241 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Oshawa: Groundworks, CR Score 63/100; 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 #3 of 241.
Most-reviewed: Aquatech Basement Waterproofing Toronto, 655 Google reviews at 5.0★, the most of 241 ranked after Groundworks; ranked #7.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
241 Oshawa foundation repair companies are ranked here by CR Score, from ten published factors. 96 are open 24/7, 200 open Saturdays and 148 open Sundays, based on posted hours. The median Google rating is 5.0★ across 241 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Groundworks | 63 | 4.9★ (1,412) | East Gwillimbury, 37 km away | Sat · Sun · Evenings | Overall |
| 2 | Durham Backhoe Basement Waterproofing | 62 | 5.0★ (67) | Oshawa | Sat · Sun · Evenings | — |
| 3 | RCC Waterproofing Toronto | 61 | 4.8★ (634) | Toronto, 49 km away | 24/7 | Emergencies |
| 4 | Aquaphobia Foundation Repair & Crack Injections | 61 | 5.0★ (102) | Cobourg, 14 km away | Sat · Sun · Evenings | — |
| 5 | Aquatech Basement Waterproofing Oshawa | 61 | 5.0★ (49) | Oshawa | Sat · Sun · Evenings | — |
| 6 | Call the Plumbing Doctor Inc. & Call the Foundation Doctor Inc. | 60 | 4.8★ (182) | Oshawa | 24/7 | — |
| 7 | Aquatech Basement Waterproofing Toronto | 60 | 5.0★ (655) | Toronto, 56 km away | Sat · Sun · Evenings | Most reviews |
| 8 | RCC Waterproofing Vaughan | 59 | 4.9★ (180) | Concord, 60 km away | 24/7 | — |
| 9 | Aquamaster Basement Waterproofing Toronto | 59 | 4.9★ (274) | Toronto, 52 km away | Sat · Sun · Evenings | — |
| 10 | City Wide Group | 58 | 4.8★ (177) | East York, 43 km away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 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 Oshawa
Ranked #2 because of its Google rating and trade focus: 5.0★ from 67 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 49 km away
Ranked #3 because of its Google rating and trade focus: 4.8★ from 634 Google reviews, listed on Google as “Waterproofing service”.
Based in Cobourg, 14 km away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 102 Google reviews, listed on Google as “Foundation”.
Based in Oshawa
Ranked #5 because of its Google rating and trade focus: 5.0★ from 49 Google reviews, listed on Google as “Waterproofing service”.
Based in Oshawa
Ranked #6 because of its Google rating and review volume: 4.8★ from 182 Google reviews.
Based in Toronto, 56 km away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 655 Google reviews, listed on Google as “Waterproofing service”.
Based in Concord, 60 km away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 180 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 52 km away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 274 Google reviews, listed on Google as “Waterproofing service”.
Based in East York, 43 km away
Ranked #10 because of its Google rating and trade focus: 4.8★ from 177 Google reviews, listed on Google as “Waterproofing service”.
Based in Oshawa
Ranked #11 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Waterproofing service”.
Based in Ajax, 7 km away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 19 Google reviews, listed on Google as “Waterproofing service”.
Based in Oshawa
Ranked #13 because of its Google rating and trade focus: 4.5★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 64 km away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 271 Google reviews, listed on Google as “Waterproofing service”.
Based in Oshawa
Ranked #15 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Waterproofing service”.
Based in Vaughan, 58 km away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 78 Google reviews, listed on Google as “Waterproofing service”.
Based in Richmond Hill, 39 km away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Waterproofing service”.
Based in North York, 59 km away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Waterproofing service”.
Based in Markham, 42 km away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 32 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 56 km away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 77 Google reviews, listed on Google as “Waterproofing service”.
Based in North York, 57 km away
Ranked #21 because of its Google rating and trade focus: 4.8★ from 97 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 52 km away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Waterproofing service”.
Based in Toronto, 54 km away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Waterproofing service”.
Based in Oshawa
Ranked #24 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “Waterproofing service”.
Based in Ajax, 48 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 29 Google reviews, listed on Google as “Waterproofing service”.
#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 241 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 |
|---|---|---|
| A & A Home Repair Services & Renovations | 4.7★ (14) | In Oshawa |
| Andy Crown Construction Co. | 1.8★ (4) | In Oshawa |
| Bright renovation & janitorial service | 5.0★ (4) | In Oshawa |
| Building Problems Solver Inc. | 5.0★ (23) | In Oshawa |
| Central Drain Service Inc. | 4.9★ (34) | In Oshawa |
| Cornerstone Construction | 4.6★ (20) | In Oshawa |
| DMJ Construction & Renovation | 4.8★ (25) | In Oshawa |
| Dynamic Brick and Stone Ltd | 5.0★ (17) | In Oshawa |
| Fire Beard Contracting | 5.0★ (29) | In Oshawa |
| Hamkar group | 3.7★ (3) | In Oshawa |
| Henley Contracting Ltd. | 4.8★ (50) | In Oshawa |
| Hickory Dickory Decks Clarington | 5.0★ (9) | In Oshawa |
| KDM Construction | 5.0★ (4) | In Oshawa |
| Level General Contracting Inc. | 5.0★ (5) | In Oshawa |
| ListWell Inc | 5.0★ (9) | In Oshawa |
| Quantum Contracting Limited | 5.0★ (11) | In Oshawa |
| Samar Masonry Construction Oshawa, Courtice & Bowmanville | 5.0★ (7) | In Oshawa |
| Signatureone contracting | 5.0★ (5) | In Oshawa |
| Solid Seal Concrete Medics | 5.0★ (4) | In Oshawa |
| Zacho construction & landscaping | 4.7★ (3) | In Oshawa |
US national ranges converted to CAD, not adjusted for Oshawa. 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 241 Oshawa foundation repair companies on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Oshawa data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |