California

California ADUAllowed checks.

California has statewide ADU law, but city zoning, parcel facts, fire, utilities, and building code still control the filed permit.

Quick answer

California has statewide ADU law, but city zoning, parcel facts, fire, utilities, and building code still control the filed permit.

Official ADU and zoning sources 3 connected markets

State source posture

California HCD ADU guidance

California has statewide ADU law, but city zoning, parcel facts, fire, utilities, and building code still control the filed permit.

Los Angeles has a mature ADU rule path; verify parcel, zoning, setbacks, fire, and utility constraints before filing.

San Diego ADU eligibility starts with companion/junior unit rules plus zoning and parcel constraints.

San Jose has official ADU rules and a local permit workflow; parcel facts still control final eligibility.

Cite this page

Use this page as a public web reference, not an official agency record. The linked official source remains the final authority.

ADUAllowed. "California ADUAllowed | Official Source Routes". https://www.aduallowed.com/states/ca/. Reviewed Jun 2026. Source and citation notes