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Best Basement Waterproofing Contractors near Oshawa, ON
1 of these contractors is based in Oshawa; the others serve Oshawa from towns including Toronto (46 km), Whitby (8 km) and Bowmanville (13 km).
2 open 24/7 · 16 open weekends · 18 rated 4.5+ · 3 show a licence
Data verified October 18, 2026
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Aquaphobia Foundation Repair & Crack Injections
- Area
- Renovation
- Job
“I called three contractors the first two wanted to excavate the outside and the third one I contacted was Aquaphobia Foundation Repair after seeing a video on utube.”
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Durham Backhoe Basement Waterproofing
- Home
- French Drain
- Quote
“Leak fixed fast and properly, and the warranty is lifetime thats transferable tells me they stand behind there work completely I would recommend them to anyone who needs there services”
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Aquaseal Foundation Crack Repair Wet Basement Solutions
- Drain
- Excavated
- Wall
“Aquaseal provided an online quote and was able to attend my residence in an extremely quick manner to first remove the improper repair and then fix the original issue.”
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Brad Duggans Waterproofing Inc
- Quote
- Team
- Foundation
“Knowledge and skills, ethics and professionalism and more-than-fair pricing -- value to the customer -- have made them the top-ranked/go-to water-proofing company in Toronto.”
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Martyn Excavating
- Business
- Basement
- Team
“Provided me options and great advice and were able to resolve my problem at a reasonable rate.”
The 24 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
22 of the 24 contractors on this page have a rating, from 4.0 to 5.0 across 1,097 reviews; 7 have 50 or more reviews and 18 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (93%), responsiveness (87%) and quality (85%). The topics that come up most in reviews of the contractors on this page are "price" and "estimates". 2 are open around the clock; 16 are open on Saturdays and 12 on Sundays. 3 show a licence on their websites. Domain records put 8 websites of the contractors on this page at ten or more years old; the oldest dates from 1997. 2 offer emergency call-outs; 12 give free estimates and 5 are family- or locally-owned. We have a website on file for 23 of the contractors on this page; 18 publish a contact page and 13 list a public email. 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 24 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.
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Sierra Stone GTA Rubber Stone
- Deck
- Product
- Porch
“The team did a wonderful job installing the new flooring and we couldn't be happier.”
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Crawford & Son's
“The crew that came to fix our water issue were so professional and did a amazing job.”
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Basement Systems Toronto
- Team
- Solution
“Just need to figure out if i can get my alarm company to monitor it now.”
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United Concrete Finishing
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RBZ Contracting
- Waterproofing
- Team
- Property
“Every trade that has come in after them has commented on what a great job they did, they neighbours go on about how hard they worked and they were a pleasure to deal with.”
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Solid Seal Concrete Medics
“We had 2 projects to be completed: Remove existing Granite Coating, clean, prime, reapply Granite Coating, seal and grout the crack between the slab & stairs of our front Porch; and restore the backyard Patio Subbase.”
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Morco Foundations
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Aluneed Ltd
- Cleaning
- Foundation
- Basement
“The prospect of having part of my property dug up for the greater good of waterproofing - and the mess that comes with it - left me feeling somewhat anxious.”
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Act Fast Waterproofing Corp.
- Home
- Rebate
- Job
“He arrived within a couple hours of our conversation and did a thorough assessment of the area, ruling out water damage or the need for any repairs apart from replacing one plank of wood.”
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Canadian Concrete Leveling
- Work
- Foam
- Walkway
“Most sincere thanks to Paul (sales), Kyle (concrete levelling technician), Cameron (caulking/sealant), and the admin staff who checked in and made timing arrangements, etc.”
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Hillside Waterproofing
- Skilled
- Opinion
- Price
“If you are looking for someone to waterproof your property, fix a leak or pour concrete then Gabin at Hillside Waterproofing is the perfect person to call!”
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City Wide Group
- Questions
- Reviews
- Team
“When I called CityWide they again did not take ANY responsibility every time we called them and asked about the warranty they said, well no, our job cannot be the source of the job”
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Northland Paving Toronto
- Asphalt
- Project Manager
- Team
“The teams communication between phases on the driveway (excavation, compacting, settling, paving) required continued pressing to get dates set that we could plan around.”
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Tri-City Roofing & Waterproofing Inc
- Price
- Phone
- Parents
“He discovered other issues with my roof and addressed the most pressing issue ( raccoons had eaten some piping / seal around the vents and posed a serious leak threat) in addition to the original job I commissioned him to complete.”
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Concrete Markham
“Really glad I got a stamped concrete patio and driveway done.”
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Canadian Sanitary Systems
- Valve
- Questions
- Sump Pump
“I was a bit skeptical with the city run sump pump subsidy program but was happy to see my reimbursement cheque covered the total cost right to the penny.”
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Dig Tech Infrastructure
- Team
“Fast , friendly and professional service… had several quotes but they took the time to explain what they needed to do to make my driveway the way I envisioned…”
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Guardian Seal Ltd
- Price
“Ryan and Team did a great job on our basement wall fixing a crack that let in water and humidity.”
Basement Waterproofing Services in Oshawa, ON Cost Estimates
Minimum cost
$852
Maximum cost
$16312
National Average
$6100
$2837
$9220
Typical price range is based on 491 cost profiles
Why these companies made our list
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