Permits explained: when you need them and how to get them
Most remodeling projects in California need a building permit. Your contractor should pull permits - if they suggest skipping, that's a red flag.
When do I need a building permit in California?
You need a permit for: any structural changes (removing/adding walls, windows, doors), electrical work (new circuits, panel upgrades, rewiring), plumbing work (moving fixtures, adding lines), HVAC changes, roofing replacement, water heater replacement, additions and ADUs, and any work valued over $500 that changes the structure or systems of your home. You typically do NOT need a permit for: painting, flooring replacement (cosmetic), cabinet refacing (not replacement), fixture replacement in the same location, landscaping (unless grading), and minor repairs. When in doubt, call your city's building department - they'll tell you if a permit is required.
Should my contractor pull the permits or should I?
Your contractor should pull the permits in their name and license number. This is important because: the contractor assumes responsibility for code-compliant work, their license and bond back the work, if something goes wrong, the CSLB can hold them accountable, and it proves the contractor is licensed and insured. If a contractor suggests that YOU pull the permits, or that they'll work under a 'homeowner permit,' that's a red flag. It often means they're trying to avoid accountability or their license may not be in good standing. An owner-builder permit shifts all liability to you.
What happens if work is done without a permit?
Unpermitted work creates several serious problems: (1) When selling your home, the buyer's inspection will likely reveal unpermitted work, which can kill a deal or require expensive remediation. (2) Your homeowner's insurance may not cover damage caused by or related to unpermitted work. (3) If the work doesn't meet code and causes injury or damage, you're liable. (4) The city can issue fines and require you to retroactively permit the work - which may mean opening walls for inspection or even demolishing non-compliant work. (5) Unpermitted additions don't count toward your home's official square footage. To fix existing unpermitted work, contact your city building department about their retroactive permit process.
Related guides in Project Planning
Typical timeline: 2-3 weeks for design/permits, 1 week demo, 2-3 weeks rough, 2-3 weeks finish. Total: 6-12 weeks.
Budget $15,000-50,000 for a mid-range bathroom remodel. Waterproofing is critical - don't let your contractor skip it.
California allows ADUs on most residential lots. Typical cost: $150,000-350,000 for a detached ADU.
Ready to compare your contractor estimates?
Upload estimates and get AI-powered analysis with CSLB license verification. Free.
Compare My Estimates →