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 Multi-Family ADUs* under California state law:
- CATEGORY ONE ADU: Conversion of existing non-habitable space located within portions of an existing Two-Family or Multi-Family Residential Facilities, such as storage rooms, boiler rooms, passageways, attics, basements or garages.
- CATEGORY TWO ADU: Construction of new detached structure(s) or conversion or rebuilt of existing detached structure(s) on lots with an existing Two-Family or Multi-Family Residential Facility. Conversion or rebuilt of existing detached accessory structure(s) involve no expansion of the existing building envelope(s).
- CATEGORY THREE ADU: Construction of a new or conversion of existing accessory structure attached to a primary Multifamily Residential Facility for the purpose of creating only one ADU on the lot. This type of ADU precludes creation of any other ADU types on the lot.
* Change of Occupancy regulations for the California Existing Building Code (CEBC) may apply when adding ADUs.
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.