Action Restoration Foundation Repair
“He did a great job replacing a joist in a tiny crawl space - I honestly didn't think he'd get down there, let alone get a beam in, but he did!”
Best Basement Waterproofing Contractors in Ottawa, ON
15 contractors listed · 12 in Ottawa · 3 open 24/7 · 8 open weekends · 13 rated 4.5+
Data verified October 18, 2026
Braden Foundation Construction
“Ryan was honest and provided an honest opinion that saved me thousands of dollars that other company wanted to charge.”
EC Foundations
“They even made sure my lawn was not damaged in any way and fully cleaned up all affected areas before they left.”
Ardel Concrete Services
“I called a few other companies, checked their reviews and Ardel stood out and exceeded expectations with their service.”
Renco Home Improvements
“We were kept in the loop about what they were doing and everyone was polite and answered our questions.”
Ottawa Foundation Repair
“He told us what the problem was and gave us a reasonable quote.”
The 15 contractors listed for Ottawa, 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: Ottawa, ON
12 of the 15 contractors we list are based in Ottawa; the other 3 serve Ottawa from Gatineau, QC (7 km) and Gloucester (10 km). The contractors on this page are rated from 4.3 to 5.0 across 853 reviews; 7 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the contractors on this page are "price", "quality" and "communication". 3 are open around the clock; 8 are open on Saturdays and 6 on Sundays. The services the contractors on this page list most often on their websites are foundation crack repair (3), foundation inspections (2) and underpinning (2). 2 show a licence on their websites. 8 have ten or more years of experience, the longest 27 years. 3 offer emergency call-outs; 9 give free estimates and 4 are family- or locally-owned. We have a website on file for all 15 of the contractors on this page; 10 publish a contact page; 11 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 15 listings for Ottawa. 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.
Bol-Dan Foundation & Masonry Inc
“He took detailed measurements and notes and explained exactly what the repairs would entail before doing a thorough walk around the property to identify other potential foundation problems.”
Tierney Foundation Repair
“Had a great experience with both the owner and their staff!”
Foundation Repair Ottawa
Above Water Inc.
“Had to bring 2 contctors and one structural engineer and nothing was close to his work.”
Action Foundation Repairs
“I can't believe how these amazing peoples explain everything so well every details and took the time to do such an amazing job.”
Galipeau Multi-Service Group
Entreprises Nolet
“We did business with Entreprises Nolet to redo our French drains and install a polyurea membrane as well as a polyurethane one.”
Mr Foundation Inc.
“Each step along the way (from initial visit and quote with Jim, to multi-day onsite work coordinated by Chris, to wrap up), the team was well coordinated, efficient, and always showed up when they said they would.”
The Parging Company
“On time on budget and am very pleased with the completed work!!”
Why these companies made our list
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