Concrete Markham
“Really glad I got a stamped concrete patio and driveway done.”
Best Basement Waterproofing Contractors near Markham, ON
2 of these contractors are based in Markham; the others serve Markham from towns including Toronto (17 km), North York (23 km) and Whitchurch-Stouffville (9 km).
3 open 24/7 · 11 open weekends · 14 rated 4.5+ · 4 show a licence
Data verified October 21, 2026
Hadasa Contracting & Excavation
“I would not hesitate in recommending Hadasa Contracting to anyone needing professional services relating to ground water and drainage”
Drain 1 Plumbers Inc.
“He got to the root of the cause and fixed the issue and made sure we were happy and satisfied before he left.”
Aluneed Ltd
“If you're looking for a reliable, efficient and effective waterproofing company Aluneed and Alex is definitely your answer.”
Act Fast Waterproofing Corp.
“During the work, they discovered an issue with my concrete floor and offered to fix it!”
Canadian Concrete Leveling
“From the start, they were able to give me a proper quote and were promp on the timeline to finish the project.”
The 15 contractors listed for Markham, 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: Markham, ON
The 15 contractors on this page are rated from 4.3 to 5.0 across 1,095 reviews; 8 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 (92%), quality (87%) and responsiveness (82%). The topics that come up most in reviews of the contractors on this page are "price" and "estimates". 3 are open around the clock; 10 are open on Saturdays and 8 on Sundays. 4 show a licence on their websites and 1 lists staff certifications (IICRC). Domain records put 5 websites of the contractors on this page at ten or more years old; the oldest dates from 2000. 3 offer emergency call-outs; 1 offers financing or payment plans; 10 give free estimates; 6 are family- or locally-owned and 3 list coupons or special offers. We have a website on file for all 15 of the contractors on this page; all 15 publish a contact page; 14 list a public email and 2 take 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 Markham. 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.
Danar Co. GTA
“Additional attention was given to a flower bed and interlocking pavers adjacent to the walkway, and installation of a new single step at the end of the walkway increased aesthetics and safety.”
MT Drains & Plumbing LTD
“Very thorough and knowledgeable during the quoting process - and they did an incredible job repairing a wet basement issue we've had for YEARS!”
City Wide Group
“Excellent experience from start to finish - thank you to everyone at City Wide - strongly recommend services.”
Pryde. Group Corp. Basement Drains and Waterproofing in Toronto
“What sets them apart is their commitment to thoroughness—they start work early each morning, maintain continuous progress throughout the day, uphold a vigilant cleanup routine, and leave the job site clean upon completion.”
Three Little Pigs Masonry
“After having spoken with several other masonry companies, I appreciated that he took the time for an in-person visit even though we'd not yet committed to contracting the work to him.”
Leaky Basement
“They truly care about their employees and they take the time to understand their customers concerns.”
Northland Paving Toronto
“Very happy with the end result from the office staff to the crew who did the physical work.”
Flood Tech
“They came out a few days later to give me an estimate and had someone out to remove the carpet the next day.”
Canadian Home Comfort
“On an emergency basis they came in right away, unblocked the drain and installed a backwater valve and sump pump.”
Why these companies made our list
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