Ontario Concrete Raising Ltd.
“Technician Spencer and helper Jarard did great work this morning and it really improved the look and function of my driveway and porch step.”
Best Basement Waterproofing Contractors near St. Catharines, ON
3 of these contractors are based in St. Catharines; the others serve St. Catharines from towns including Thorold (10 km), Niagara Falls (17 km) and Lincoln (17 km).
1 open 24/7 · 9 open weekends · 14 rated 4.5+ · 1 shows a licence
Data verified October 18, 2026
Hoss Concrete
“Justin was very reasonably priced and very flexible- I was very impressed with his honesty and attention to detail”
Beeline Cutting & Coring
“If you need concrete cutting he's the best.”
Stronghouse Contracting
“The chimney repair and rebuild was done without delay and great care was taken to protect our roof and skylights.”
Proseal Waterproofing & Contracting Inc.
“They were thorough, professional, and helpful offering advice on how we should move forward.”
Moffat Foundations & Repair
“Professional, proficient and takes time to listen and answer questions.”
The 15 contractors listed for St. Catharines, 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: St. Catharines, ON
The 15 contractors on this page are rated from 4.4 to 5.0 across 496 reviews; 2 have 50 or more reviews and 14 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (97%), quality (80%) and responsiveness (77%). The topics that come up most in reviews of the contractors on this page are "price" and "estimates". 1 is open around the clock; 9 are open on Saturdays and 5 on Sundays. 1 shows a licence on its website. Domain records put 6 websites of the contractors on this page at ten or more years old; the oldest dates from 2010. 2 offer emergency call-outs; 6 give free estimates; 2 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 15 of the contractors on this page; 13 publish a contact page and 12 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 15 listings for St. Catharines. 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.
Harris Waterproofing
“Our issue was solved right there and then without much hassle, unlike other company that we tried which was awful.”
Foundation Fix Inc.
“He was quick and was able to accommodate my emergency even though it was thanksgiving weekend.”
WET AND Humid NO More Ltd.
“Handled unforseen obstacles professionally and reasonably and had all the equipment to do the work that needed to be done.”
Tybo Concrete Coatings & Restoration
“I would definitely recommend Tybo Concrete to anyone in the same boat as myself.”
K.r.s. Concrete Construction
“Great work on the sidewalk and patio!”
All-Pro Waterproofing & Excavating Inc
“The contractors came on time and stayed until the job was complete.”
Robson Foundations
“They came back out less than a week later and began the work, in less than a day they were already halfway done and very meticulus with their work.”
Seal-Tite Quality Concrete
“Their work was done ahead of schedule and they were very thorough and professional and a pleasure to deal with.”
Algoma Contractors
Why these companies made our list
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