Researched by Directory Ventures Editorial Team · Last updated April 22, 2026
Compare 19 top-rated general contractors professionals in Ontario. Read real reviews, check credentials, and get free quotes.
Looking for top-rated general contractors in Ontario, CA? Our directory features 19 general contractors professionals serving the Ontario metro area,with an average rating of 4.7 stars from 196 Google reviews.
General contractors should be licensed, bonded, and insured in your state. Look for those with strong Google ratings and reviews on projects similar in scope to yours. Request a list of three recent references and follow up — GC quality is highly project-specific.
General contractors typically mark up subcontractor work 10–20% and charge for project management. Kitchen remodels run $30,000–$80,000+; bathroom remodels $15,000–$40,000; room additions $150–$350 per square foot. Get three detailed written bids before selecting.
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Listed businesses are shown on merit — no pay-to-rank. Contact any general contractors professional directly.
*Estimates based on Ontario area averages. Get a personalized quote above.
Kitchen remodels typically take 4–8 weeks. Bathroom remodels take 2–4 weeks. Room additions take 2–4 months. Custom homes take 6–18 months. Timelines depend heavily on permit wait times and subcontractor availability.
Ask for their license number, proof of insurance (general liability + workers' comp), who specifically does the work (subs vs. in-house crew), their permit-pulling process, payment schedule, and how they handle change orders.
All listings are sourced from Google Business Profiles and ranked by real Google ratings and review volume. Confirm contractor licensing with your state board, verify insurance certificates, and check BBB complaint history independently before signing.
Document all issues with photos and written records. Send a formal demand letter invoking the contract terms. File with your state contractor licensing board and consider a mechanics lien if payment was made and work was not completed. Consult a construction attorney for significant disputes.
Looking for general contractors providers outside Ontario? Browse top-rated pros in these CA cities.