Find Top Garage Conversion Contractors in California

Garage conversions in California typically cost between $25,000 and $80,000 depending on size, finish level, and permits required. Full ADU conversions with plumbing, HVAC, and kitchen can run $50,000–$120,000 for a turnkey build. Simple conversions to a bedroom or office are on the lower end.

Yes. Virtually all garage conversions in California require building permits from your local planning and building department. California's ADU laws (AB 2221) have streamlined the process significantly, requiring cities to approve most applications within 60 days, but permits are still mandatory for all structural and utility work.

Yes! California's ADU laws strongly encourage garage-to-ADU conversions. Most cities must approve them with minimal restrictions. A converted garage ADU can be rented for additional income or used as a guest suite. Your contractor will handle permits, setback requirements, and all required inspections.

Most garage conversions take 4–12 weeks from permit approval to completion. A simple bedroom or office conversion may take 3–5 weeks. A full ADU buildout with plumbing, electrical, HVAC, and kitchen typically takes 10–16 weeks. Permit approval itself can add 4–8 weeks depending on your city.

An attached garage conversion shares at least one wall with your main home, making it easier to tie into existing plumbing and HVAC. A detached garage conversion is a standalone structure that functions as a fully independent unit with its own entrance — often preferred for rental ADUs since it offers more privacy.

Use our directory above to browse CSLB-licensed garage conversion contractors in your California city. Always verify their contractor license at cslb.ca.gov, check recent Google reviews, and get at least 3 written bids before signing any contract. Our featured contractors are pre-vetted and verified.