An as-built submission in Singapore is the set of plans, certifications and supporting records that document a building as it was actually constructed, lodged with the relevant authority once works are complete. Its content and timing depend on the agency and the type of work. For a building that needs a Temporary Occupation Permit (TOP) or Certificate of Statutory Completion (CSC), as-built plans form part of the documentation reviewed by the Building and Construction Authority (BCA). For HDB civil and structural works, the Qualified Person (QP) must submit digitally signed as-built plans when all such works are completed. This article sets out who prepares the submission, what it contains, how it is lodged, and where projects most often lose time.
TL;DR
- A TOP or CSC is required to occupy a building, or part of one, after building works; as-built plans and test reports are among the documents relevant to that application.
- For HDB civil and structural works, the QP submits digitally signed as-built plans on completion of all such works, with the Accredited Checker (AC) also signing where required. Piling plans are due within 28 days of completing piling works.
- Immaterial structural deviations are documented through record plans certified by the QP (Design), not left unrecorded.
- Under CORENET X, the Completion Gateway is the channel for TOP/CSC applications and for documenting as-built plans.
- CSC depends on clearances from every relevant technical agency, so as-built records must be consistent across disciplines before the application is filed.
Table of Contents
- What an as-built submission is and when it applies
- Who is responsible for preparing and certifying the submission
- Documents an as-built submission must contain
- How as-built plans are lodged: CORENET and CORENET X
- Differences by agency and type of work
- Timing: what to submit before the TOP application
- Common causes of incomplete or rejected as-built submissions
- Perspective: where as-built submissions are decided
- How Aman supports as-built and completion submissions
- FAQ
- Sources
What an as-built submission is and when it applies
An as-built submission is a formal statement that the completed works are recorded accurately. It is distinct from the approved design. Approved plans describe what the project team intended to build under the permit; as-built plans describe what was delivered, including every departure from the approved set that occurred during construction.
The requirement arises at the end of the construction cycle. BCA states that a TOP or CSC is required to occupy a building or part of a building after building works have been carried out. The application is supported by as-built plans, test reports and certification forms, and it cannot be treated as complete until those records are in order.
The following project types commonly trigger as-built documentation:
- New buildings, including residential, commercial and industrial developments.
- Additions and alterations where structural, architectural or services works change the approved layout.
- Structural works carried out under a structural permit, where the built condition departs from the approved structural plans.
- HDB projects and works within HDB premises, where HDB’s own plan submission guidelines govern the civil and structural portion.
- Works with environmental sustainability obligations, where the relevant as-built submission must be in place before a TOP or CSC application is considered.
The project type does not remove the obligation. It changes which agency receives the records, which forms apply and which professionals sign them.
Who is responsible for preparing and certifying the submission
Responsibility in Singapore’s regulatory framework attaches to named professionals, not to the project in general. The following roles recur across as-built submissions.
| Role | Responsibility in the as-built stage |
|---|---|
| Qualified Person (QP) | Prepares and submits as-built plans for the relevant discipline, applies a digital signature and certifies supervision of the works |
| Accredited Checker (AC) | Signs the as-built plans where the project category requires an independent check, and provides AC calculations where applicable |
| QP (Architect) appointed for supervision | Attends BCA’s TOP inspections to address queries and to note any recorded non-compliances |
| QP (Design) | Certifies that immaterial structural departures do not affect structural adequacy or stability, and submits record plans |
| Developer or owner | Appoints the professionals, secures agency clearances and files the TOP or CSC application |
For HDB civil and structural works, the HDB guidelines on civil and structural plan submission provide that the QP submits digitally signed as-built plans when all civil and structural works are completed, and the AC also signs them if required.
The supervision duty carries particular weight. BCA’s TOP/CSC portal describes TOP and CSC inspections as audits that verify the building was constructed in accordance with the approved plans. The QP (Architect) appointed for supervision must be present on site during these inspections to address queries and to note recorded non-compliances. An as-built submission that does not match site conditions is therefore exposed at the inspection, not only at document review.
Documents an as-built submission must contain
The exact checklist depends on the agency and discipline. The following items are confirmed in official guidance.
BCA TOP and CSC documentation
BCA’s TOP/CSC application page lists the required as-built documentation as as-built plans, test reports and various certification forms. Two forms named there are the Certificate of Supervision of Building Works (Form BCA-CSC-CSPBW) and the Declaration by Qualified Person (Form BCA-CSC-TOPCSCDQP). Project teams should confirm the current form set on the BCA page at the time of filing, because forms are revised periodically.
HDB civil and structural as-built submissions
The HDB guidelines require the following for civil and structural as-built submissions:
- Digitally signed PDF as-built plans.
- Form HDB(C&S)-QPAPP01.
- Supplementary amended design calculations, where the as-built condition changes the design basis.
- AC and Accredited Checker Organisation (ACO) calculations, if applicable.
Piling is treated separately: piling plans are due within 28 days of completion of piling works, which is earlier than the general as-built deadline. A project team that plans only for the final as-built date will miss this earlier obligation.
Environmental sustainability as-built submission
The ES Online Portal, which operates under the Building Control (Environmental Sustainability) Regulations 2008, states that the ES02 as-built submission, including the relevant templates where there are deviations from the last submitted templates, is required before a TOP or CSC application can be considered. The consequence is practical: the ES02 record must reflect the built condition of the envelope, systems and equipment, and any change from the earlier templates must be reflected in the templates themselves. Teams that handle handover documentation for sites with prior demolition or strip-out works will find a useful parallel in this commercial site handover compliance guide, which treats the discipline of documenting what changed against what was previously recorded.
Record plans for immaterial structural deviations
Structural departures during construction are common, and not all of them require a revised permit. BCA’s page on record structural plans provides that, for immaterial departures or deviations, the QP (Design) must submit record plans and certify that they do not affect the building’s structural adequacy or stability. The QP’s judgment on materiality must be defensible, since the certification is a professional statement. Departures that are material need a different route, and the project’s structural engineer should determine this before the as-built stage rather than after it.
How as-built plans are lodged: CORENET and CORENET X
Singapore’s regulatory submissions are channelled through the CORENET systems. Under the new process, CORENET X organizes the regulatory process into three gateways: Design, Construction and Completion. The Completion Gateway is the gateway for TOP/CSC applications and for documenting as-built plans.
Three points follow for project teams.
- As-built documentation is part of the same gateway as the occupation application. It should be planned together, not treated as a separate administrative task after TOP.
- The digital model and drawing set submitted in earlier gateways form the baseline against which the built condition is recorded. Discrepancies that were never updated during construction appear at this stage.
- Project teams should check the current CORENET X guidance for which project categories and sizes are on the new process, since applicability has been phased in. Our guide to CORENET X requirements for larger projects covers the checklist for projects above 5,000 sqm.
For teams that need the mechanics of electronic lodgement, the how to submit BCA plans guide describes the practical sequence.
Differences by agency and type of work
As-built obligations are not uniform. Three sources of variation matter most.
Agency. HDB sets its own guidelines for civil and structural work, including the 28-day piling deadline and the specific form reference above. BCA governs the TOP/CSC process and the structural permit regime. Other agencies apply their own requirements for their respective scope.
Clearances for CSC. BCA states that a CSC is issued only when a development has complied with all statutory requirements and obtained all necessary clearances from relevant technical agencies. Depending on the project type, these include PUB, NEA, FSSD, LTA, NParks and URA. A project’s as-built records must therefore be coherent across drainage, fire safety, road works, landscaping and planning conditions, because each agency reviews its own portion.
Building type. A landed house, a shophouse, an industrial building and an infrastructure project each draw a different combination of clearances. A mezzanine addition in an industrial unit, for example, involves a different agency set from a new residential block. Our guide to mezzanine authority submissions illustrates how the multi-agency pattern changes for one such scope.
| Aspect | HDB civil and structural | BCA TOP/CSC | ES02 |
|---|---|---|---|
| Trigger | Completion of all civil and structural works | Application to occupy after building works | Required before TOP/CSC application is considered |
| Signatories | QP, with AC where required | QP and other professionals through certification forms | As set out in the ES process |
| Notable deadline | Piling plans within 28 days of piling completion | Processing times stated by BCA once requirements are met | Before the TOP/CSC application |
| Format | Digitally signed PDF plans and Form HDB(C&S)-QPAPP01 | As-built plans, test reports and certification forms | ES02 submission and templates |
Timing: what to submit before the TOP application
The as-built record should not be assembled in the final weeks. BCA states that TOP applications are processed within 7 working days, and that Express TOP applications may be processed within 1 working day, in both cases subject to meeting all requirements and payment. The processing period begins only when the file is complete, so it offers no relief to a team whose as-built plans are still being revised.
Buildability scores are a related item. CORENET guidance on buildability requirements states that project teams are strongly encouraged to submit as-built B-score and C-score for clearance before the TOP application, for example two months ahead, so that TOP can be issued on time. Our note on aligning BS01 and BS03 for the buildability score explains where the submitted figures and the built condition tend to diverge.
A workable sequence for most projects:
- Reconcile drawings during construction. Maintain a marked-up set as works proceed, and record every departure when it occurs.
- Classify departures. The QP (Design) decides which are immaterial and which require a revised submission or approval.
- Submit the early items. Piling plans for HDB works fall due within 28 days, and buildability as-built scores should be cleared well ahead of TOP.
- Complete environmental sustainability records. Confirm the ES02 submission and templates reflect the built condition.
- Obtain technical agency clearances. Track each agency’s requirements separately.
- Finalize digitally signed as-built plans and certification forms. Confirm the QP and AC signatures are in place.
- File the TOP or CSC application through the Completion Gateway. Ensure the QP (Architect) is available for the inspection.
The broader timeline for approvals is covered in our realistic timeline for BCA building plan clearance.
Common causes of incomplete or rejected as-built submissions
The official sources cited above do not publish a rejection rate, so the following reflects the points at which the stated requirements are most easily missed.
- Plans that do not match the site. Because TOP/CSC inspections audit the building against approved plans, any unrecorded departure becomes a recorded non-compliance.
- Missing signatures. HDB requires digitally signed plans, and the AC signature where applicable. An unsigned file is an incomplete file.
- Calculations not updated. Where the as-built condition alters the design, supplementary amended calculations are part of the submission.
- Earlier deadlines overlooked. Piling plans fall due before the general as-built deadline.
- ES02 templates not updated. Deviations from the last submitted templates must be reflected before TOP/CSC is considered.
- Outstanding agency clearances. CSC cannot be issued while any technical agency clearance is pending.
- Unavailable supervising QP. The QP (Architect) must attend BCA’s inspections.
When a submission is returned, the correction route follows the same channel: revise the affected plans or forms, obtain the signatures again, and resubmit through the gateway. Structural comments in particular are addressed in our guide to common reasons for BCA structural submission rejections.
Perspective: where as-built submissions are decided
We treat the as-built submission as the last step of a process that begins at design, not as a clerical task at handover. In our statutory submission work across BCA, URA, HDB, SCDF, PUB and LTA, the files that clear without repeated amendments are those where one party coordinates the disciplines and keeps the record current throughout construction. That is why we offer single-point statutory coordination, supported by a multidisciplinary PE team and BIM coordination, and why we report a 99% authority clearance rate.
Our view is specific. First, the QP’s materiality decision on a structural departure should be made at the time of the departure, with the evidence of the site condition recorded then. Second, as-built information from structural, façade, M&E and fire safety disciplines should be checked against each other before any agency sees it, since each agency reads only its own portion and an inconsistency surfaces at the weakest point. Third, where drone-assisted inspection is useful for verifying the built condition of façades and roofs, it should be used early enough for findings to be reflected in the record.
— Aman
How Aman supports as-built and completion submissions
Aman Engineering Consultancy coordinates authority approvals for property developers, construction firms and building owners, including structural, façade, fire safety and M&E submissions, PE endorsements and inspection-based certification. Teams approaching completion can engage us to reconcile as-built records across disciplines, prepare the signed submissions and manage the sequence of agency clearances.
Details of the services are on our authority approvals page, and the full list is on the Aman Engineering Consultancy home page. For the wider submission framework, see our complete guide to BCA submissions.
FAQ
Who signs an as-built submission in Singapore?
The Qualified Person signs the as-built plans digitally. For HDB civil and structural works, the Accredited Checker also signs where required. Certification forms for BCA, such as the Declaration by Qualified Person, are completed by the relevant professionals.
When is the as-built submission due?
For HDB civil and structural works, it is due when all such works are completed. Piling plans are due within 28 days of completing piling works. For BCA purposes, the records must be in order before the TOP or CSC application, and the ES02 as-built submission is required before that application is considered.
Do small structural deviations need a new approval?
Not necessarily. For immaterial departures, the QP (Design) submits record plans and certifies that they do not affect structural adequacy or stability. Whether a departure is immaterial is a professional determination that should be made by the structural engineer.
How long does BCA take to process a TOP application?
BCA states that TOP applications are processed within 7 working days, and Express TOP applications may be processed within 1 working day, subject to all requirements being met and payment made. The period does not cover the preparation of as-built documents.
Where are as-built plans lodged under CORENET X?
They are documented through the Completion Gateway, which is also the gateway for TOP/CSC applications.
Sources
- Application for TOP/CSC, Building and Construction Authority
- Guidelines on Civil and Structural Plan Submission, HDB
- BCA TOP/CSC Portal
- Buildability requirements and submissions, CORENET
- ES Online Portal, Building Control (Environmental Sustainability) Regulations 2008
- Record Structural Plan (C-Forms), BCA
- CORENET X three gateway process