Cost of Garage Conversion in Ontario, CA — 2026 Price Guide
Ontario, a San Bernardino County community of 175,265 in the Southern California, has its own set of considerations when it comes to garage conversion. In 2026, the typical cost runs about $32,900 per conversion, though prices can vary. Here's everything you need to know.
2026 Garage Conversion Cost in Ontario, CA
| Cost Level | Price (per conversion) | What to Expect |
|---|---|---|
| Budget / Low-End | $14,100 | Basic scope, standard materials, smaller projects |
| Average / Mid-Range | $32,900 | Typical project scope with quality materials |
| Premium / High-End | $75,200 | Large scope, premium materials, complex projects |
Prices are estimates for Ontario, CA in 2026 and reflect local market conditions in San Bernardino County County. Your actual cost will depend on the specifics of your project.
Factors That Affect Garage Conversion Cost in Ontario
No two garage conversion projects in Ontario are identical. Here are the key cost drivers.
- Size of the garage
- Whether it's a permitted ADU or basic conversion
- Plumbing requirements (bathroom, kitchen)
- HVAC and electrical upgrades needed
- Insulation and weatherproofing requirements
- Flooring, walls, and ceiling finishes
- Window and door additions
What Ontario Homeowners Should Know
Garage Conversion projects in Ontario typically require a permit from San Bernardino County. Your contractor should handle the permit application.
Always verify your Ontario garage conversion contractor's CSLB license at cslb.ca.gov before signing a contract.
How to Save Money on Garage Conversion in Ontario
Getting the best deal on garage conversion in Ontario comes down to timing, preparation, and knowing what to ask.
- Check California ADU incentive and financing programs
- Keep the existing slab to reduce foundation costs
- Choose standard finishes over premium materials
- Get pre-approved plans for faster permitting
- Consider a junior ADU for lower costs and simpler permits
Frequently Asked Questions
How much does garage conversion cost in Ontario, CA?
The average cost of garage conversion in Ontario is approximately $32,900 per conversion in 2026. Prices range from $15,000 to $80,000 depending on project scope.
How long does garage conversion take in Ontario?
Most garage conversion projects in Ontario take 4-12 weeks to complete. Factors like project complexity and weather in San Bernardino County can affect the schedule.
Do I need a permit for garage conversion in Ontario?
Yes, garage conversion projects in Ontario typically require a permit from San Bernardino County.
How do I choose a garage conversion contractor in Ontario?
Get at least three quotes from Ontario contractors, verify their CSLB license, check reviews, and never pay more than 10% or $1,000 upfront.
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