Best Basement Waterproofing Contractors in Mississauga, ON
21 contractors listed · all 21 in Mississauga · 6 open 24/7 · 14 open weekends · 19 rated 4.5+
Data verified October 18, 2026
Rooterworx
Aquamen Waterproofing & Underpinning
Waterproofing PD
Pryde Group Corp
Galaxy Plumbing Inc.
The 21 contractors listed for Mississauga, 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: Mississauga, ON
All 21 contractors we list here are in Mississauga itself. We have 24 contractors in Mississauga on file; this page shows the highest-rated 21. 20 of the contractors on this page have a rating, from 3.5 to 5.0 across 1,625 reviews; 10 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (90%), quality (81%) and responsiveness (81%). The topics that come up most in reviews of the contractors on this page are "price", "estimates" and "cleanliness". 6 are open around the clock; 14 are open on Saturdays and 11 on Sundays. The services the contractors on this page list most often on their websites are basement waterproofing (3), exterior waterproofing (2), foundation crack repair (2), foundation repair (2) and interior waterproofing (2). 6 show a licence on their websites. Domain records put 3 websites of the contractors on this page at ten or more years old; the oldest dates from 2008. 6 offer emergency call-outs; 13 give free estimates; 1 is family- or locally-owned and 3 list coupons or special offers. We count these figures across the contractors on this page; 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 21 listings for Mississauga. 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.



