10 Best Waterproofing Contractors in Singapore
A shortlist of established waterproofing contractors in Singapore for bathroom, roof, balcony and basement leaks, each verified against its own website.
- Edited by
- Amir Wahab
- Published
- Reading time
- 4 min read
AI image by LocalRankWater leaks in Singapore's humid, high-rise environment rarely fix themselves, and the right specialist can mean the difference between a lasting repair and a recurring stain. This guide rounds up established waterproofing contractors in Singapore covering everything from HDB toilets and condo balconies to RC flat roofs, basements and external walls. Each was checked against its own website; use it as a shortlist, not a ranking.
1. SWC Construction
SWC Construction handles waterproofing across toilets, balconies, roofs, basements and swimming pools, alongside PU grouting and leak repair for wet areas. It pairs a thermal-imaging leak-detection process with a hacking-free treatment option, so many bathroom and balcony jobs can be tackled without tearing out existing tiles. The company describes itself as a BCA- and HDB-registered contractor with more than 20 years in the trade.
2. Prima Seal Waterproofing
Prima Seal offers bathroom, balcony, floor and ceiling-leak waterproofing along with wall-seepage and PU injection work. It promotes a 'flood infusion' treatment that seals wet areas without hacking up existing tile finishes, while still offering conventional hacking where a job calls for it. The company describes itself as a BCA-registered CR13 waterproofing contractor with over ten years' experience.
3. General Waterproofing & Service
General Waterproofing & Service works on roofs, balconies, pools, external walls and wet-area membranes, and also tackles spalling-concrete and facade repair. The firm takes a diagnosis-first line, saying it will not quote over the phone and instead begins with an on-site inspection, then verifies finished work with a 24-hour flood (ponding) test. It states it has been BCA-registered since 2007.
4. Atlas Works
Atlas Works covers toilet, balcony, flat-roof, kitchen and basement waterproofing plus wall- and ceiling-seepage and facade repair. Its pitch centres on a no-hacking method using a nano-technology coating it markets as self-healing, and the company advertises a three-year workmanship warranty. It also lists BCA registration and BizSAFE Level 3 certification.
5. Proseal Contracts
Proseal Contracts covers roof, wet-area, swimming-pool and planter-box waterproofing, plus leak tracing and PU grouting, and it uses rope access for high-level external repairs. Operating as a combined waterproofing and repainting specialist, it says it works with established membrane brands such as Davco, Mapei and Ardex. The company lists BCA registration under the CR13 waterproofing workhead and dates its experience to 1999.
6. CWP (Classic Waterproofing and Plumbing)
CWP combines waterproofing and licensed plumbing under one contractor, covering roofs, toilets, balconies, basements and external walls with both membrane systems and pressure grouting. Handling the plumbing itself means leaks traced to pipework can be addressed alongside the waterproofing rather than referred out. It states it is BCA-registered with more than 15 years of projects and provides written warranties on completed work.
7. DryProof Waterproofing
DryProof, operated by Vtech Waterproofing Solutions, leads with water-leak detection and ceiling-leak repair, including HDB cases, then handles toilet, balcony, roof, basement and car-park waterproofing. It emphasises lower-disruption fixes where feasible, offering flood infusion or targeted PU injection as alternatives to stripping out tiles. Its scope spans both homes and larger structures such as basements and car parks.
8. B4 Water Leakage Specialist
B4 Water Leakage Specialist concentrates on tracing and repairing roof and bathroom leaks, backed by roof and toilet waterproofing, concrete spalling repair and rope access for hard-to-reach spots. The company says it uses its own in-house crews rather than subcontractors, which it frames as a way to keep quality and communication consistent. It dates its founding to 2006 and describes over 15 years handling complex leak cases.
9. Asia Tech Roofing
Asia Tech Roofing is a roofing-led specialist whose waterproofing arm applies torch-on bituminous membranes, liquid polyurethane and acrylic coatings, and crystalline treatment for reinforced-concrete slabs, terraces and basements. Alongside sealing work it takes on structural repairs such as RC beam and slab patching and anti-carbonation coating, which suits ageing flat-roof and facade problems. It lists BCA licensing, bizSAFE Star and ISO certifications and dates its work to 2021.
10. High Tech Roofing & Waterproofing
High Tech Roofing & Waterproofing focuses on roof-leak repair and membrane waterproofing for RC flat roofs, balconies and exterior surfaces, and also fabricates metal roofing and cladding. Its methods span torch-on bituminous membranes, high-pressure PU injection and roof-drainage work, so it can address both the roof structure and the waterproof layer together. The company highlights its status as a BCA-registered contractor.
How to choose
- Confirm the contractor is registered with Singapore's BCA (many list the CR13 waterproofing workhead) and ask to see the registration rather than trusting a logo on the website.
- Have the leak properly diagnosed before agreeing to a method; a site inspection or leak-detection test should pinpoint the source, since sealing the wrong surface is a common reason repairs fail.
- Ask exactly what the warranty covers and for how long, and get it in writing, because a verbal promise is hard to enforce if the leak comes back.
- Clarify whether the job needs hacking or a no-hack treatment, and confirm what reinstatement (re-tiling, painting) is included in the quoted price.
- Ask who actually does the work, in-house crews or subcontractors, and make sure the scope targets the underlying cause rather than a cosmetic patch.
. No changes recorded since.
Founder and Editor
Amir Wahab is the founder and editor of LocalRank, an independent Singapore rankings and local guides publication.
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