All Accessory Dwelling Units (ADUs) require a Design Review Exemption (DRX) Permit from the Planning/Zoning Bureau, along with Building Permits.
Here are the categories of Single-Family ADUs under California state law:
- JUNIOR ADU (JADU): Involves conversion of space within the building envelope of an existing or proposed Single-Family dwelling, resulting in a living unit of not more than 500 sq. ft., requiring owner-occupancy in the JADU or primary dwelling unit.
- CATEGORY ONE ADU: Involves either conversion of space within an existing Single-Family Dwelling, or conversion or rebuild of an existing accessory structure; includes no expansion of the existing building envelope other than up to 150 sq. ft. for purposes of accommodating ADU access and egress only.
- CATEGORY TWO ADU: Involves construction of a new detached or attached structure, including an exterior addition to an existing structure to accommodate the ADU, in conjunction with a proposed or existing Single-Family dwelling.
Please note that a Category 1 OR a Category 2 ADU may be combined on the lot with one JADU. However, a lot may NOT contain both a Category 1 ADU and a Category 2 ADU. If a lot contains two ADUs, one must be a JADU.
IMPORTANT METERING UPDATE! Please note that separate utility meters may be required for your ADU as per California Public Utility Code (P.U.Code) Section 780.5. Please read our joint ADU bulletin with PG&E for details.
See below for step-by-step requirements to apply for your ADU permits or review our Guidebook to Single-Family ADUs.