Waterproofing Contractors Singapore: Only Three of Fourteen Will Tell You the Warranty (2026)

Waterproofing is bought on one question: will it hold. The answer a contractor is willing to put in writing is the warranty, and across fourteen Singapore firms checked on 8 September 2026, three publish a term. They range from one year to ten. The rest either mention warranties without a number or say nothing.

The ratings are no help here. Thirteen of the fourteen carry one, and every one sits between 4.5 and 5.0, with a median of 4.9, on review counts of 20 to 219. A category where everyone scores 4.9 on eighty reviews is a category where the score has stopped carrying information.

Who publishes a warranty term

Contractor	Warranty stated	Rating	Reviews
HandyMe Waterproofing	Up to 10 years, BCA-registered	5.0	77
The Roofing Specialist	5 years on waterproofing and re-roofing	4.9	219
Allstar Waterproofing	1 year	4.5	24
Classic Waterproofing & Plumbing	Warranties provided, no term stated	4.7	146
Flux Solutions	Not stated	4.9	164
2ezBuilders	Not stated	4.8	108
B4 Water Leakage Specialist	Not stated	4.7	101
WaterSeal Singapore	Not stated	5.0	80
High Tech Roofing	Not stated	4.9	53
Hydro-Seal Engineering	Not stated	5.0	33
K.K. Roofing Contractors	Not stated	4.9	28
Waffen Waterproofing	Not stated	4.7	25
GTC 2000	Not stated	4.8	20
Hydroworks Waterproofing	Not stated	Not listed	–

The gap between one year and ten is the whole decision

A one-year warranty covers the period when a bad job shows itself fastest, and almost nothing after. Waterproofing that fails tends to fail in the second or third wet season, when the membrane has been through enough heat cycling to move. A ten-year term and a one-year term are not the same product with different marketing; they are different amounts of risk sitting with the contractor rather than with you.

That is why the three who state a number matter more than the eleven who don't. HandyMe publishes up to ten years and describes itself as a BCA-registered company. The Roofing Specialist publishes five years on waterproofing and re-roofing, and holds the largest review base in this group at 219. Allstar publishes one year, which is worth knowing precisely because it is stated rather than left vague.

What the ratings can and cannot tell you

Three firms here hold a perfect 5.0: HandyMe on 77 reviews, WaterSeal on 80, Hydro-Seal on 33. The largest sample in the group, The Roofing Specialist at 219, holds 4.9. That is the usual pattern, and it means a 5.0 on 33 reviews should not outrank a 4.9 on 219 in your thinking.

The lowest rating here, Allstar at 4.5, belongs to one of the three firms that publishes a warranty term. Rating and transparency are not tracking each other in this category.

Waterproofing contractors: quick questions

How long should a waterproofing warranty be in Singapore?

Among firms that publish a term, the range is one to ten years. Five years is the middle of that range and the term The Roofing Specialist states. Most contractors publish no term at all, so the question is worth asking before work is agreed rather than after.

Which waterproofing contractor has the longest warranty?

Of those publishing a figure, HandyMe Waterproofing, at up to ten years. It also describes itself as BCA-registered and holds 5.0 from 77 Google reviews as of 8 September 2026.

Do Google ratings help pick a waterproofing contractor?

Barely. The thirteen with a rating all sit between 4.5 and 5.0, on review counts from 20 to 219, so they cluster too tightly to separate anyone. The warranty term does the work the rating cannot.

What does BCA-registered mean?

The Building and Construction Authority maintains a contractor registry, and registration signals the firm has met its criteria for the workhead it is listed under. HandyMe is the contractor in this group that states it on its own site.

How much does waterproofing cost in Singapore?

None of these fourteen publishes a rate. The work is quoted after an inspection, because the price turns on the area, the substrate and whether existing layers have to come off. Several offer a free inspection as the first step.

When does bad waterproofing usually show?

Not immediately. Failures tend to appear once the membrane has been through repeated heat cycling and a wet season or two, which is the reason a one-year term and a five-year term are so different in practice.