A&A Works to Conserved Shophouses in Singapore: URA's 3R Rules, Permits and Fire Safety

A conserved shophouse is one of the few buildings in Singapore where the law cares about the original material as much as the finished result. In an ordinary A&A project, the authorities ask whether the new work is safe and permitted. In a conserved building, the Urban Redevelopment Authority (URA) also asks what you are taking away. A timber floor replaced with concrete, a rear wall rebuilt in new brick, a granite five-foot-way kerb lifted and discarded: each can be a breach even if the replacement is structurally better.

The stakes were made concrete in April 2026, when a court fined an individual S$250,000 and a property-owning company S$150,000 over unauthorised demolition at a conserved shophouse at 32 Desker Road, and ordered the building to be reinstated.⁷ The maximum penalty where unauthorised works in a conservation area include demolition is S$500,000, imprisonment of up to 12 months, or both.⁵

This guide sets out URA’s conservation principles, which elements must be kept, the additions URA permits (rear extensions, roof mezzanines, lifts, roof structures), the conservation permission process, the structural and fire-safety issues peculiar to old timber-and-brick buildings, and change of use. It reflects URA’s guidelines and the law as at 9 November 2026. It is written for owners, tenants and fit-out managers of conserved shophouses; for approvals in ordinary buildings, start with the master guide to A&A approvals.

The principle: maximum Retention, sensitive Restoration, careful Repair

URA describes the “3R” principle as fundamental to all conserved buildings, whatever their size or complexity: maximum Retention, sensitive Restoration and careful Repair.¹ Its explanation draws out several working rules:¹

• all original structural and architectural elements should be retained and restored;
• replacement is a last resort, and where it is necessary, for example because an element contains asbestos, the owner needs URA’s clearance for a one-to-one replacement;
• wholesale rebuilding is regarded as contrary to accepted international conservation practice;
• in adaptive reuse, the existing structure should be kept and strengthened or repaired, as unobtrusively as possible and with original methods and materials where feasible;
• the building should be researched and recorded before work starts, and each stage documented.

In practice, the 3R principle reverses the usual contractor instinct. The default is to repair the existing timber joist, not to replace it; to re-lay the original clay tiles, not to substitute new ones; to restore the original window, not to reproduce it. Any departure needs a reason the QP can put in writing to URA.

URA reissued its Do-It-Right Guide for conserved shophouses and terraces on 2 June 2026, with improved visual examples of allowable works, submission requirements and long-term maintenance; the circular noted unauthorised alterations causing irreversible loss of original fabric, and incompatible materials accelerating deterioration, as recurring problems.¹¹

Historic districts, secondary settlements and why the category matters

URA publishes separate planning parameters and restoration guidelines for different kinds of conservation area. For shophouses, the two that matter most are:

• Historic Districts, where URA applies the strictest form of conservation. URA’s press release on 32 Desker Road described Little India as one of four historic districts.⁷ The Historic Districts guidelines refer to the core areas of Chinatown, Kampong Glam and Little India.²
• Secondary Settlements, such as Balestier, Joo Chiat, Geylang, Jalan Besar, Tanjong Katong and Tiong Bahru, where owners may conserve the main building and add a rear extension.³

The differences are material. Comparing the two sets of guidelines:

Your QP should confirm the specific guidelines for the property on URA’s Conservation Portal; some streets also have site-specific restoration guidelines.

What must be kept

Roof

The main roof’s original profile, pitch, height, party wall and eaves projection are to be retained and restored.²³ In historic districts, the tiles are to be small, V-profile, unglazed and natural-coloured clay.² Dormer windows are not allowed; jackroofs and skylights are allowed only within URA’s positioning, setback and size limits (skylights on pitched roofs up to 30% of the slope, protruding no more than 150 mm).² Where the roof needs strengthening with steel or reinforced concrete (RC) beams, the design must minimise visual impact on the traditional timber roof structure.²

Party walls

Party walls in shophouses are the principal load-bearing walls. The first 3 m of the load-bearing party wall perpendicular to the first-storey shopfront must be retained, preserving the fine-grained rhythm of the street.²³ In historic districts, new openings in a party wall are allowed if their total width is less than 50% of the wall’s length within the building envelope; in RC-framed buildings these controls do not apply.² Timber floor supports must abut the party walls.² Because conserved shophouses share party walls, URA and BCA’s joint circular of March 2023 warns that they are prone to damage from vibration and ground movement caused by works on or next to them.¹⁰

Timber floors and staircases

In historic districts, URA states it is important that the timber floor be retained; original RC floors can stay as they are.² Where floors are timber, any new staircase must be lightweight (timber or metal), not RC, and must not abut window, door or vent openings; the existing staircase may be retained or relocated with its original railings reinstated.² In secondary settlements, existing timber floors are encouraged to be retained and restored.³ Voids of up to 25% of each floor are allowed, and the first-storey floor may be lowered by up to 600 mm for landscaping, ponds or lift pits.²

Front façade and five-foot way

Fanlights, windows, doors, vents and decorative features on the front façade are to be retained and restored, and balconies kept open.² The five-foot way’s original granite slab borders must be retained and restored, and the covered walkway’s character protected.²³ Changing five-foot-way flooring is a Category 3 work that still needs permission.⁴

Airwell, rear façade and rear service block

The airwell’s original size and location must be kept. It may be covered by a new roof that sits lower than the main roof eave and is lightweight and transparent or translucent; no lift, floor or other structure may be added in it.² Original rear windows may be retained and restored or changed to French windows matching the front, and existing openings in the rear service block may be retained and restored.² The rear is where owners most often assume they have a free hand. The 32 Desker Road case shows otherwise: URA described the rear façade, with its timber casement windows and green glazed ceramic vents, and the entire rear service block as fundamental elements that should have been fully retained.⁷

What can be added

URA’s guidelines allow a defined set of additions. All need conservation permission, and most are Category 1 or 2 works.⁴

Rear extensions (secondary settlements)

In secondary settlements, an owner may conserve the main building and add a new rear extension. URA sets heights area by area, for example up to 6 storeys in Balestier and Jalan Besar, 5 in Beach Road and Joo Chiat, 4 in Tanjong Katong (5 for specified units) and Tiong Bahru shophouses, and 10 in River Valley.³ Any part of the extension that rises above the main pitched roof eaves must be set back at least 600 mm clear of the conserved building, the design and materials of the extension’s roof and façade may vary, and any required car parking goes within the extension.³ A new rear extension is a Category 1 work.⁴

Roof mezzanines (attics)

New roof mezzanine floors are allowed within the building envelope, subject to setbacks from the inner face of the front façade: at least 1,500 mm if the floor is not lower than the top of the uppermost window or fanlight, or at least 2,500 mm if it is lower. The floor may not abut any window, door, transom or fanlight; it is built with timber joists and boards, with RC allowed only if the original uppermost floor was RC; and dormers are not allowed.²³ Fire Code limits on attic size apply on top (see below).

Roof structures, lifts and other items

In historic districts, single-storey structures on flat roofs may be up to 3,600 mm high, cover no more than 35% of the flat roof area and be set back at least 3 m from front and side street elevations; roof-top plant must be screened on all sides.² Lifts are allowed within the building envelope, but not in the airwell or rear court; a shaft protruding above the roof must sit on the rear slope or a secondary roof and below the main ridge.² Canopies over openings may project up to 450 mm.² New basements are not allowed.²³

The conservation permission process

Section 12(2) of the Planning Act makes it an offence to carry out, or permit the carrying out of, any works within a conservation area without conservation permission.⁵ The ordinary fine is up to S$200,000, plus up to S$10,000 a day for a continuing offence after conviction; where the works include demolition of a building or part of one, the maximum rises to S$500,000, imprisonment of up to 12 months, or both.⁵

URA sorts works into three categories:⁴

For Category 1 and 2 works, the sequence is: the architect consults the technical agencies; submits to URA with a measured survey endorsed by a registered surveyor, a PE’s structural report, calculation plans, photographs, and a detailed structural investigation report, method statement and protection plan endorsed by the engineer; URA issues conservation permission; the architect then obtains building plan approval from BCA and BCA’s permit; URA may inspect during the works; and on completion URA carries out a TOP/CSC inspection, granting clearance only if the works follow the approved plans.⁴ For Category 3, the owner or contractor submits photographs or drawings with the owner’s authorisation, waits for permission, and submits completion photographs for URA’s endorsement; no work may start before permission is issued.⁴ If unsure whether permission is needed, URA asks owners to consult it before starting.⁴

URA also notes the financial side. Development charge applies to new extensions and new floor areas such as roof mezzanines, but can be waived where restoration follows the approved plans and is completed within two years of the conservation permission; a car park deficiency charge can be waived if the guidelines are fully complied with.⁴ The Land Betterment Charge, administered by the Singapore Land Authority, replaced development charge and related levies from 1 August 2022.⁴

Structural issues in old shophouses

Why old shophouses need a different structural approach

Pre-war shophouses typically combine load-bearing brick party walls, timber floors on timber joists, timber roof structures and shallow foundations. URA and BCA’s joint circular of 1 March 2023 asks QPs working on or next to conserved buildings to account for that vulnerability and to propose structural and foundation systems that meet code requirements for the building’s full design life.¹⁰ It notes that works to façades, roofs, party walls, floors and rear extensions can cause differential settlement, and that BCA structural plan approval is required where structural modifications are involved, alongside conservation permission.¹⁰ It also reminds owners that conserved buildings should be regularly maintained, with a PE engaged to address the root cause of defects such as spalling, cracks, termite damage and water leakage.¹⁰ Our guide to cracks in walls and ceilings helps distinguish cosmetic from structural cracking.

The approvals

Structural plans must be submitted by a PE in the civil or structural discipline.¹³ Under the Fourth Schedule of the Building Control Regulations, building works for shophouses not exceeding 3 storeys do not need an Accredited Checker’s certificate, but an attic or basement floor of more than 100 m² counts as a storey for that purpose.⁹ Building works without approved plans or a permit carry a fine of up to S$200,000, two years’ imprisonment, or both, for anyone who carries out, permits or authorises them.¹⁴

Practical points

• Repair before replace. Timber joists with localised rot or termite damage can often be spliced, sistered or strengthened; URA treats one-for-one replacement of floor boards and joists as Category 3, but anything beyond that is a design decision with URA.⁴
• New loads go to new structure. Lifts, roof-top plant and mezzanines should be supported independently where the existing walls cannot take them, with the visual impact minimised.²
• Protect the neighbour’s wall. Party walls are shared. Avoid percussive hacking near them, and agree monitoring before demolition at the rear. The circular’s warning on vibration and ground movement applies to both sides of the wall.¹⁰ Our guide to hacking walls and structural elements covers safe methods.

Fire safety: Fire Code clause 9.9

The Fire Code 2023 has a dedicated clause, 9.9.1, for buildings with timber floors or staircases that are designated for conservation or were built before 1969.⁸ Its key requirements are:

The clause also allows the rear courtyard to be covered up to the second-storey floor level if a protected exit staircase discharges to the back lane, and treats a retained timber-floored building next to a new RC extension as a separate building with independent staircases and 4 m between window openings.⁸

One procedural point surprises tenants. SCDF’s minor A&A lodgement route, used for small fit-out changes in other buildings, cannot be used for conservation projects: the Schedule to the Fire Safety (Building and Pipeline Fire Safety) Regulations excludes them expressly.¹⁵ Fire safety works in a conserved shophouse therefore go through full plan approval by a QP. See our guide to SCDF fire safety approvals for the process and the Fire Safety Certificate.

Change of use

Uses in conserved shophouses follow the Master Plan and URA’s guidelines for each area; residential and institutional uses may be considered on commercial-zoned sites in historic districts, certain trades are not permitted, and new restaurants are not allowed in problematic traffic areas.² In the core areas of Chinatown, Kampong Glam and Little India, the first storey must have activity-generating uses such as shops.²

Where a change of use needs planning permission, the application is made through GoBusiness with the owner’s consent, costs S$500 (non-refundable) and generally takes 10 working days; URA advises not committing to a tenancy or renovation before its decision.¹² Other approvals follow, including SCDF’s fire safety clearance.¹² For a timber-floored conserved shophouse, the Fire Code’s bar on public accommodation uses is a threshold question to answer before any lease is signed.⁸

If works have already gone wrong

If you have bought or leased a shophouse with unapproved alterations, or works started before permission, stop and get a QP’s assessment before doing anything further on site. Under section 12(8) of the Planning Act, where a person is convicted without having been served an enforcement notice first, the competent authority may also order the removal, within 14 days, of property or materials used in connection with the offence.⁵ Our guide to unauthorised works and regularisation explains the general approach; in a conservation area, the answer often involves reinstatement rather than regularisation, as the Desker Road order shows.⁷

For a first pass at the approvals your works need, use the Approval Navigator. Our addition and alteration services page explains how we scope works in older buildings, and the glossary defines the terms used here.