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WaterproofingIndex

Best Basement Waterproofing Contractors in Markham, Ranked (2026)

Last updated: By Below-Grade Records Desk

7 basement waterproofing contractors cover Markham, compiled August 2026.

171 Google reviews · median 4.96★ · typical $50–$80 per linear ft (Project Landscaping (Ontario)) · 100% of rated companies at 4.8★ or above · scheduling: interior work year-round; exterior excavation typically April to November

Companies

Who does basement waterproofing in Markham?

Looking for a basement waterproofing contractor in Markham? WaterproofingIndex has 7 on file, averaging 4.96★ across 171 Google reviews, as of August 2026. Half carry more than 38 Google reviews and half fewer. Full basement waterproofing cost guide.

Ranking

What decides the order on this page?

The WaterproofingIndex Score orders these 7 basement waterproofing contractors, whose median review count is 38. Position is not for sale. How the score is built.

Rules

Permits and subsidies for basement waterproofing

Permit rules and subsidies do not change between Markham and the rest of the GTA, so they are answered once, on the basement waterproofing page.

Coverage

Nearby areas and related work in Markham