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Basement waterproofing and drainage in Markham

Last updated: By Below-Grade Records Desk

11 below-grade contractors are listed within 7 km of Markham, compiled August 2026.

average Google rating 4.9★ · borough / region: York Region · deepest category: Basement Waterproofing (7 listed) · ordered on Google review data, not paid placement

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Which basement waterproofing contractors are listed for Markham?

See all 7

7 basement waterproofing contractors are listed for Markham, averaging 4.96★ over 171 Google reviews. Direct Waterproofing Inc holds the top position at 5★ from 49 reviews. Order comes from review data and record completeness, never payment.

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Which sump pump and backwater valve installers are listed for Markham?

See all 5

5 sump pump and backwater valve installers are listed for Markham, averaging 4.86★ over 672 Google reviews. Direct Waterproofing Inc holds the top position at 5★ from 49 reviews. Order comes from review data and record completeness, never payment.

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Which underpinning contractors are listed for Markham?

3 underpinning contractors are listed for Markham, averaging 4.9★ over 30 Google reviews. Concrete Markham holds the top position at 5★ from 1 reviews. Order comes from review data and record completeness, never payment.

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Which foundation repair contractors are listed for Markham?

2 foundation repair contractors are listed for Markham, averaging 5★ over 8 Google reviews. Concrete Markham holds the top position at 5★ from 1 reviews. Order comes from review data and record completeness, never payment.

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Which below-grade services are covered in Markham?

One row per category WaterproofingIndex covers in Markham: how many companies are listed, what they average on Google, and the GTA price range published for that service. The ranked list for each one follows underneath.

WaterproofingIndex dataset, August 2026. Ratings from public Google reviews.
CategoryListed prosAvg Google rating
Basement Waterproofing74.96★
Sump Pumps & Backwater Valves54.86★
Underpinning & Basement Lowering34.9★
Foundation Repair25★

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Why are some companies missing from this page?

38 of the 384 companies here publish no street address, only a Google service-area centroid, and 4 of them share one such point. That is not an address, so none of them is placed in Markham. Find them in the A-Z index, and ask which areas they cover.

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Which areas next door are covered?

Below-grade crews work across boundaries, and a company two neighbourhoods away is often on the same street the following week. These Greater Toronto Area areas next to Markham have their own lists.

Waterproofing in Markham: frequently asked questions

Who works on wet basements in Markham?

WaterproofingIndex's August 2026 dataset holds 11 below-grade contractors covering Markham, at an average Google rating of 4.9★. Basement Waterproofing is the deepest category here, with 7 listed. Get three itemised quotes before you commit to any of them.

Which below-grade service scores highest in Markham?

Basement Waterproofing leads on rating: 5.0★ across 5 rated companies, ahead of every other category WaterproofingIndex covers in this area. The stars come from Google reviewers, and our order weighs how many of them there were.

What should a Markham homeowner expect to pay for basement waterproofing?

Project Landscaping (Ontario) publishes $50 to $80 per linear ft for interior drainage, basic system across the GTA, before 13% HST. Depth and access are what move a Markham quote inside that range. The basement waterproofing cost guide on WaterproofingIndex breaks out every line item with its source.