860 general contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Ontario: Groundworks, CR Score 61/100; 4.9★ from 135 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Cloud City Construction Inc., posts 24/7 hours; ranked #6 of 860.
Most-reviewed: Closet World - Southern California, 2,697 Google reviews at 4.7★, the most of 860 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
860 Ontario general contractors are ranked here by CR Score, from ten published factors. 63 are open 24/7, 348 open Saturdays and 207 open Sundays, based on posted hours. The median Google rating is 4.8★ across 860 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Groundworks | 61 | 4.9★ (135) | Ontario | Sat · Sun · Evenings | Overall |
| 2 | American West Home Inspection, Inc. | 60 | 5.0★ (179) | Beaumont, 11 mi away | Sat · Sun · Evenings | — |
| 3 | Closet World - Southern California | 60 | 4.7★ (2,697) | Whittier, 23 mi away | Sat · Sun · Evenings | Most reviews |
| 4 | WestCoast Pool Service and Repair | 59 | 5.0★ (145) | Upland, 4 mi away | Sat | — |
| 5 | Quality Conservation Services | 59 | 4.7★ (224) | Montclair, 4 mi away | — | — |
| 6 | Cloud City Construction Inc. | 58 | 5.0★ (20) | Chino, 5 mi away | 24/7 | Emergencies |
| 7 | USA Pro Service Inc GC, Air&Heat, Electric, | 58 | 4.9★ (38) | San Dimas, 9 mi away | 24/7 | — |
| 8 | Eagle Eye Home Services | 58 | 4.9★ (83) | Placentia, 17 mi away | 24/7 | — |
| 9 | Flawless Construction | 58 | 4.6★ (168) | Riverside, 17 mi away | 24/7 | — |
| 10 | SouthSTAR Construction | 57 | 5.0★ (67) | Corona, 13 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 4.9★ from 135 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Beaumont, 11 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 179 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Whittier, 23 mi away
Ranked #3 because of its Google rating and review volume: 4.7★ from 2,697 Google reviews, the most in Ontario.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Upland, 4 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 145 Google reviews, listed on Google as “Contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Montclair, 4 mi away
Ranked #5 because of its Google rating and trade focus: 4.7★ from 224 Google reviews, listed on Google as “Contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Chino, 5 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Dimas, 9 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 38 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Placentia, 17 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 83 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Riverside, 17 mi away
Ranked #9 because of its Google rating and trade focus: 4.6★ from 168 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Corona, 13 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 67 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Anaheim, 17 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 325 Google reviews, listed on Google as “Contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Glendora, 13 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 83 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Upland, 3 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Pomona, 6 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 11 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Koreatown, 11 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Covina, 14 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 52 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Upland, 2 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Anaheim, 17 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 501 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Glendora, 14 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in San Bernardino, 16 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 25 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Orange, 20 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 48 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ontario
Ranked #22 because of its Google rating and trade focus: 5.0★ from 46 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ontario
Ranked #23 because of its Google rating and trade focus: 4.6★ from 20 Google reviews, listed on Google as “Construction company”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Fontana, 13 mi away
Ranked #24 because of its Google rating and trade focus: 4.4★ from 414 Google reviews, listed on Google as “General contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Arcadia, 22 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 116 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency 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 860 ranked general contractors here; the rest are on their profiles.
20 more general contractors within 25 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 |
|---|---|---|
| Adelphi Home Remodeling | 4.6★ (29) | In Ontario |
| Beavers Plumbing & Rooter | 5.0★ (9) | In Ontario |
| Blues Glass Tinting | 4.9★ (75) | In Ontario |
| Calvillo Construction Corp | 4.5★ (13) | In Ontario |
| Diamond Air Services | 5.0★ (413) | In Ontario |
| Fullmer Construction | 4.8★ (18) | In Ontario |
| Granite & Cabinet Depot | 4.3★ (101) | In Ontario |
| Haven Cleaning | 4.7★ (66) | In Ontario |
| JJ Home Renovations | 5.0★ (10) | In Ontario |
| JMJ Remodeling Experts | 5.0★ (17) | In Ontario |
| KB Home Moonstone at Sunset Ranch | 4.8★ (10) | In Ontario |
| Kenyon Plastering | 3.4★ (10) | In Ontario |
| Land X Landscape Construction | 4.8★ (32) | In Ontario |
| Legend Construction Services Inc. | 5.0★ (15) | In Ontario |
| Ontario HVAC Solutions | 5.0★ (22) | In Ontario |
| Roto-Rooter Plumbing & Water Cleanup | 4.8★ (1,330) | In Ontario |
| Simple, Inc. | 5.0★ (12) | In Ontario |
| Superior Fence & Rail Inland Empire | 4.7★ (35) | In Ontario |
| United Water Restoration Group of Ontario | 4.9★ (71) | In Ontario |
| Zappa Deck Builders | 5.0★ (17) | In Ontario |
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Kitchen remodel | $15,240 | $28,190 | $43,470 | Per project: typical range of customer-reported remodels (about $75 to $250 per sq ft). US national range × 1.04 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
| Bathroom remodel | $7,050 | $12,880 | $18,720 | Per bathroom: typical range of customer-reported remodels. US national range × 1.06 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
In California, Contractors State License Board (CSLB) licenses B General Building contractor license (B-2 for residential remodeling).
Jobs of $1,000 or more in labor and materials (from January 1, 2025).
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
We scored 860 Ontario general contractors 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 |