Unauthorised Building Works in Singapore: Penalties, Detection and How to Regularise

Unauthorised building works sit quietly in many Singapore properties: a wall removed during a renovation years ago, a steel mezzanine added to a warehouse unit, an enclosed balcony, a roof extension over a back yard, an extra opening punched through a slab for a staircase. They are often invisible in daily use. They become very visible when a building is sold, leased, inspected, insured, or when something fails.

The law treats these works seriously. Building works without approved plans or a permit, fire safety works without SCDF approval, and development without planning permission each carry maximum fines of S$200,000, and continuing offences attract daily fines.²¹⁰⁷ More important for most owners is the practical consequence: the authorities can order works to stop, be altered, or be demolished, at the owner’s cost.⁴

This guide explains what counts as unauthorised, how such works surface, the penalties under each statute, and the regularisation process: the survey, structural assessment, retrospective submissions and rectification needed to bring a building back into compliance. It ends with common patterns and a due diligence checklist for buyers and tenants.

What counts as unauthorised building works

Three regulators, three different questions

“Unauthorised” is not one test. A single alteration can need approval from several agencies, each asking a different question.

The Building Control Act defines “building works” widely: erection, extension or demolition of a building; alteration, addition or repair; and the provision or alteration of air-conditioning or ventilation systems, including fixed installation works.¹⁹ “Structural works” are works in relation to the structural elements of the building works.¹⁹

What does not need BCA plan submission

The Building Control Regulations list “insignificant building works” in their First Schedule. These do not need plan submission to BCA.¹ The list has changed over time, so check the current First Schedule rather than relying on a contractor’s recollection. Even for exempt works, BCA reminds owners to check whether other authorities (for example URA) must clear the works, and to observe caveats and MCST by-laws.¹

The most common misunderstanding is that “no BCA submission” means “no approval needed at all”. It does not. A non-structural partition may not need BCA plans but may affect fire compartments or escape routes, which is SCDF’s concern. See fire safety approvals for fit-outs and the approval navigator.

Offences and penalties

Building Control Act

Section 19 gives the Commissioner power to order works halted, the building demolished, or alterations made to bring it into compliance, at the cost of the person served. For a completed building, the order is served on the owner or occupier; for works in progress, on the developer or builder. If the order is ignored, the Commissioner may do the work and recover the cost.⁴

Fire Safety Act

Carrying out fire safety works without first obtaining SCDF approval is an offence under section 56 of the Fire Safety Act 1993, punishable by a fine of up to S$200,000, imprisonment of up to 2 years, or both, with a further fine of up to S$1,000 a day if the offence continues after conviction. Failing to apply for a change of use of premises (section 61) carries the same maximum.¹⁰ Failing to obtain a Fire Safety Certificate where one is required has been reported to carry a fine of up to S$10,000.¹¹

Planning Act

Development without planning permission, works in a conservation area without conservation permission, and subdivision without permission are offences under section 12. A first offence carries a fine of up to S$200,000, with up to S$10,000 a day if it continues after conviction; repeat offenders face up to S$200,000, 12 months’ imprisonment, or both. Where the contravention involves demolition in a conservation area, the maximum rises to S$500,000, 12 months, or both.⁷

Two further provisions matter to landlords. Under section 12A, an owner is presumed to have permitted unauthorised development carried out by a tenant or contractor, unless the owner proves reasonable precautions or due diligence.⁸ Under section 28, URA may serve an enforcement notice requiring buildings or works to be altered, demolished or removed, or a use stopped, with at least 14 days before it takes effect.⁹

How unauthorised works surface

Periodic structural inspections

Under the Building Control (Periodic Inspection of Buildings and Building Façades) Regulations 2021, the structural engineer carrying out a periodic structural inspection (PSI) must personally survey the condition of the building, the loading on the structure, and “evidence of any structural works” carried out without prior approval of plans.¹³ PSI is required every 5 years for non-residential buildings and every 10 years for residential buildings, with landed houses used exclusively for residence exempt.¹⁴ An engineer who finds unapproved structural works must report them. See the PSI owner’s guide.

Periodic façade inspections

The periodic façade inspection (PFI) regime, in force since 1 January 2022, covers buildings more than 13 metres tall once they are over 20 years old, every seven years.¹⁵ A competent person inspecting the façade will see enclosed balconies, added canopies, ledge enclosures and new external fixings. Many exterior items, including awnings, shading devices, signboards installed for more than 36 months and brackets for externally mounted equipment, are prescribed “exterior features” with maintenance obligations.¹⁸ Check scope with the PFI checker and the PFI guide.

Sale, purchase and leasing

Conveyancing searches only go so far. BCA states that a legal search by a conveyancing lawyer will only yield unauthorised works that have been brought to BCA’s attention and does not guarantee there are none. BCA recommends that buyers engage a competent person such as an architect or engineer to inspect the property against the approved plans, which can be bought from BCA through its Plan Purchase Application Form.¹

Insurance claims, incidents and complaints

After a leak, fire, collapse or injury, loss adjusters and investigators ask whether the affected part was approved. Neighbours’ complaints and feedback to agencies also prompt inspections; in the Desker Road case described below, URA inspected after receiving feedback.¹² For new properties, works done without approvals can delay the Certificate of Statutory Completion.¹

New A&A works

When an owner later applies for approval of new alterations, the QP surveys the existing building. Unapproved earlier works become the new QP’s problem, because QPs must notify the Commissioner of contraventions they know of or ought reasonably to know of.²⁰ The developer commissioning the new works carries a parallel duty to notify the Commissioner of contraventions it knows of or ought reasonably to know of.⁶ Many regularisations begin this way. See which approvals A&A works need.

Two sourced public events

The regularisation process

Regularisation means bringing unauthorised works into compliance: obtaining retrospective approval where the works can comply, modifying them until they do, or removing them and reinstating the approved condition.

Keep, modify or remove

Cost drivers

There is no standard price for regularisation, and any figure quoted before investigation is a guess. The main drivers are:

• Information gap. Missing original drawings mean more survey and testing.
• Access and disruption. Opening up finishes in an occupied unit costs time and reinstatement.
• Structural outcome. Whether the element passes as built, needs strengthening, or must be removed is the single largest variable.
• Number of regulators. Each additional agency adds submissions, fees and time.
• Authority penalties. A pecuniary penalty under section 21 is calculated by reference to plan fees.³
• Business interruption. Lost use of space, overrun on a lease, or delayed sale often exceeds the construction cost. For tenants near lease expiry, see the late-handback cost calculator.

Illustrative example: a tenant discovers a 40 m² steel mezzanine in a leased unit two months before handback. Survey and assessment take three weeks; the engineer concludes connections are inadequate and recommends removal rather than strengthening. If removal and reinstatement push handback back one month at a rent of S$15,000 a month, holding-over costs alone can rival the removal works. Illustrative figures only; actual outcomes depend on the lease and the findings.

Common patterns (composite scenarios)

The scenarios below are composites drawn from common situations, not specific incidents.

Removed or shortened walls

Composite scenario. A previous owner removed a wall between kitchen and living area to create an open plan. It was a load-bearing wall, or a wall that braced the structure. Ten years later, the new owner applies to add a skylight and the QP’s survey flags the missing wall. Regularisation means confirming whether the wall was structural, designing a beam or frame to replace it, and submitting plans. See hacking walls, slabs and household shelters for walls that must never be touched, such as household shelter walls.

Mezzanines and storage platforms

Composite scenario. An industrial tenant installs a steel platform and racking from a catalogue supplier. Nobody checks whether the existing slab can take the column point loads, whether the new floor area is allowed, or whether escape distances still work. Mezzanines raise all three regulators’ questions at once: structure (BCA), fire safety (SCDF), and floor area (URA). The Toa Payoh incident above shows the stakes.¹¹

Roof extensions and covered yards

Composite scenario. A landed house owner roofs over the back yard and adds walls to create a storeroom. What began as a shelter is now enclosed floor area. The structure may be light, but fixings into the existing building, drainage, and floor area under planning control all need checking. Enclosures can also affect natural ventilation and lighting of adjacent rooms.

Enclosed balconies and AC ledges

Composite scenario. A condominium owner encloses a balcony with full-height glass panels for air-conditioning. URA’s guidelines state that balconies are semi-outdoor spaces and shall not be enclosed with walls or glass panels; only approved balcony screens that can be fully opened and allow airflow at all times may be allowed.¹⁶ AC ledges have their own floor area rules, and how they are treated for gross floor area depends on whether they are strata area.¹⁷ Converting either into indoor space changes the planning position and the façade, and may be picked up at PFI.

Signage and external structures

Composite scenario. A tenant installs a large illuminated sign and a steel canopy above a shopfront. The sign has no licence and the canopy has no engineer’s design; brackets are bolted into cladding rather than the structure behind it. Signboards and canopies are exterior features with maintenance obligations, and a fallen exterior feature that injures someone or damages property must be reported to BCA within 6 hours.¹⁸ See signage and structures.

Unapproved openings in slabs and walls

Composite scenario. A fit-out adds an internal staircase between two floors by cutting a slab opening, and later a services contractor cores several large holes through a beam for ductwork. Each opening interrupts load paths. Openings in structural elements are structural works requiring plans and a permit, and coring through beams can cut reinforcement. Regularisation usually requires scanning, recalculation and, often, strengthening with steel trimmers or fibre-reinforced polymer.

How to avoid creating unauthorised works

Buying or leasing: due diligence checklist