What the BC Act actually does
The Building Control Act 1989 (and its Building Control Regulations) is the master legislation for all building works in Singapore. It establishes:
- Who can carry out building works (only persons with proper approval)
- Who can sign off building works (only registered Qualified Persons — QPs)
- What level of supervision is required during construction
- What happens at completion (TOP, CSC)
- What happens to existing buildings over time (PSI)
- What happens when building works go wrong (enforcement)
Below: the seven sections that property owners actually need to understand.
Section 5 — Approval before construction
"No person shall commence or carry out any building works without the prior written approval of the Commissioner of Building Control."
This is the foundation of the entire regulatory regime. Building Plan approval (or its equivalent for smaller works) must be obtained before works commence. Starting works first and applying for approval later is an offence.
The owner is the person on whom the obligation falls — not the contractor, not the architect. If you allow works to proceed without approval on your property, you bear the legal risk.
Section 9 — Appointment of Qualified Persons (QP)
Every building project requires the appointment of a Qualified Person — typically a registered Architect (QP-Architecture) and a Professional Engineer (QP-Structural). The QP takes legal responsibility for design and supervision in their discipline.
For most projects, the architect leads the BCA submission as principal QP, with the PE acting as QP-S for the structural component. For pure-structural projects (industrial, refurb, certain A&A), the PE may act as principal QP.
The QP must hold current registration with the relevant Board (PEB for Professional Engineers, BOA for Architects) and a valid Practising Certificate.
Section 12 — Site supervision
The QP isn't off the hook once BCA approval is issued. Section 12 requires the QP to provide adequate site supervision during construction to ensure works are carried out in accordance with the approved plans.
For larger projects, the QP appoints supervising staff (Resident Engineers, Resident Technical Officers) under their supervision. For smaller projects, the QP themselves visits site at key stages.
If completed works deviate materially from the approved plans, the QP must either re-submit for amendment or refuse to issue completion certification.
Section 22 — Completion certification (TOP / CSC)
Before a building can be occupied, BCA must issue:
- Temporary Occupation Permit (TOP) — interim approval allowing occupation while final certifications are processed
- Certificate of Statutory Completion (CSC) — final certification confirming the building is complete in accordance with approved plans
The QPs must submit Form C (or equivalent) certifying their respective scope of works are complete and compliant. Without QP sign-off, no TOP or CSC is issued.
Section 28 — Periodic Structural Inspection
Existing buildings must undergo Periodic Structural Inspection (PSI) at intervals set by BCA — every 5 years for non-residential, every 10 years for residential. PSI is conducted by a registered Professional Engineer (Civil) and the structural condition report is lodged with BCA.
The owner is the responsible person for arranging PSI. Missed deadlines attract composition fines and, in severe cases, prosecution. We've covered PSI in detail in our PSI Owner's Guide.
Section 36 — Demolition control
Demolition of a building (or any substantial part of it) requires BCA Demolition Plan approval and PE endorsement of the demolition method. This includes:
- Survey of the existing structure
- Demolition method statement
- Exclusion zone calculation
- Adjacent building protection plan (instrumentation if needed)
- Waste disposal plan
For demolition near MRT lines, LTA Railway Protection clearance is also required (similar to ERSS adjacent to MRT — covered in our LTA RP article).
Section 47 — Enforcement powers
If unauthorised works are carried out (in breach of Section 5), BCA has wide enforcement powers:
- Issue Notice of Contravention
- Order to demolish unauthorised works
- Composition fine (up to SGD 200,000 in serious cases)
- Court prosecution for criminal liability
- Public registry of contravening works (visible to future buyers)
The cure for past unauthorised works is regularisation — retrospective PE endorsement and BCA submission. We've written a separate article on regularising HDB mezzanines.
How the Building Control Regulations (BCR) sit alongside the BC Act
The BCR is subsidiary legislation under the BC Act. It sets out detailed technical and procedural requirements:
- Submission documents and forms
- Fee schedules
- Timelines for approval and resubmission
- Buildability scoring (CONQUAS) requirements
- Energy-efficiency requirements (Green Mark)
- Specific design requirements (loading, fire, accessibility)
Most owner-facing decisions are governed by the BCR, even though the framework comes from the BC Act.
The other authorities you'll encounter
BCA is the lead authority but rarely the only one:
- SCDF — Fire Safety Plan, sprinkler system, escape design
- URA — planning permission, change of use, conservation, GFA
- NEA — environmental, noise, dust, hawker
- PUB — sanitary, drainage, water supply
- LTA — Railway Protection if near MRT, road occupation
- JTC — for industrial estate properties
- HDB — for HDB properties (MA approval)
- MOM — Workplace Safety and Health Act for active sites
- SLA — for state land issues
- PEB — registration of Professional Engineers
- BOA — registration of Architects
From 1 October 2026, CORENET-X integrates the multi-authority review into a single platform. We've covered CORENET-X in detail separately.
What every owner should do
- Keep all BCA approval letters and approved drawings on file. These are your asset paperwork; treat them as importantly as your title deed.
- Before any renovation, confirm with a PE whether PE endorsement is required. Don't rely solely on the contractor.
- If you receive a BCA notice (PSI due, enforcement, or otherwise), respond promptly. The fines compound.
- Before buying, run a pre-purchase check against BCA records. Don't inherit somebody else's compliance problem.
- Before selling, run a pre-listing check. Negotiate from a clean file.
If you have a Building Control Act question — about your existing property, a planned renovation, or a compliance notice from BCA — send the details to CVC Engineers. We'll respond within one working day.