Best Basement Waterproofing Contractors near Oshawa, ON
1 of these contractors is based in Oshawa; the others serve Oshawa from towns including Whitby (8 km), Hampton (12 km) and Bowmanville (13 km).
7 open weekends · 9 rated 4.5+
Data verified October 18, 2026
Aquaphobia Foundation Repair & Crack Injections
“He explained the process, products used & was easy to communicate with from start to finish.”
Basement Systems Toronto
“He spent considerable time checking everything out as to what was causing the issue from the inside and outside.”
Martyn Excavating
“He helped us troubleshoot our basement flooding issue and was able to quickly determine precisely what the issue was.”
Crawford & Son's
“Peter explained everything to me during the process and all questions were welcome.”
Duggans Waterproofing Inc
“Best price, very quick response, Awesome Crew and the clean-up was exceptional...”
The 11 contractors listed for Oshawa, ON work on wet basements, foundations and crawl spaces. Warranty claims, free inspection offers and hours come from each company's own website. Ask each one how the proposed repair holds up through frost, because that is where local systems fail.
Area overview: Oshawa, ON
10 of the 11 contractors on this page have a rating, from 1.0 to 5.0 across 445 reviews; 3 have 50 or more reviews and 9 are rated 4.5 or higher. The topics that come up most in reviews of the contractors on this page are "price" and "estimates". 7 are open on Saturdays and 4 on Sundays. Domain records put 4 websites of the contractors on this page at ten or more years old; the oldest dates from 1997. 6 give free estimates and 2 are family- or locally-owned. We have a website on file for all 11 of the contractors on this page; 8 publish a contact page; 6 list a public email and 1 takes bookings online. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
How many opinions should I get for a damp problem?
There are 11 listings for Oshawa. Get more than one assessment before committing, because diagnoses here differ more than prices do, and one crew's interior system is another crew's regrading and downspout job. Compare what each one says is causing the water rather than the number at the bottom.
Sierra Stone GTA and Rubber Stone
“Looks better than when the concrete was laid when pool was new.”
Durham Backhoe Basement Waterproofing
“They excavated and fixed the crack in my home, then returned the next day to finish up and restore my garden, removing any debris.”
RBZ Contracting
“Good people that cared when we had a major problem with the foundation our home.”
United Concrete Finishing
Morco Foundations
Why these companies made our list
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