Updated October 2026 · Our Recommended Top 17
Our goal is to connect people with the best local professionals. We scored Ontario general contractors on more than 25 variables across five categories and analyzed the results to give you a hand-picked list of the best.
= Featured Provider
Best General Contractor matching for Ontario
Not sure which general contractor to call? Tell us the job. We check the shortlist above against your timeline and budget and connect you with the right one, free.
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Best General Contractors Serving Ontario
9360 Base Line Rd Ste H, Rancho Cucamonga, CA 91701
Review sources · Google 5.0 (143)
Best General Contractors Serving Ontario
552 W Baseline Rd, Claremont, CA 91711
Review sources · Google 5.0 (112)
Best General Contractors Serving Ontario
1529 W 13th St Ste H, Upland, CA 91786
Review sources · Google 5.0 (33)
Review sources · Google 5.0 (20)
Best General Contractors Serving Ontario
1909 S Cypress Ave, Ontario, CA 91762
Review sources · Google 5.0 (12)
Review sources · Google 4.8 (12)
Best General Contractors Serving Ontario
855 Chestnut St, Ontario, CA 91762
Review sources · Google 5.0 (5)
Review sources · Google 5.0 (6)
Review sources · Google 5.0 (2)
Best General Contractors Serving Ontario
3281 E Guasti Rd Ste 700, Ontario, CA 91761
Review sources · Google 4.5 (8)
Best General Contractors Serving Ontario
829 S San Antonio Ave, Ontario, CA 91762
Review sources · Google 5.0 (13)
Review sources · Google 4.8 (18)
Best General Contractors Serving Ontario
3633 Inland Empire Blvd Ste 460, Ontario, CA 91764
Review sources · Google 4.2 (5)
Best General Contractors Serving Ontario
3030 E Riverside Dr, Ontario, CA 91761
Review sources · Google 5.0 (2)
Best General Contractors Serving Ontario
1150 N Hellman Ave, Ontario, CA 91764
Review sources · Google 3.6 (5)
Review sources · Google 5.0 (1)
Best General Contractors Serving Ontario
3929 E Guasti Rd Unit B, Ontario, CA 91761
Review sources · Google 5.0 (1)
We pull every general contractor we can find serving Ontario, then score each on five things: availability and service area, licensing and credentials, reputation across review sites, experience, and how they handle a real phone call. Only the top scorers make the list. Featured Providers pay for placement and are labeled; scores are never for sale.
Yes. Call or send the form and we match you with a general contractor from this list at no cost. Featured Providers may pay RatingsMatch for placement, which is why they are labeled.
Listings are earned, not bought. Claim your business at https://www.ratingsmatch.com/claim to correct details and add services. Featured placement is a separate paid option that never changes a rating.