Are ADUs legal in California?
Yes — California permits ADUs by-right statewide per SB 9 (2021), AB 2221 (2022), SB 1069 (2016). Every qualifying municipality must allow at least one ADU pathway on eligible single-family lots.
What are the size limits on an ADU in California?
California permits ADUs up to approximately 1200 square feet per SB 9 (2021), AB 2221 (2022), SB 1069 (2016). Individual municipalities may set lower caps; verify with your city or county planning department before ordering.
Do I need a permit for an ADU in California?
Yes — every ADU in California requires a building permit issued by the city or county. The permit process typically runs 60-120 days depending on jurisdiction, complexity, and whether discretionary review is triggered.
Can I rent out my ADU in California?
Yes — long-term rental of an ADU is generally permitted in California. Short-term rental (Airbnb / VRBO under 30 days) is subject to municipal registration and may require additional permits.
Does California require owner-occupancy on the primary residence when I have an ADU?
No — California does not require owner-occupancy under state statute per SB 9 (2021), AB 2221 (2022), SB 1069 (2016). Local ordinances may still add owner-occupancy requirements in specific cities.
What zoning districts allow ADUs in California?
Most California municipalities permit ADUs in single-family residential zones (R-1, R-2 equivalent). California SB 9 (2021) and AB 2221 (2022) locked by-right ADU pathways across every California municipality. Up to two ADUs per single-family lot with limited discretionary review. Consult your city zoning code for the specific district table.
How long does an ADU permit take in California?
Typical ADU permit timelines in California run 60-120 days from application to approval. Fast-permitting counties can move in under 30 days; metro-core jurisdictions with discretionary review can extend to 150+ days.
Are there setback requirements for an ADU in California?
Yes — most California municipalities apply the same setback requirements to ADUs that apply to the primary structure (typically 5-10 feet rear and side, 15-25 feet front). Some cities apply reduced setbacks specifically for detached ADUs. Verify with your city zoning code.
Can I finance an ADU purchase in California?
Yes — several financing pathways cover ADU purchases in California: Fannie Mae HomeStyle Renovation, FHA 203(k), construction-to-perm loans, HELOC on the primary residence, and cash. Check with modular-friendly lenders like 21st Mortgage, Cascade Financial, and Triad Financial for the California-specific product.
What's the difference between an ADU and a JADU in California?
A JADU (Junior Accessory Dwelling Unit) is a smaller unit created within the existing footprint of the primary residence — typically up to 500 sqft with a small kitchen and shared bath. California SB 1069 (2016) codified the JADU category; you can have one ADU + one JADU on the same lot.