Cornerstone Waterproofing & Foundation Repair

Foundations & Underpinning in East York

5.09 Google reviews

No phone number is published for Cornerstone Waterproofing & Foundation Repair. ConcreteFinder publishes a number once a company has claimed its listing and confirmed it. Their website is linked in the card, and a quote request reaches them through us.

Works for: homes, commercial and industrial
In business: Says since 2004, about 22 years
City licence: No match found
Paperwork: Says it is licensed, insured and covered by WSIB
Offers: Free quotes

Cornerstone Waterproofing & Foundation Repair: concrete work photographed at the business, 1 of 2 — 2 photographs from this company's Google Business Profile, at the size the file carries.

Cornerstone Waterproofing & Foundation Repair: concrete work photographed at the business, 2 of 2 — 2 photographs from this company's Google Business Profile, at the size the file carries.

Market rate for foundation and underpinning work across the GTA

$350–$480 per linear foot

Source: Strong Basements. Excludes 13% HST. Not a quote from this company.

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Mon–Fri: 7 a.m.–5 p.m.
Sat–Sun: Closed

1692 Danforth Ave, Toronto, ON M4C 1H8
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Listed for

Its own website also names waterproofing, underpinning, foundation repair, concrete floors, basement entrances, floor drains, new foundations and basement waterproofing. Read from the company's site, not checked against any register.

What the public record shows

Read from registers anyone can search, on the dates shown. Nothing here comes from the company.

Web address first archived: 2013

ConcreteFinder Score

71 / 100

Scored on the same published method applied to every company on this site. Claiming a listing is free, and no company can pay to move. How the score works

Reviews and reputation: 34 / 45
What it states on its own site: 15 / 22
Website and record: 22 / 25
The claim: 0 / 8

What reviewers keep mentioning

Read from the 7 reviews stored on this record. Each phrase carries the review sentence it came from.

Basement waterproofing
Foundations
Finishes quickly
Cleans up after
Professional crew
Answers quickly

What it states on its own website

Read off Cornerstone Waterproofing & Foundation Repair's own pages. Nobody checked these against a register.

In business: Says it has been going since 2004, about 22 years
Says it is: licensed, insured and covered by WSIB
Says it works for: homes, commercial buildings and industrial sites
Says it does: Toronto Basement Assessment, Basement Waterproofing & Foundation Services, Basement Underpinning
Says it offers: quotes at no charge, a warranty on its work and out-of-hours work
Says it serves: Toronto neighbourhoods, Scarborough, and Mississauga, Toronto Neighbourhoods & Mississauga, Toronto

What customers say

9 of the 9 are 5-star. Ratings are set by the people who left them, not by ConcreteFinder.

Benjamin
Rated 5.0 out of 5 · Google review · 2 years ago
“I recently hired Cornerstone for my basement, and I couldn't be happier with the results. Their team was professional, efficient, and the quality of their waterproofing work exceeded my expectations. No more leaks, and my basement is now dry even during heavy rains. I highly recommend…”
Ashley
Rated 5.0 out of 5 · Google review · 2 years ago
“I recently hired Corner Stone Waterproofing for a project, and I couldn't be more pleased with their services. From start to finish, they demonstrated the utmost professionalism and expertise in waterproofing. Their team was punctual, efficient, and left no mess behind. The results speak for themselves…”
David
Rated 5.0 out of 5 · Google review · 13 years ago
“My wife and I just had our first child a few months ago, and it became quickly evident that after the arrival of our son that we were going to need more space as we both work from home. Our options were to add on to…”
Lori
Rated 5.0 out of 5 · Google review · 6 years ago
“Extremely professional and knowledgeable! Job site left clean and neat! Highly recommend them! We had a major leak and since the job was complete, not a drop of water.”

Where this came from

Everything above is public information, gathered from the sources below and shown with the date it was read. ConcreteFinder does not charge a company to appear, and no company can pay to change what is on this page.

Google Business Profile: Name, address, phone, opening hours, photographs, rating and reviews. Read July 2026.
Cornerstone Waterproofing & Foundation Repair's own website: Everything on this page introduced by the word “says”, quoted from its pages. Read September 5, 2026.
City of Toronto business licences: Searched under this trading name, in the renovator, driveway paving and drain categories, with no match. Read September 5, 2026.
Internet Archive: The year this web address was first archived. Read September 5, 2026.

ConcreteFinder checks the website, phone, photographs and hours on this record, and searches the City of Toronto business licence register for companies inside the city. It does not check insurance or WSIB coverage, and no register in this region publishes those. Ask for them before you sign anything.

Last updated: August 20, 2026By ConcreteFinder Research Team

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Questions about Cornerstone Waterproofing & Foundation Repair

Is Cornerstone Waterproofing & Foundation Repair well reviewed?

Cornerstone Waterproofing & Foundation Repair holds a 5.0-star Google rating across 9 reviews. Based on ConcreteFinder's analysis of Google review data, that is a strong score for a foundation contractor in the Greater Toronto Area. We always recommend comparing at least three quotes before you hire.

Where does Cornerstone Waterproofing & Foundation Repair operate?

Cornerstone Waterproofing & Foundation Repair works out of East York in the East York area and serves surrounding Greater Toronto Area neighbourhoods. Its listed address is 1692 Danforth Ave, Toronto, ON M4C 1H8.

How do I get a quote from Cornerstone Waterproofing & Foundation Repair?

You can contact Cornerstone Waterproofing & Foundation Repair directly or through its website, or through its Google Business Profile.

Before you hire, run through the questions to ask a foundation contractor.

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