59/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 733 Google reviews.
- 4.9★ from 733 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 445 Birch St, Lake Elsinore, CA 92530
Best Foundation Repair Companies in Ontario, CA (2026)
160 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Ontario: Dalinghaus Foundation Repair, CR Score 59/100; 4.9★ from 733 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Green Ladder Roofing and Waterproofing, posts 24/7 hours; ranked #2 of 160.
- 29
Most-reviewed: Saber, 1,011 Google reviews at 4.9★, the most of 160 ranked; ranked #29.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
160 Ontario foundation repair companies are ranked here by CR Score, from ten published factors. 22 are open 24/7, 106 open Saturdays and 59 open Sundays, based on posted hours. The median Google rating is 4.9★ across 160 rated businesses.
Top 10 foundation repair companies in Ontario at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Dalinghaus Foundation Repair | 59 | 4.9★ (733) | Lake Elsinore, 32 mi away | 24/7 | Overall |
| 2 | Green Ladder Roofing and Waterproofing | 58 | 5.0★ (258) | Pasadena, 28 mi away | 24/7 | Emergencies |
| 3 | Professional Foundation Repair | 57 | 4.9★ (216) | Garden Grove, 28 mi away | 24/7 | — |
| 4 | Groundworks | 57 | 4.9★ (135) | Ontario | Sat · Sun · Evenings | — |
| 5 | Pro-Seal Systems | 56 | 5.0★ (9) | Glendora, 13 mi away | Sat · Sun | — |
| 6 | Infinity Shower Pans | 56 | 5.0★ (17) | Whittier, 24 mi away | Sat · Sun · Evenings | — |
| 7 | Kaliber Roofing Inc | 55 | 4.8★ (82) | Montclair, 3 mi away | Sat · Sun · Evenings | — |
| 8 | Dalinghaus Foundation Repair | 55 | 5.0★ (53) | Irvine, 30 mi away | 24/7 | — |
| 9 | CBS Construction Services | 54 | 4.9★ (15) | Huntington Beach, 31 mi away | Sat · Sun · Evenings | — |
| 10 | Cabral Roofing & Waterproofing | 54 | 4.6★ (9) | San Dimas, 10 mi away | 24/7 | — |
The 160 best foundation repair companies in Ontario, ranked
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.
Based in Pasadena, 28 mi away
58/100CR ScoreRanked #2 because of its Google rating and review volume: 5.0★ from 258 Google reviews.
- 5.0★ from 258 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 155 N Lake Ave Suite 800,874, Pasadena, CA 91101
Based in Garden Grove, 28 mi away
57/100CR ScoreRanked #3 because of its Google rating and review volume: 4.9★ from 216 Google reviews.
- 4.9★ from 216 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7441 Anaconda Ave, Garden Grove, CA 92841
#4 Groundworks
Based in Ontario
57/100CR ScoreRanked #4 because of its Google rating and review volume: 4.9★ from 135 Google reviews.
- 4.9★ from 135 Google reviews
- Hours
- Mon–Fri 4 AM–8 PM · Sat 5 AM–8 PM · Sun 7 AM–8 PM
- Address
- 1850 S Parco Ave, Ontario, CA 91761
Based in Glendora, 13 mi away
56/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 9 Google reviews
- Hours
- Mon–Sun 8 AM–4 PM
- Address
- 307 S Vermont Ave # H, Glendora, CA 91741
Based in Whittier, 24 mi away
56/100CR ScoreRanked #6 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 17 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 14445 Tedford Dr, Whittier, CA 90604
Based in Montclair, 3 mi away
55/100CR ScoreRanked #7 because of its Google rating and review volume: 4.8★ from 82 Google reviews.
- 4.8★ from 82 Google reviews
- Hours
- Mon–Sat 6 AM–7 PM · Sun 9 AM–1 PM
- Address
- 11182 Poulsen Ave, Montclair, CA 91763
Based in Irvine, 30 mi away
55/100CR ScoreRanked #8 because of its Google rating and trade focus: 5.0★ from 53 Google reviews, listed on Google as “Concrete contractor”.
- 5.0★ from 53 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9891 Irvine Center Dr, Irvine, CA 92618
Based in Huntington Beach, 31 mi away
54/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.9★ from 15 Google reviews, listed on Google as “Waterproofing service”.
- 4.9★ from 15 Google reviews
- Hours
- Mon–Fri 6 AM–7 PM · Sat–Sun 8 AM–2 PM
- Address
- 15571 Producer Ln suite h, Huntington Beach, CA 92649
Based in San Dimas, 10 mi away
54/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Roofing contractor”.
- 4.6★ from 9 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 675 W Terrace Dr, San Dimas, CA 91773
Based in Glendora, 13 mi away
54/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 7 Google reviews
- Hours
- Mon–Sat 8 AM–5 PM · Sun closed
- Address
- 854 E Meda Ave, Glendora, CA 91741
#12 J P Roofing
Based in Chino, 5 mi away
54/100CR ScoreRanked #12 because of its Google rating and review volume: 4.9★ from 100 Google reviews.
- 4.9★ from 100 Google reviews
- Hours
- Mon–Fri 6 AM–4 PM · Sat 7 AM–5 PM · Sun closed
Based in Long Beach, 36 mi away
53/100CR ScoreRanked #13 because of its Google rating and review volume: 4.8★ from 705 Google reviews.
- 4.8★ from 705 Google reviews
- Hours
- Mon–Sun 8:30 AM–5 PM
- Address
- 1500 W Carson St Suite 201, Long Beach, CA 90810
Based in Adelanto, 16 mi away
53/100CR ScoreRanked #14 because of its Google rating and trade focus: 5.0★ from 19 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 19 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
Based in Glendora, 14 mi away
53/100CR ScoreRanked #15 because of its Google rating and availability: 5.0★ from 21 Google reviews, open 24/7.
- 5.0★ from 21 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1025 W Arrow Hwy, Glendora, CA 91740
#16 All Proof Decks
Based in Orange, 20 mi away
53/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 19 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 19 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat–Sun closed
- Address
- 820 W Fletcher Ave, Orange, CA 92865
#17 A R SHOWER PANS
Based in Canyon Lake, 35 mi away
53/100CR ScoreRanked #17 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 9 Google reviews
- Hours
- Mon–Sun 6 AM–11 PM
- Address
- 30240 Gulf Stream Dr, Canyon Lake, CA 92587
Based in Placentia, 17 mi away
52/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.3★ from 24 Google reviews, listed on Google as “Waterproofing service”.
- 4.3★ from 24 Google reviews
- Hours
- Mon–Fri 6 AM–4 PM · Sat–Sun closed
- Address
- 721 S Van Buren St, Placentia, CA 92870
#19 DK Shower Pans
Based in Norwalk, 26 mi away
52/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Waterproofing service”.
- 5.0★ from 10 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat 8 AM–12 PM · Sun closed
- Address
- 14006 Gracebee Ave, Norwalk, CA 90650
Based in Pomona, 6 mi away
52/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Siding contractor”.
- 4.3★ from 6 Google reviews
- Hours
- Mon–Sun 7 AM–9 PM
- Address
- 217 E Mission Blvd, Pomona, CA 91766
Based in Irvine, 30 mi away
52/100CR ScoreRanked #21 because of its Google rating and review volume: 4.8★ from 398 Google reviews.
- 4.8★ from 398 Google reviews
- Hours
- Mon–Fri 9 AM–5 PM · Sat–Sun closed
- Address
- 2649 Campus Dr, Irvine, CA 92612
Based in Corona, 14 mi away
52/100CR ScoreRanked #22 because of its Google rating and review volume: 4.7★ from 57 Google reviews.
- 4.7★ from 57 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 712 W 10th St, Corona, CA 92882
Based in Yorba Linda, 14 mi away
52/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 46 Google reviews, listed on Google as “Construction company”.
- 5.0★ from 46 Google reviews
- Hours
- Mon–Fri 7 AM–8 PM · Sat–Sun closed
- Address
- 22603 La Palma Ave, Yorba Linda, CA 92887
Based in Los Angeles, 31 mi away
52/100CR ScoreRanked #24 because of its Google rating and trade focus: 5.0★ from 16 Google reviews, listed on Google as “Roofing contractor”.
- 5.0★ from 16 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 231 N Record Ave, Los Angeles, CA 90063
#25 Horizon Roofing
Based in Irvine, 29 mi away
52/100CR ScoreRanked #25 because of its Google rating and review volume: 4.8★ from 59 Google reviews.
- 4.8★ from 59 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2030 Main St # 1300, Irvine, CA 92614
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 160 ranked foundation repair companies here; the rest are on their profiles.
Also serving Ontario
20 more foundation repair companies within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Dry Masters | 5.0★ (26) | In Ontario |
| Elemental Construction Co | 5.0★ (2) | In Ontario |
| Elite Construction Ontario | 5.0★ (5) | In Ontario |
| EverGreen Kitchen & Bathroom Remodeling Ontario | 5.0★ (18) | In Ontario |
| Foundation Construction | 5.0★ (1) | In Ontario |
| Garcon Construction, Inc. | 4.1★ (7) | In Ontario |
| Horizon Forge Construction LLC | 5.0★ (1) | In Ontario |
| Inland Design Build | In Ontario | |
| Innovate Construction Co | 5.0★ (1) | In Ontario |
| Lifestyle Renovation Inc. | 4.0★ (2) | In Ontario |
| Metrocell Construction, Inc | In Ontario | |
| Ontario General Contractors | 4.4★ (7) | In Ontario |
| Precision General Commercial Contractors, Inc. - Ontario Office | In Ontario | |
| RedRock Builders LLC | 5.0★ (4) | In Ontario |
| Royalty Plumbing and Drain | In Ontario | |
| Silver Creek Construction LLC | In Ontario | |
| Suncoast Post-Tension | 4.6★ (20) | In Ontario |
| Victory Builders Co | 5.0★ (1) | In Ontario |
| VLP Design Build | 5.0★ (16) | In Ontario |
| WH Jewett, Inc | 5.0★ (1) | In Ontario |
How much do foundation repair companies cost in Ontario?
National price ranges in USD, not adjusted for Ontario. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Foundation repair | $2,225 | $5,174 | $8,133 | Per project: typical range of customer-reported repairs. US national range | October 2026 |
How we ranked Ontario foundation repair companies
We scored 160 Ontario 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 Ontario 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 |
Foundation repair companies in Ontario: frequently asked questions
Who is the best foundation repair company in Ontario?
By CR Score, the highest-ranked foundation repair company in Ontario, CA is Dalinghaus Foundation Repair with a CR Score of 59/100. It has 4.9★ from 733 Google reviews. It is open 24/7. Green Ladder Roofing and Waterproofing (#2) and Professional Foundation Repair (#3) follow. We ranked 160 foundation repair companies on ten factors, last updated October 22, 2026.
How many foundation repair companies are there in Ontario?
ContractorsRanked ranks 160 foundation repair companies serving Ontario, CA. 1 of them is based in Ontario; the rest serve it from nearby towns. Another 20 within 40 mi are listed but not ranked yet. Counts are as of October 2026.
Which foundation repair companies in Ontario are open 24/7?
22 ranked foundation repair companies in Ontario post 24/7 hours. The highest-ranked are Dalinghaus Foundation Repair (#1), Green Ladder Roofing and Waterproofing (#2) and Professional Foundation Repair (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which foundation repair companies in Ontario work on weekends?
106 of 160 ranked foundation repair companies post Saturday hours and 59 post Sunday hours. The highest-ranked open Saturdays are Dalinghaus Foundation Repair (#1), Green Ladder Roofing and Waterproofing (#2) and Professional Foundation Repair (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does foundation repair cost in Ontario?
Foundation repair typically costs $2,225 to $8,133, with $5,174 typical (Per project: typical range of customer-reported repairs. US national range). This is a national range, not adjusted for Ontario. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Ontario foundation repair companies have?
The median Google rating among 160 rated foundation repair companies in Ontario is 4.9★, with a median of 15 reviews. Saber has the most, 1,011 reviews, and ranks #29. 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 ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do foundation repair companies outside Ontario count in this ranking?
Yes, if they are within 40 mi of the Ontario city center, 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 Ontario
- October 2026: CR Scores recalculated for 160 foundation repair companies serving Ontario.
More foundation repair companies and Ontario pages
Foundation repair companies near Ontario
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