What is the maximum size for an ADU in Oakland?

Detached ADUs in Oakland can be up to 1,200 square feet. Junior ADUs (JADUs) created within the primary dwelling are limited to 500 square feet.

How long does the ADU permit process take in Oakland?

Oakland must process a complete ADU application within 60 days under California state law. The review is ministerial, requiring no public hearing.

Are there special ADU requirements for Oakland hillside properties?

Yes. Properties in the Wildfire Prevention District or hillside areas may need to meet additional fire safety standards, including fire-resistant construction materials and defensible space requirements, which can affect ADU design and placement.

ADU Rules in Oakland

Oakland supports ADU construction under California's statewide framework (AB 68, SB 13, AB 881, AB 2221) with local implementation through the Planning & Building Department.

Permitted ADU Types

Detached ADU: A standalone accessory structure, up to 1,200 sq ft
Attached ADU: An addition to the primary dwelling, up to 1,200 sq ft
Junior ADU (JADU): A unit within the existing primary dwelling footprint, up to 500 sq ft
Garage Conversion: Conversion of an existing garage or accessory structure into a living unit

You may build both a full ADU and a JADU on a single-family residential lot.

Size and Dimensional Standards

Standard	Requirement
Maximum ADU Size	1,200 sq ft
Maximum Height	16 ft (detached)
Rear Setback	4 ft
Side Setback	4 ft
Front Setback	Per underlying zone

Parking Requirements

No additional parking is required for ADUs within half a mile of public transit, which encompasses much of Oakland given its extensive BART and AC Transit coverage. Where required, the maximum is one space per ADU. Garage conversions do not trigger replacement parking requirements.

Permit Process

Pre-application review: Optional consultation with Planning & Building staff
Application submittal: Submit plans through the city's online permit portal or in person
Ministerial review: 60-day review timeline for complete applications
Building permit issuance: Once planning approval is granted, obtain construction permits
Inspections and occupancy: Complete required inspections to receive certificate of occupancy

Fees

ADUs under 750 sq ft are exempt from impact fees per state law. Larger ADUs are subject to proportional impact fees. Oakland also offers fee waivers and incentives for affordable ADU programs -- check with the Planning Department for current offerings.

Key Regulations

Owner occupancy is not required under current state law
Short-term rentals (under 30 days) of ADUs are prohibited
ADUs cannot be sold separately from the primary dwelling unless specific conditions under AB 1033 are met
Properties in the Wildfire Prevention District must comply with additional fire-safety construction standards
No fire sprinklers required if the primary dwelling does not have them

ADU Rules in Oakland, California