Top 7 Heritage Building Restoration Firms in SG

Singapore holds roughly 7,200 conserved structures under the URA Conservation Master Plan, from national monuments like the Victoria Theatre to plain-tile shophouse terraces in Jalan Besar. Restoration work here is not a decorative trade. It is governed by NHB (National Heritage Board) and PMB (Preservation of Monuments Board) approvals, URA facade retention rules, and a thin pool of contractors who can combine lime mortar repointing, structural jacking, and MEP insertion without breaking a heritage envelope. The firms below dominate that pool in different ways: some take the monument-scale tenders, some own the engineering certification, and one treats restored shophouses as an asset class.

1. Wah Loon Engineering Co. Pte. Ltd.

Wah Loon is the reference contractor in SG for monument-scale adaptive reuse. Their flagship remains the National Gallery Singapore — the conversion of the former Supreme Court and City Hall. The execution constraints were extreme: retain two neo-classical facades, reinstatement the Supreme Court Chamber’s plaster cornices, restore the 57-metre Gregory dome, and still excavate two basement levels underneath. Wah Loon ran top-down construction with temporary steel shoring columns driven through the heritage floors, then stitch-pinned the existing masonry to new load paths. They also handled the specialised casting of fibrous plaster, which is done off-site in rubber moulds and craned through roof openings to avoid scaffolding contact with the facades.

Best suited for: national monument conversions and projects requiring top-down basement insertion below a retained envelope.

2. Woh Hup (Private) Limited

Woh Hup’s heritage reference project is the Capitol Singapore mixed-use restoration — the Capitol Building (1933), Capitol Theatre (1929), and Stamford House (1904) — all three intertwined with a new 34-storey tower and retail basement. The theatre work is the most technically dense: full reinstatement of the proscenium arch, decorative ceiling roses, and plaster wall reliefs, with modern falsework built from the orchestra pit upward. Stamford House required hand-matching of granite columns and balusters, while the retained arcade running along North Bridge Road had to be structurally isolated from the new tower’s pile cap settlement. Woh Hup also delivered the Victoria Theatre & Concert Hall restoration, where the 1862 Palladian facade was wrapped in a full-height scaffold and the interior roof trusses replaced with steel while the theatre remained partially operational.

Best suited for: complex mixed-use heritage sites and civic hall interiors.

3. Koh Brothers Group Ltd.

Koh Brothers is the engineering-heavy constructor on the NHB institutional circuit. Their most visible completed work is the National Museum of Singapore restoration, where a 1887 neo-Palladian monument was stiffened while a new glass-and-steel atrium was slung over the original courtyard. The structural programme involved cutting away deteriorated brick-infilled wall sections, replacing Doric columns in matched reinforced concrete, and under-pinning the foundation with micro-piles because vibration limits around the display galleries were set at near-zero. Koh Brothers works primarily as main contractor for government-linked owners, meaning they carry the payment-bond and liability structure that NHB tenders require. Their in-house precast yard gives them direct control over replicated cornices, keystones, and balustrade sections.

Best suited for: Class 1 monuments and government-tendered restoration contracts.

4. Tiong Seng Holdings Ltd.

Tiong Seng operates a dedicated heritage and restoration unit that competes for institutional conservation tenders inside restricted government precincts — the Istana grounds, Fort Canning, and colonial-era medical compounds. The edge here is logistics compliance: night-window construction, helicopter lift slots, daily security clearances, and storage limits inside live compounds. Tiong Seng executes staged A&A on old bungalows and annexes, where each trade sequence is gated by a PMB inspection hold point. They have practical depth in stone repointing with hydraulic lime mixes, cast-iron rain water pipe replication, and timber louvre replacement sourced from kiln-dried balau and chengal stock. For heritage estates where tenant agencies remain operational throughout restoration, Tiong Seng is the pragmatic bidder.

Best suited for: state and military heritage estates with restricted site access.

5. LHN Limited

LHN is the commercial play in SG heritage. Their Space Enhancement division (Lecon) acquires or leases URA-conserved shophouses across Jalan Besar, Balestier, Little India, and Telok Ayer, then restores the five-foot way, timber floors, and original roof frames before converting the unit into co-living (D·Residence), budget hotel (D·Hotel), or F&B tenancy. Unlike the monument contractors, LHN drives a hard cost-per-square-foot model: restoration is scoped to URA compliance, not museum-grade exactitude. Their technical stack focuses on waterproofing membranes over the original roof tiles, termite soil treatment around the perimeter, and structural timber splicing where termite damage has eaten the bearer joists. Acquisition-to-open timelines sit under 12 months, which is unheard of in the NHB-led segment.

Best suited for: conserved shophouse conversion and heritage asset enhancement.

6. Arup Singapore Pte. Ltd.

Arup is the conservation engineer behind most major restoration permit applications in SG. They are brought in early, before any contract award, to produce the structural feasibility study that the URA and COB (Commissioner of Building Control) use to issue approvals. Their team runs the load-path assessment, ground-penetrating radar scans, probe-hole investigations, and long-term facade monitoring that determines whether a 1920s reinforced-concrete frame can take two extra floors, or whether new pile caps must be driven through the basement. For shophouse backland extensions in Chinatown and Kampong Glam, Arup’s structural reports on party-wall stability and differential settlement are effectively the industry standard. They are not a contractor, but no top-tier restoration firm executes without their signed certification.

Best suited for: structural pathology, condition surveys, and engineering sign-off.

7. Gammon Pte. Ltd.

Gammon rounds out the top tier as a high-value institutional restoration contractor. Their methodology is fabric-first: every marble finial, cast-iron pipe, timber louvre, and plaster motif is catalogued and tagged in a site workshop before any demolition or stripping begins. They built their heritage reputation on colonial military and statutory buildings — admin blocks, barracks, and civic annexes — where the NHB’s Preservation of Monuments Board controls every trade sequence down to the type of paint stripper used on original joinery. Gammon stations a conservation architect on site full-time, which shortens approval cycles with the authorities because the documentation is generated internally rather than through an external consultant. This makes them the safe pair of hands for public assets where there is zero tolerance for subcontractor improvisation.

Best suited for: NHB-approved statutory and military heritage estates.