195 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Thorold: Aquamaster Basement Waterproofing Mississauga, CR Score 86/100; 5.0★ from 123 Google reviews; open 24/7.
Best for emergencies (open 24/7): ROOTERWORX, posts 24/7 hours; ranked #2 of 195.
Most-reviewed: Rooter-Man Drain & Sewer Repair Services Toronto, 570 Google reviews at 4.8★, the most of 195 ranked; ranked #35.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
195 Thorold foundation repair companies are ranked here by CR Score, from 8 published factors. 79 are open 24/7, 156 open Saturdays and 112 open Sundays, based on posted hours. The median Google rating is 5.0★ across 195 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Aquamaster Basement Waterproofing Mississauga | 86 | 5.0★ (123) | Mississauga, 57 km away | 24/7 | Overall |
| 2 | ROOTERWORX | 86 | 5.0★ (121) | Mississauga, 58 km away | 24/7 | Emergencies |
| 3 | Aquatech Basement Waterproofing Mississauga | 86 | 5.0★ (109) | Mississauga, 59 km away | 24/7 | — |
| 4 | RCC Waterproofing Mississauga | 85 | 4.9★ (121) | Mississauga, 64 km away | 24/7 | — |
| 5 | RCC Waterproofing Stoney Creek | 85 | 4.8★ (41) | Burlington, 42 km away | 24/7 | — |
| 6 | Harris Waterproofing | 85 | 4.8★ (85) | Brant, 23 km away | Sat · Sun | — |
| 7 | Canada Waterproofers Oakville | 85 | 5.0★ (33) | Burlington, 47 km away | 24/7 | — |
| 8 | Canada Waterproofers | 85 | 5.0★ (316) | Mississauga, 62 km away | Sat · Sun · Evenings | — |
| 9 | RCC Waterproofing Oakville | 84 | 5.0★ (39) | Oakville, 54 km away | 24/7 | — |
| 10 | Royal Work Basement Waterproofing Hamilton | 84 | 5.0★ (132) | Hamilton, 48 km away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 in Thorold
Based in Mississauga, 57 km away
Ranked #1 because of its Google rating and availability: 5.0★ from 123 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 58 km away
Ranked #2 because of its Google rating and availability: 5.0★ from 121 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 59 km away
Ranked #3 because of its Google rating and availability: 5.0★ from 109 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 64 km away
Ranked #4 because of its Google rating and availability: 4.9★ from 121 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Burlington, 42 km away
Ranked #5 because of its Google rating and availability: 4.8★ from 41 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Brant, 23 km away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 85 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Burlington, 47 km away
Ranked #7 because of its Google rating and availability: 5.0★ from 33 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 62 km away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 316 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Oakville, 54 km away
Ranked #9 because of its Google rating and availability: 5.0★ from 39 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 48 km away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 132 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 50 km away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 143 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Toronto, 61 km away
Ranked #12 because of its Google rating and availability: 5.0★ from 51 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Etobicoke, 63 km away
Ranked #13 because of its Google rating and availability: 5.0★ from 50 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 46 km away
Ranked #14 because of its Google rating and availability: 4.5★ from 80 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Toronto, 63 km away
Ranked #15 because of its Google rating and availability: 5.0★ from 51 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Toronto, 60 km away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 274 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 64 km away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 161 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Mississauga, 64 km away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 166 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 54 km away
Ranked #19 because of its Google rating and availability: 5.0★ from 21 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 56 km away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 107 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines, 6 km away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 56 km away
Ranked #22 because of its Google rating and availability: 5.0★ from 23 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Buffalo, 36 km away
Ranked #23 because of its Google rating and availability: 5.0★ from 177 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Oakville, 55 km away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 84 Google reviews, listed on Google as “Waterproofing service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines, 8 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Waterproofing service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
#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 195 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 |
|---|---|---|
| All-Pro Waterproofing & Excavating Inc | In Thorold | |
| Basement walkouts Hamilton LTD | 5.0★ (1) | 57 km |
| Basement waterproofing | 5.0★ (1) | 57 km |
| Cecchini Plumbing | 5.0★ (1) | 30 km |
| Easy Mix Concrete | 1.0★ (2) | 54 km |
| Kyle Collins Waterproofing | In Thorold | |
| Neverwet Basement Waterproofing | 5.0★ (1) | 53 km |
| Post pro fence foundations | 5.0★ (1) | 53 km |
| RC Waterproofing | 5.0★ (1) | 54 km |
| Reska & Sons, Llc | 5.0★ (2) | 43 km |
| RJR Excavating | 5.0★ (2) | 16 km |
| Rooter-Man Plumbing & Waterproofing Thorold | In Thorold | |
| Sarge Roofing & Contracting | 5.0★ (2) | 55 km |
| Sealcraft Caulking | 5.0★ (1) | 61 km |
| Stone Foundations | 1.0★ (2) | 9 km |
| Theriault Forming Construction Ltd. | 5.0★ (1) | 42 km |
| TSN Lighthouse Ltd. | 5.0★ (2) | 57 km |
| Umbrella Waterproofing Plumbing & Drains | 5.0★ (1) | 58 km |
| VK pro Plumbing | 5.0★ (2) | 64 km |
| VMB Group | 5.0★ (1) | 61 km |
US national ranges converted to CAD, not adjusted for Thorold. 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 195 Thorold 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 Thorold 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 |