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Waterproofing in Singapore typically costs between S$500 and S$15,000+ in 2026.
A targeted bathroom repair may run S$400–S$1,500, PU injection for a ceiling leak S$600–S$1,800, and full roof waterproofing for a landed property S$5,000–S$25,000. The final price depends on the area being treated, the waterproofing method, the extent of the damage, and how much preparation or reinstatement work is needed.
There is no single "market rate" for waterproofing — and any contractor who quotes you a fixed price without a site inspection is guessing. This guide breaks down realistic 2026 price ranges by area and method, explains the factors that move a quote up or down, and shows you how to compare quotations properly.
Each part of a building has different requirements. Bathrooms and kitchens need wet-area membranes and proper detailing at floor traps and pipe penetrations. Roofs need UV-resistant systems that can withstand Singapore's rainfall and heat cycles. Basements face hydrostatic pressure and need heavy-duty barrier systems — which is why basement waterproofing sits at the top of the price range.
A hairline crack with one leak path is a half-day PU injection job. Saturated screed, cracked tiles or multiple leak paths mean the honest fix is hacking out, drying the slab, applying a fresh membrane, screeding and retiling — which multiplies the cost. This is also why the gap between a localised patch (S$200–S$800) and a full redo (thousands) is so wide.
Hacking and disposal, drainage corrections, removal of an old failed membrane, scaffolding or rope access for façades, and retiling after the waterproofing itself — these line items often cost more than the membrane. Two quotes for the "same" bathroom can differ by thousands simply because one includes reinstatement and the other doesn't.
A proper wet-area job should include a 24-hour ponding test before handover, and reputable specialists back their work with a written warranty (typically 1–10 years depending on the system). Longer warranties and better membrane systems cost more upfront but are usually cheaper per year of protection.
HDB flats. The most common jobs are bathroom membrane failures and inter-floor ceiling leaks. For ceiling leaks caused by the unit above, HDB's default position is a 50/50 cost share between the upper- and lower-floor owners, and eligible flats may qualify for HDB's Goodwill Repair Assistance scheme. Most HDB ceiling leaks fixed at source fall between S$600 and S$1,800.
Condominiums. Similar methods to HDB, but management corporation (MCST) approval may be needed for works affecting common property, external walls or façades. Inter-floor disputes follow a similar shared-responsibility logic, but check your MCST by-laws.
Landed property. The biggest-ticket items: full roof waterproofing on an 800–1,500 sq ft flat roof typically lands between S$5,000 and S$25,000 depending on method and roof condition. If you're planning solar panels, waterproof the roof first — redoing it later means paying to remove and reinstall the panels.
Online price ranges tell you what's reasonable — only an inspection tells you what your repair costs. Triton Construction provides on-site assessments across Singapore, with itemised quotations, ponding tests on all wet-area works, and written warranties. Contact us for a no-obligation inspection and quote.