335 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Markham: Groundworks, CR Score 92/100; 4.9★ from 1,412 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): RCC Waterproofing Toronto, posts 24/7 hours; ranked #2 of 335.
Most-reviewed: Aquatech Basement Waterproofing Toronto, 655 Google reviews at 5.0★, the most of 335 ranked after Groundworks; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
335 Markham foundation repair companies are ranked here by CR Score, from 8 published factors. 132 are open 24/7, 274 open Saturdays and 204 open Sundays, based on posted hours. The median Google rating is 5.0★ across 335 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Groundworks | 92 | 4.9★ (1,412) | East Gwillimbury, 10 km away | Sat · Sun · Evenings | Overall |
| 2 | RCC Waterproofing Toronto | 92 | 4.8★ (634) | Toronto, 20 km away | 24/7 | Emergencies |
| 3 | Aquatech Basement Waterproofing Toronto | 90 | 5.0★ (655) | Toronto, 26 km away | Sat · Sun · Evenings | Most reviews |
| 4 | RCC Waterproofing Vaughan | 90 | 4.9★ (180) | Concord, 27 km away | 24/7 | — |
| 5 | RCC Waterproofing Markham | 90 | 5.0★ (32) | Markham | 24/7 | — |
| 6 | Aquatech Waterproofing | 89 | 5.0★ (78) | Vaughan, 24 km away | 24/7 | — |
| 7 | Lympia Contracting Inc | 89 | 5.0★ (30) | Richmond Hill, 6 km away | 24/7 | — |
| 8 | RCC Waterproofing North York | 88 | 4.9★ (77) | Toronto, 23 km away | 24/7 | — |
| 9 | Stay Dry Waterproofing | 88 | 4.8★ (97) | North York, 25 km away | 24/7 | — |
| 10 | Aquatech Basement Waterproofing Mississauga | 88 | 5.0★ (109) | Mississauga, 42 km away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,412 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 20 km away
Ranked #2 because of its Google rating and availability: 4.8★ from 634 Google reviews, open 24/7.
Based in Toronto, 26 km away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 655 Google reviews, listed on Google as “Waterproofing service”.
Based in Concord, 27 km away
Ranked #4 because of its Google rating and availability: 4.9★ from 180 Google reviews, open 24/7.
Based in Markham
Ranked #5 because of its Google rating and availability: 5.0★ from 32 Google reviews, open 24/7.
Based in Vaughan, 24 km away
Ranked #6 because of its Google rating and availability: 5.0★ from 78 Google reviews, open 24/7.
Based in Richmond Hill, 6 km away
Ranked #7 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
Based in Toronto, 23 km away
Ranked #8 because of its Google rating and availability: 4.9★ from 77 Google reviews, open 24/7.
Based in North York, 25 km away
Ranked #9 because of its Google rating and availability: 4.8★ from 97 Google reviews, open 24/7.
Based in Mississauga, 42 km away
Ranked #10 because of its Google rating and availability: 5.0★ from 109 Google reviews, open 24/7.
Based in Mississauga, 44 km away
Ranked #11 because of its Google rating and availability: 5.0★ from 121 Google reviews, open 24/7.
Based in Toronto, 26 km away
Ranked #12 because of its Google rating and availability: 5.0★ from 51 Google reviews, open 24/7.
Based in Toronto, 27 km away
Ranked #13 because of its Google rating and availability: 5.0★ from 51 Google reviews, open 24/7.
Based in Mississauga, 46 km away
Ranked #14 because of its Google rating and availability: 5.0★ from 123 Google reviews, open 24/7.
Based in Mississauga, 43 km away
Ranked #15 because of its Google rating and availability: 4.9★ from 121 Google reviews, open 24/7.
Based in Toronto, 34 km away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 271 Google reviews, listed on Google as “Waterproofing service”.
Based in Mississauga, 39 km away
Ranked #17 because of its Google rating and availability: 5.0★ from 70 Google reviews, open 24/7.
Based in Toronto, 27 km away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 274 Google reviews, listed on Google as “Waterproofing service”.
Based in Etobicoke, 33 km away
Ranked #19 because of its Google rating and availability: 5.0★ from 50 Google reviews, open 24/7.
Based in North York, 27 km away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Waterproofing service”.
Based in East York, 18 km away
Ranked #21 because of its Google rating and trade focus: 4.8★ from 177 Google reviews, listed on Google as “Waterproofing service”.
Based in East Gwillimbury, 37 km away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 208 Google reviews, listed on Google as “Waterproofing service”.
Based in Mississauga, 46 km away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Waterproofing service”.
Based in Mississauga, 37 km away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 166 Google reviews, listed on Google as “Waterproofing service”.
Based in Markham
Ranked #25 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 335 ranked foundation repair companies here; the rest are on their profiles.
20 more foundation repair companies within 64 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| 2x4 Construction | In Markham | |
| Agc Pro Construction | 5.0★ (53) | In Markham |
| Apex & Co Inc. | In Markham | |
| Avanti Landscaping | 4.7★ (75) | In Markham |
| Basement Waterproofing Markham | 5.0★ (2) | In Markham |
| Best Value Contracting | 5.0★ (6) | In Markham |
| BTrust landscaping | 5.0★ (32) | In Markham |
| Concrete Markham | 5.0★ (1) | In Markham |
| Desa Contracting and Restoration | 4.9★ (67) | In Markham |
| Draintony | In Markham | |
| DrainWorks Plumbing Markham | In Markham | |
| East Home Renovation Inc. 东财建筑装修 | 5.0★ (69) | In Markham |
| Eco Star Home Services Co. | 4.7★ (490) | In Markham |
| First Base Construction inc. | 5.0★ (2) | In Markham |
| GBC Concrete Forming | 3.0★ (2) | In Markham |
| Handy Birds Services | 5.0★ (127) | In Markham |
| Lead Home Renovation | 3.7★ (6) | In Markham |
| Toronto Waterproofing Inc | In Markham | |
| True Concrete Contractors | 5.0★ (5) | In Markham |
| Werek Enterprises Inc. | 5.0★ (12) | In Markham |
US national ranges converted to CAD, not adjusted for Markham. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Foundation repair | CA$3,130 | CA$7,270 | CA$11,430 | Per project: typical range of customer-reported repairs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 335 Markham foundation repair companies on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Markham data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |