88/100CR Score
Ranked #1 because of its Google rating and trade focus: 5.0★ from 208 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 208 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 197 Main St, Schomberg, ON L0G 1T0
Best Foundation Repair Companies in Alliston, ON (2026)
223 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Alliston: Pro-Leak Solutions, CR Score 88/100; 5.0★ from 208 Google reviews; open 7 days a week.
- 3
Best for emergencies (open 24/7): RCC Waterproofing Toronto, posts 24/7 hours; ranked #3 of 223.
- 2
Most-reviewed: Groundworks, 1,412 Google reviews at 4.9★, the most of 223 ranked; ranked #2.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
223 Alliston foundation repair companies are ranked here by CR Score, from 8 published factors. 86 are open 24/7, 185 open Saturdays and 142 open Sundays, based on posted hours. The median Google rating is 5.0★ across 223 rated businesses.
Top 10 foundation repair companies in Alliston at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Pro-Leak Solutions | 88 | 5.0★ (208) | East Gwillimbury, 22 km away | Sat · Sun · Evenings | Overall |
| 2 | Groundworks | 88 | 4.9★ (1,412) | East Gwillimbury, 50 km away | Sat · Sun · Evenings | Most reviews |
| 3 | RCC Waterproofing Toronto | 88 | 4.8★ (634) | Toronto, 61 km away | 24/7 | Emergencies |
| 4 | RCC Waterproofing Vaughan | 88 | 4.9★ (180) | Concord, 48 km away | 24/7 | — |
| 5 | PH Group | 87 | 4.8★ (49) | Angus, 22 km away | 24/7 | — |
| 6 | Aquamaster Basement Waterproofing Barrie | 87 | 5.0★ (93) | Barrie, 47 km away | 24/7 | — |
| 7 | Aquatech Waterproofing | 87 | 5.0★ (78) | Vaughan, 45 km away | 24/7 | — |
| 8 | Aquatech Basement Waterproofing Toronto | 86 | 5.0★ (655) | Toronto, 61 km away | Sat · Sun · Evenings | — |
| 9 | RCC Waterproofing North York | 86 | 4.9★ (77) | Toronto, 50 km away | 24/7 | — |
| 10 | Stay Dry Waterproofing | 85 | 4.8★ (97) | North York, 53 km away | 24/7 | — |
The 223 best foundation repair companies in Alliston, ranked
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.
#2 Groundworks
Based in East Gwillimbury, 50 km away
88/100CR ScoreRanked #2 because of its Google rating and review volume: 4.9★ from 1,412 Google reviews, the most Google reviews on this list (1,412).
- 4.9★ from 1,412 Google reviews
- Hours
- Mon–Fri 7 AM–11 PM · Sat 8 AM–11 PM · Sun 10 AM–11 PM
- Address
- 12029 McCowan Rd, Whitchurch-Stouffville, ON L4A 7X5
Based in Toronto, 61 km away
88/100CR ScoreRanked #3 because of its Google rating and availability: 4.8★ from 634 Google reviews, open 24/7.
- 4.8★ from 634 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 129 Lytton Blvd, Toronto, ON M4R 1L5
Based in Concord, 48 km away
88/100CR ScoreRanked #4 because of its Google rating and availability: 4.9★ from 180 Google reviews, open 24/7.
- 4.9★ from 180 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7140 Islington Ave, Woodbridge, ON L4L 1V9
#5 PH Group
Based in Angus, 22 km away
87/100CR ScoreRanked #5 because of its Google rating and availability: 4.8★ from 49 Google reviews, open 24/7.
- 4.8★ from 49 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2580 Sunnidale Rd, Utopia, ON L0M 1T0
Based in Barrie, 47 km away
87/100CR ScoreRanked #6 because of its Google rating and availability: 5.0★ from 93 Google reviews, open 24/7.
- 5.0★ from 93 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Vaughan, 45 km away
87/100CR ScoreRanked #7 because of its Google rating and availability: 5.0★ from 78 Google reviews, open 24/7.
- 5.0★ from 78 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 15 Galloway Dr, Vaughan, ON L4L 7J4
Based in Toronto, 61 km away
86/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 655 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 655 Google reviews
- Hours
- Mon–Sun 7 AM–12 AM
- Address
- 20 Hyde Ave, Toronto, ON M6M 1J3
Based in Toronto, 50 km away
86/100CR ScoreRanked #9 because of its Google rating and availability: 4.9★ from 77 Google reviews, open 24/7.
- 4.9★ from 77 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4101 Steeles Ave W, Toronto, ON M3N 2H4
Based in North York, 53 km away
85/100CR ScoreRanked #10 because of its Google rating and availability: 4.8★ from 97 Google reviews, open 24/7.
- 4.8★ from 97 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 168A Oakdale Rd Unit 7, North York, ON M3N 1V9
Based in Mississauga, 59 km away
85/100CR ScoreRanked #11 because of its Google rating and availability: 5.0★ from 70 Google reviews, open 24/7.
- 5.0★ from 70 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1251-A Kamato Rd, Mississauga, ON L4W 2M2
Based in Barrie, 27 km away
85/100CR ScoreRanked #12 because of its Google rating and availability: 5.0★ from 11 Google reviews, open 24/7.
- 5.0★ from 11 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in North York, 50 km away
85/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 245 Google reviews, listed on Google as “Waterproofing service”.
- 4.9★ from 245 Google reviews
- Hours
- Mon–Sun 6 AM–11 PM
- Address
- 60 Millwick Dr, North York, ON M9L 1Y3
Based in Toronto, 59 km away
85/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 271 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 271 Google reviews
- Hours
- Mon–Fri 8 AM–9 PM · Sat 8 AM–7 PM · Sun 8 AM–8 PM
- Address
- 4 Faversham Crescent, Toronto, ON M9C 3X4
#15 Barrie HP
Based in Barrie, 27 km away
84/100CR ScoreRanked #15 because of its Google rating and availability: 5.0★ from 9 Google reviews, open 24/7.
- 5.0★ from 9 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Richmond Hill, 51 km away
84/100CR ScoreRanked #16 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
- 5.0★ from 30 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Barrie, 28 km away
84/100CR ScoreRanked #17 because of its Google rating and availability: 4.5★ from 16 Google reviews, open 24/7.
- 4.5★ from 16 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Markham, 52 km away
84/100CR ScoreRanked #18 because of its Google rating and availability: 5.0★ from 32 Google reviews, open 24/7.
- 5.0★ from 32 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 15 Allstate Pkwy 6th Floor, Markham, ON L3R 5B4
Based in Etobicoke, 64 km away
84/100CR ScoreRanked #19 because of its Google rating and availability: 5.0★ from 50 Google reviews, open 24/7.
- 5.0★ from 50 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 41 Advance Rd Suite 200, Etobicoke, ON M8Z 2S6
Based in Brampton, 53 km away
84/100CR ScoreRanked #20 because of its Google rating and availability: 4.9★ from 33 Google reviews, open 24/7.
- 4.9★ from 33 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 94 Jessie St, Brampton, ON L6Y 1L7
Based in Mississauga, 63 km away
83/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 166 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 166 Google reviews
- Hours
- Mon–Fri 7 AM–8:30 PM · Sat 8 AM–6 PM · Sun 10 AM–3 PM
- Address
- 3200 Wharton Way, Mississauga, ON L4X 2C1
Based in Barrie, 23 km away
83/100CR ScoreRanked #22 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
- 5.0★ from 30 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Barrie, 28 km away
83/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 30 Google reviews
- Hours
- Mon–Sun 7 AM–7 PM
Based in Keswick, 34 km away
83/100CR ScoreRanked #24 because of its Google rating and availability: 5.0★ from 97 Google reviews, open 24/7.
- 5.0★ from 97 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45 Kyle Crescent, Keswick, ON L4P 3P6
Based in Mississauga, 64 km away
83/100CR ScoreRanked #25 because of its Google rating and trade focus: 5.0★ from 161 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 161 Google reviews
- Hours
- Mon–Sat 7 AM–9 PM · Sun 8 AM–9 PM
- Address
- 3453 Cedar Creek Dr, Mississauga, ON L4Y 2Y2
Foundation repair companies ranked #26 to #50
#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 223 ranked foundation repair companies here; the rest are on their profiles.
Also serving Alliston
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 In One Contractors Inc. | 5.0★ (8) | In Alliston |
| Alpha Flooring | 5.0★ (3) | In Alliston |
| Capstone Renovations Inc. | 4.9★ (17) | In Alliston |
| DLG Plumbing | 5.0★ (33) | In Alliston |
| Doma Interiors | 5.0★ (4) | In Alliston |
| Integrity Plumbing Services | 5.0★ (4) | In Alliston |
| JJ Glass & Mirror | 5.0★ (15) | In Alliston |
| Kraly Construction | 5.0★ (13) | In Alliston |
| Liftec Slabjacking Inc | 4.9★ (19) | In Alliston |
| LUDA Contracting Ltd | 4.6★ (9) | In Alliston |
| Morrison Electrical Services Ltd. | 4.9★ (22) | In Alliston |
| New Tec Kitchen and Beyond Inc. | 4.9★ (29) | In Alliston |
| Peter Rock Concrete | 5.0★ (35) | In Alliston |
| PHD Plumbing and Drain well service | 4.8★ (412) | In Alliston |
| Previn Court Homes | 4.3★ (31) | In Alliston |
| SGM MECHANICAL | 3.4★ (5) | In Alliston |
| SS Drywall and Taping | 5.0★ (22) | In Alliston |
| Strong's Septic Service Inc | 4.4★ (21) | In Alliston |
| True Craft Plumbing INC | 4.7★ (27) | In Alliston |
| Van Leeuwen Plumbing | 4.3★ (30) | In Alliston |
How much do foundation repair companies cost in Alliston?
US national ranges converted to CAD, not adjusted for Alliston. 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 |
How we ranked Alliston foundation repair companies
We scored 223 Alliston 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 Alliston 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 |
Foundation repair companies in Alliston: frequently asked questions
Who is the best foundation repair company in Alliston?
By CR Score, the highest-ranked foundation repair company in Alliston, ON is Pro-Leak Solutions with a CR Score of 88/100. It has 5.0★ from 208 Google reviews. It is open 7 days a week. Groundworks (#2) and RCC Waterproofing Toronto (#3) follow. We ranked 223 foundation repair companies on 8 factors, last updated October 22, 2026.
How many foundation repair companies are there in Alliston?
ContractorsRanked ranks 223 foundation repair companies serving Alliston, ON. Another 20 within 64 km are listed but not ranked yet. Counts are as of October 2026.
Which foundation repair companies in Alliston are open 24/7?
86 ranked foundation repair companies in Alliston post 24/7 hours. The highest-ranked are RCC Waterproofing Toronto (#3), RCC Waterproofing Vaughan (#4) and PH Group (#5). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which foundation repair companies in Alliston work on weekends?
185 of 223 ranked foundation repair companies post Saturday hours and 142 post Sunday hours. The highest-ranked open Saturdays are Pro-Leak Solutions (#1), Groundworks (#2) and RCC Waterproofing Toronto (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does foundation repair cost in Alliston?
Foundation repair typically costs CA$3,130 to CA$11,430, with CA$7,270 typical (Per project: typical range of customer-reported repairs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)). This is a national range, not adjusted for Alliston. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Alliston foundation repair companies have?
The median Google rating among 223 rated foundation repair companies in Alliston is 5.0★, with a median of 20 reviews. Groundworks has the most, 1,412 reviews, and ranks #2. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank foundation repair companies?
Each foundation repair company gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do foundation repair companies outside Alliston count in this ranking?
Yes, if they are within 64 km of the Alliston city centre, our service radius for foundation repair companies. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Update log for Alliston
- October 2026: CR Scores recalculated for 223 foundation repair companies serving Alliston.
- October 2026: 1 duplicate listing merged.
More foundation repair companies and Alliston pages
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