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K.r.s. Concrete Construction
“They finished the job on time, maintained cleanliness, and everything turned out beautiful.”
Best Basement Waterproofing Contractors near Thorold, ON
2 of these contractors are based in Thorold; the others serve Thorold from towns including St. Catharines, Niagara Falls and Oakville.
5 open 24/7 · 16 open weekends · 23 rated 4.5+ · 3 show a licence
Data verified October 21, 2026
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All-Pro Waterproofing & Excavating Inc
- Basement
“Ron's communication was prompt and extremely comprehensive, and I could only admire the job he and his crew did waterproofing my 96-year-old mother's basement after city road works (can't prove it, but the timing is too much to be coincidence) opened...”
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Ontario Concrete Raising Ltd.
- Questions
- Quote
- Warranty
“What was so refreshing is that after all the time Taylor and Spencer have been doing this, they treat this process with awe, they demonstrated a pride of workmanship and enjoyed looking at the completed work with an innocent sense of delight.”
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Stronghouse Contracting
- Chimney
- Cleaning
- Roof
“Peter gave me an estimate within a few days of my contacting him (am still waiting for 2 other firms I contacted to get back to me) was very reasonably priced and gave me an approximate date of doing the work He was prompt and kept me informed throug...”
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Proseal Waterproofing & Contracting Inc.
- Basement
- Leak
- Team
“We had went to multiple other companies, and all had positioned an expensive exterior repair that would have required me to demolish an addition and my driveway on top of the cost for the waterproofing which was in $40,000 range.”
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Moffat Foundations & Repair
“Brian is the most knowledgeable honest person in this business, he came on a Sunday to fix my crack into the wall where others wanted to up sell for no sense.”
The 24 contractors listed for Thorold, 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: Thorold, ON
The 24 contractors on this page are rated from 4.4 to 5.0 across 1,202 reviews; 4 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (96%), quality (81%) and responsiveness (74%). The topics that come up most in reviews of the contractors on this page are "price", "estimates" and "efficient". 5 are open around the clock; 16 are open on Saturdays and 11 on Sundays. 3 show a licence on their websites. 12 have ten or more years of experience, the longest 30 years. 6 offer emergency call-outs; 11 give free estimates; 4 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 24 of the contractors on this page; 22 publish a contact page and 19 list a public email. 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 24 listings for Thorold. 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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Harris Waterproofing
- Basement
- Price
- Job
“He Gave me possibilities of where it could be coming in from and who I should be calling on upon 1st to see if that fixes the problem That would also save me a lot of money rather than going the exterior waterproofing route.”
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Foundation Fix Inc.
- Basement
- Wall
- Price
“Our tenant is a contractor and turned his BS-radar on when Sebastian came to do the estimate; the tenant called afterward to report how impressed he was with Sebastian, how his experience and expertise showed immediately - there were little things li...”
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Foundation Waterproofing by Moe
- Job
- Basement
- Team
“Pricing was super competitive and their office was easy and smooth to deal with for making payments - plus they went above and beyond in helping us obtain city permits and organizing final city inspections.”
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WET AND Humid NO More Ltd.
- Work
- Team
- Quality
“From the initial contact, to the respond time, to the site visit, to the scheduling, to the timely response to email questions, to starting the job, to finishing the job - it was all done well.”
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Tybo Concrete Coatings & Restoration
- Porch
- Parging
- House
“This year, we discovered a small crack in our porch from water bubbling up underneath it, when we called, he came right over to repair the crack free of charge, and he actually redid the whole step to ensure that the area was doubly protected.”
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Hoss Concrete
- Team
- Price
- Questions
“Justin was awesome from the start - got back to us with a quote right away, great communication the entire time, made sure all our questions and concerns were addressed.”
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Mike Smith Re:j Schulz Wa
- Price
- Problem
- Site
“Can't speak about the other guy but Adam did a fantastic job patching a rather large foundation hole and turns out he does a good job in repairing brick work as well.”
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Robson Foundations
- Team
- Basement
- Work
“Mark took his time to explain the bigger picture and the root causes, while being low pressure, making sure I understood we weren't in a desperate situation and how to monitor things to make sure they don't get worse.”
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Beeline Cutting & Coring
“If you need concrete cutting he's the best.”
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Seal-Tite Quality Concrete
“They laid plywood down across my grass (a good 300 ft) to bring their equipment onto the job site, taking extra care not to damage any area other than where they needed to dig.”
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Algoma Contractors
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Drychek Waterproofing
- Basement
“Turns out that we needed to have the exterior basement waterproofing installation after experiencing a serious foundation leak.”
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Dryseal Concrete Solutions Inc.
- Company
“We had quite a bit of landscaping done and the ground has likely shifted causing a very small leak to re-appear in one of the injection ports from the previous injection.”
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Aqua Dry Waterproofing Technologies
- Basement
- Leak
- Foundation
“Bradley was quick to respond and help out in explaining the waterproofing work and crack injection requried as well as going above and beyond to check my basement for any potential waterproofing issues.”
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Kemper Concrete Inc.
“After talking to Dennis at the initial visit I felt so confident that the job I needed done would be done to perfection Not every company felt comfortable tackling my job but Dennis stepped up and did a phenomenal job.”
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Thos. R. Birnie & Sons Ltd.
“The plumbers were very knowledgeable and friendly.”
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Prime Waterproofing
- Team
- Leak
- House
“He spent long time in my yard to teach me the construction of drainage system and how they would do for repair the cracks, setup the new pipes, and put the new soil/rocks.”
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Rooter-Man
- Job
- Efficient
- Basement
“Thank you so much Jerome for your support with walking us through the unfortunate issue we had at my dads (roots broke through the underground clay pipes).”
Basement Waterproofing Services in Thorold, ON Cost Estimates
Minimum cost
$820
Maximum cost
$15715
National Average
$5877
$2733
$8882
Fair price range is based on 304 cost profiles
Why these companies made our list
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