City · California

ADU rules in Oakland

4 sources

These are the primary sources for accessory dwelling unit regulations in Oakland: the city's own zoning code, planning department pages, and permit guides. Start here before talking to anyone: the rules below are what your permit reviewer will apply.

Rules at a glance

Detached (backyard) ADU

Allowed

Category Two ADUs are new attached or detached structures, allowed on one-family lots (1 per lot) and on two- to four-family and multifamily lots (up to 8 detached per lot on existing multifamily facilities, 2 on proposed ones). Prohibited in the S-9 fire zone except via narrow exceptions.

Oakland Planning Code 17.103.080(B) Table 17.103.01 and 17.103.080(C) Table 17.103.02; 17.88.050(A)(3)

Attached or internal ADU

Allowed

Attached Category Two ADUs allowed on one-family lots; Category One interior conversions and JADUs allowed within the existing envelope; multifamily buildings may also add one attached Category Three ADU (but then no other ADUs on the lot).

Oakland Planning Code 17.103.080(B) Table 17.103.01 and 17.103.080(C) Table 17.103.02

Maximum size

Detached (Category Two): 850 sq ft for studio or 1-bedroom, 1,000 sq ft for 2+ bedrooms. Attached: the greater of those caps or 50% of the primary residence floor area, not to exceed 1,200 sq ft. Category One conversions: limited to the existing building envelope plus up to 150 sq ft for ingress and egress. JADU: 500 sq ft max.

Multifamily Category Three ADUs are capped at 850 sq ft (studio or 1-bedroom) or 1,000 sq ft (2+ bedrooms). Minimum size for all types is the California Building Code efficiency unit standard.

Oakland Planning Code 17.103.080(B) Table 17.103.01 (Maximum Size row and notes 3-4) and 17.103.080(C) Table 17.103.02

Owner occupancy

Not required

Owner occupancy is marked N/A for Category One and Two one-family ADUs and 'Not required' for all two- to four-family and multifamily ADUs. Exception: for a JADU the owner must occupy either the JADU or the primary residence (waived when the owner is a government agency, land trust, or nonprofit housing organization).

Oakland Planning Code 17.103.080(B) Table 17.103.01 (Owner Occupancy row, note 8) and 17.103.080(C) Table 17.103.02

Extra parking

One space per ADU (tandem allowed), but waived if the ADU is within a half-mile walking distance of a public transit stop, on a lot in a designated historic area (Area of Primary or Secondary Importance), in a residential-permit-parking area where permits are not offered to ADU occupants, within one block of a carshare vehicle, or created within the existing primary residence or an accessory structure. JADUs never require parking. No replacement parking is required when a covered or uncovered space is removed to build an ADU.

In the S-9 fire zone, the exception allowing a non-interior ADU requires one additional off-street space plus replacement of any lost spaces (17.88.050(B)(1)).

Oakland Planning Code 17.103.080(A)(4) and Tables 17.103.01 and 17.103.02 (Parking for ADUs rows)

Approval process

Permitted use

Ministerial approval: an ADU application complying with 17.103.080 and Chapter 17.88 'shall be granted ministerial approval', unless part of a project separately requiring discretionary review (review times may then be aligned). City describes a two-step process: zoning approval then building permit.

Oakland Planning Code 17.103.080(A)(1)

Rental restrictions

No short-term rental of ADUs: rental only for terms longer than 30 consecutive days. An ADU may not be sold separately from the primary residence except as permitted under state law (Gov. Code 65852.26 provisions). The city's ADU page adds that renting an ADU long-term requires an Oakland business license.

The separate-sale clause contains a typo in the codified text ('Section 65852,26').

Oakland Planning Code 17.103.080(A)(2) and (A)(3)

The fine print: 7 caveats that can change the picture

Oakland classifies ADUs by category: Category One (conversion or rebuild within an existing envelope, plus up to 150 sq ft for ingress/egress), Category Two (new attached or detached construction), Category Three (multifamily only: one new ADU attached to or converted from the primary building, precluding any other ADU on the lot), plus JADUs. A single-family homeowner may combine one Category One, one Category Two, and one JADU for up to 3 units per lot (Table 17.103.01 note 1).
S-9 Fire Safety Protection Combining Zone (Oakland hills wildfire area): Category Two and Three ADUs and outside-envelope conversions are prohibited; lots are limited to one interior-conversion Category One ADU or one JADU, unless one extra off-street parking space is added (plus replacement of lost spaces) or a disability-based reasonable accommodation is approved (17.88.050). ADU height in S-9 is capped at 16 feet and the zoning amnesty program is unavailable there.
Multifamily lots: Category One conversions of non-livable space are allowed at 1 unit or up to 25% of existing units (whichever is greater); detached Category Two ADUs max out at 8 per lot on existing multifamily facilities (and may not outnumber existing units) but only 2 on proposed facilities.
Height and setbacks are category-dependent: one-family Category Two ADUs are capped at 20 feet unless they meet underlying-zone setbacks (never required below 16 feet); multifamily Category Two ADUs at 18 feet plus 2 feet to match the primary roof pitch, dropping to 16 feet if placed in front or beside the primary structure; side and rear setbacks are 4 feet (never less than 3 feet).
Objective design standards apply to ADUs on California Register historic properties: matching roof pitch, exterior materials, and door/window trim when visible from the street, a placement preference order (behind, then beside, then in front of the main building), and a Historic Preservation staff consultation; these do not apply to state-mandated ADUs built under Gov. Code 66323.
Amnesty: owners of unpermitted ADUs established and occupied before January 1, 2021 may request zoning amnesty, and building code enforcement may be delayed up to 5 years (program sunsets January 1, 2035); not available in the S-9 zone (17.103.080(A)(14)).
Parking waivers are broad in practice: any lot in a City of Oakland Area of Primary or Secondary Importance (historic areas covering much of the city), near transit, or near carshare qualifies for zero ADU parking.

Summarized from Oakland's ordinance text, read July 2026; every row links the code section it came from. Rules often vary by zone and lot, so treat this as orientation, not a permit determination, and confirm with the planning department before you commit to a design.

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ADU regulations

California statewide law also applies

California sets baseline ADU rights at the state level. Where local rules are stricter than state law allows, state law usually wins, so both are worth reading.

See California statewide rules

Spotted something outdated?

Zoning codes change. If a link is dead or Oakland has updated its ordinance, report it and we'll verify against the official source.

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