drawings are nearly complete.
Upstream Coordination Is Cheaper Than Downstream Rework
Move a driveway on a concept model.
Much easier.
Move it after detailed drainage, structure, fire access and landscape plans are complete.
Much harder.
CORENET X is partly a timing strategy: find conflicts when change is still affordable.
The Construction Gateway Tests Buildable Detail
By the Construction Gateway, the project has advanced into coordinated details needed for construction-related approvals.
Architecture, structure and relevant engineering systems are expected to align sufficiently for agencies to review a coherent project.
The Completion Gateway Closes the Regulatory Loop
The Completion Gateway deals with the final compliance and completion stage.
The design that agencies approved must correspond with what was ultimately constructed and documented.
Some Simpler Projects Use the Direct Submission Process
CORENET X’s current process also provides a Direct Submission Process, or DSP, for simpler project typologies that do not need the full three-gateway route.
Examples can include certain single-unit residential works, simple pavilions, linkways and other lower-complexity developments under the applicable criteria.
The Regulatory Process Is Matched to Complexity
A 50-storey mixed-use development and a small standalone structure should not necessarily face identical coordination overhead.
CORENET X increasingly differentiates by scale and complexity.
Did You Know? Seven Major Regulatory Agencies Are Integrated in CORENET X
CORENET X currently supports submissions to:
- BCA;
- URA;
- NParks;
- LTA;
- NEA;
- PUB; and
- SCDF.
HDB and JTC support selected submission types, while additional agencies can be onboarded progressively.
One Building Touches Many Agencies for Good Reasons
URA cares about planning.
BCA cares about building safety and control.
SCDF cares about fire safety.
PUB cares about drainage and water-related systems.
LTA cares about transport interfaces.
NParks cares about greenery and tree impacts.
NEA cares about environmental health.
The building is one object with several public consequences.
The Problem Is Not Multiple Agencies; It Is Uncoordinated Interpretation
Different agencies need different expertise.
The inefficiency appears when each sees a different version of the project or when one requirement conflicts with another too late.
CORENET X Uses a Coordinated BIM Model
BCA’s current BIM guidance says Qualified Persons can submit a single coordinated Building Information Model through CORENET X for regulatory approvals.
The building is represented digitally in three dimensions together with structured project information.
BIM Is More Than a 3D Picture
A Building Information Model can contain:
- geometry;
- spaces;
- building elements;
- discipline information;
- dimensions;
- system relationships; and
- structured attributes.
The model is a shared project database expressed partly through 3D geometry.
IFC+SG Is the OpenBIM Submission Format
CORENET X uses IFC+SG as its openBIM exchange approach for projects subject to BIM requirements.
IFC provides a standard way for different authoring software to exchange building information.
The Singapore extension adds local regulatory data needs.
Open Standards Reduce Software Lock-In
Architect uses one design platform.
Engineer uses another.
Agency uses validation tools.
A common exchange format lets information move between them more reliably.
The Model Must Be Coordinated Before Submission
If the architectural wall cuts through a structural beam, the digital model should reveal it.
If a service riser collides with another system, coordination should happen before agency review or site construction.
The model becomes a conflict-detection environment.
Did You Know? Agencies Review Coordinated Submissions Collectively
CORENET X’s gateway concept is designed so relevant agencies review a coordinated submission at the same milestone instead of issuing isolated responses through many separate touchpoints.
That is the central organisational change.
Qualified Persons Remain Accountable
Digitalisation does not remove professional responsibility.
Architects and professional engineers still act as Qualified Persons for regulated submission areas and make formal declarations where required.
The QP Is the Professional Bridge
Owner wants a building.
Consultants design it.
Agencies regulate it.
The Qualified Person is one of the key accountable professionals translating design into a regulatory submission.
CORENET X Login Connects to Singpass Business
Current onboarding guidance says professional users generally access the Submission Portal through Singpass Business, with Corppass administrators authorising staff to transact for the company.
The building-approval system therefore depends on digital organisational identity.
That Connects to ACRA and Corppass
The corporate-identity layer in How Singapore Connects | ACRA, UEN and Business Registration supplies the entity identity and authorisation chain behind many professional submissions.
The building model has authors.
The digital platform needs to know who they are authorised to represent.
Project Creation Becomes a Digital Container
Before submissions begin, the project is created in the portal.
Team members and QPs are assigned.
Agency-relevant information is attached to one project record.
The project itself becomes an information object.
The Submission Is Not Complete Until Declarations and Payment Are Complete
CORENET X’s current FAQ says a submission is considered successfully made only after the required form and attachments are completed, appointed QPs make their declarations, fees are paid and the submission status changes to Processing.
Clicking upload is not the same as completing the legal submission.
Did You Know? Typical Joint Submissions Have a 20-Working-Day Expected Response Time
CORENET X’s July 2026 FAQ says 20 working days is the expected response time from agencies for joint submissions such as Design Gateway, Construction Gateway and Direct Submission Process for a typical project.
Day 1 generally begins on the next working day after a successful submission enters processing.
Response Time Is Only Useful if the Submission Is Coordinated
A fast rejection of a badly coordinated submission does not save the project.
The objective is to shift effort toward design coordination before formal submission.
The Gateway Creates a Decision Freeze Point
Before a gateway, teams can iterate.
At the gateway, they declare the coordinated state ready for agency review.
The milestone creates discipline inside the project team.
CORENET X Changes Consultant Workflows
Architects cannot design in isolation and hand work downstream indefinitely.
Engineers, landscape architects and other consultants need earlier coordination.
The process pushes collaboration upstream.
That Changes Project Management
Meeting agendas shift.
Information deadlines move earlier.
Model ownership becomes clearer.
Design decisions need to be resolved before submission milestones.
The Platform Can Reduce Repeated Data Entry
When a coordinated model and common project record are reused, teams should not need to reproduce the same information independently for every agency as often as before.
The value lies in shared information.
Machine Validation Can Catch Problems Before Agency Review
IFC+SG resource tools allow project teams to validate model completeness and data structure before formal submission.
Software can catch missing attributes and technical issues that do not require human regulatory judgement.
Human Review Moves Toward Higher-Value Decisions
If software catches basic completeness errors, agency officers and consultants can spend more attention on substantive design issues.
CORENET X Connects to Digital Twins
The same BIM discipline that supports regulatory submission can later support How Singapore Connects | Digital Twins, Virtual Singapore and Urban Planning.
A project model created for approval can become part of a longer information lifecycle.
CORENET X Connects to Construction
Approved information eventually reaches How Singapore Connects | Construction Sites, Materials and Urban Growth.
The digital model becomes drawings, coordinates, quantities and construction instructions on site.
CORENET X Connects to Underground Utilities
PUB, LTA and other agencies may need to coordinate drainage, roads and utility interfaces.
That connects project approval to How Singapore Connects | Underground Utilities, Common Services Tunnels and Utility Ducts.
A building cannot be approved as though the ground around it were empty.
Fire Safety Is Designed into the Approval Process
SCDF requirements affect fire-engine access, compartmentation, escape, hydrants, alarms and other systems.
Those requirements are easier to coordinate early than retrofit after construction.
Drainage Is Designed into the Approval Process
PUB requirements can affect platform levels, drainage, detention, sewer and water-service interfaces.
The building and city water system meet during design.
Transport Is Designed into the Approval Process
Vehicular access, loading, parking and road connections affect surrounding traffic.
LTA review keeps the private development connected to public transport infrastructure.
Greenery Is Designed into the Approval Process
Existing trees, landscape replacement and planting requirements can affect site design.
NParks review connects development intensity with urban greenery.
The Model Can Reveal Cross-Agency Conflicts
A fire-engine route crosses a tree-retention zone.
A drain clashes with a structural element.
A driveway conflicts with pedestrian design.
A coordinated digital model makes these interfaces more visible.
The Biggest Benefit Is Often Conflict Discovered Earlier
The project does not save time because agencies stop regulating.
It saves time when the same conflict is solved once rather than rediscovered repeatedly.
A Small Example: Large Mixed-Use Development
Developer appoints design team.
Team creates coordinated BIM model.
Design Gateway submission reaches multiple agencies.
Cross-agency issues are identified early.
Project team revises one coordinated design.
Construction Gateway later confirms detailed compliance.
The approval process behaves like one network rather than seven queues.
A Small Example: Medium Project in October 2026
New project has GFA of 8,000 m².
Because it begins after 1 October 2026 and exceeds the 5,000 m² threshold, CORENET X Gateway submission is mandatory under the current implementation plan.
The team must organise its design process around the new workflow.
A Small Example: Small Project
New project has GFA of 3,000 m².
Under the July 2026 refinement, CORENET X Gateway submission is not mandatory for now.
The team can continue with CORENET 2 or voluntarily use CORENET X where appropriate.
What Can Break the CORENET X Connection?
- disciplines modelling different versions of the project;
- QP declarations incomplete;
- fees unpaid;
- IFC+SG data missing;
- project submitted before internal coordination;
- teams misunderstanding the current 5,000 m² mandatory threshold;
- Corppass authorisation missing;
- agency comments not resolved consistently across disciplines;
- software export problems; and
- treating BIM as a drawing format instead of a coordination process.
Digital approval works only when the project team is digitally coordinated too.
How to Read CORENET X Like a Systems Thinker
1. Identify the project threshold
Is GFA 5,000 m² or above under the current mandatory rule?
2. Identify the regulatory route
Three Gateways or Direct Submission Process?
3. Identify the agencies
Which statutory requirements apply?
4. Identify the model
Is the BIM coordinated and IFC+SG-ready where required?
5. Identify the professionals
Which QPs and consultants own each discipline?
6. Identify the milestone
Design, Construction or Completion Gateway?
7. Identify unresolved interfaces
What conflict crosses more than one agency or discipline?
The eduKate Singapore Graph: A Building Is Approved as a Network
The building is not only architecture.
It is fire safety, drainage, transport, greenery, structure and environmental health in one place.
CORENET X tries to make the approval process look more like the building itself: coordinated.
Frequently Asked Questions
What is CORENET X?
A digital regulatory submission platform and redesigned approval process led by BCA and URA with public agencies and industry.
What is the current mandatory threshold?
From 1 October 2026, new projects with GFA of 5,000 m² and above must use CORENET X Gateway Processes under the July 2026 implementation update.
What about projects below 5,000 m²?
CORENET X is voluntary for them for now, and CORENET 2 can continue to be used.
What are the three main gateways?
Design Gateway, Construction Gateway and Completion Gateway.
What is DSP?
The Direct Submission Process, a simplified route for eligible lower-complexity project types.
Which agencies are integrated?
CORENET X currently supports BCA, URA, NParks, LTA, NEA, PUB and SCDF, with selected HDB and JTC submission types.
What is IFC+SG?
The openBIM exchange format and Singapore-specific information standard used for applicable CORENET X BIM submissions.
What is the expected response time for a typical joint submission?
CORENET X’s current FAQ states 20 working days.
Who submits?
Project teams and Qualified Persons make the relevant coordinated submissions and professional declarations.
Where can I check the latest implementation timeline?
CORENET X | Implementation Timeline.
Helpful Reading and Singapore Graph Connections
- CORENET X | Official Information Site
- CORENET X | Implementation Timeline
- CORENET X | New Regulatory Approval Process
- BCA | Building Information Modelling
- How Singapore Connects | Construction Sites, Materials and Urban Growth
How Singapore Connects: The Building Gets Coordinated Before Concrete
Did you know the cheapest place to fix a clash is inside the model?
Coordinate.
Validate.
Submit.
Review together.
Resolve early.
Then build.
CORENET X connects agencies before the site has to absorb their differences.