City · California

ADU rules in Santa Ana

4 sources

These are the primary sources for accessory dwelling unit regulations in Santa Ana: 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

ADUs (attached or detached) may be permitted in all zoning districts where residential or mixed-use development is permitted. Detached ADUs capped at 2 stories / 20 ft; multifamily lots may add up to 8 detached ADUs (not exceeding the number of existing units).

SAMC Sec. 41-194.2(A), (E); Table 41-194.3

Attached or internal ADU

Allowed

Attached ADUs allowed in all residential and mixed-use zones; size tied to 50% of the primary residence's habitable space (may exceed that ratio to reach 800 sq ft, never above 1,000 sq ft).

SAMC Sec. 41-194.2(A); Table 41-194.3 note (A)

Maximum size

1,000 sq ft (attached or detached); attached ADUs also limited to 50% of the primary residence's habitable space, though that ratio may be exceeded to allow up to 800 sq ft; 800 sq ft cap when an ADU and a JADU are both on the lot; JADUs max 500 sq ft; conversions of existing accessory structures or primary-residence space have no size limit (plus up to 150 sq ft expansion). Minimum size 220 sq ft.

Detached ADU height cap 20 ft / 2 stories; setbacks 4 ft side and rear.

SAMC Table 41-194.3 and notes (A) through (D)

Owner occupancy

Not required

No owner-occupancy requirement for ADUs anywhere in Sec. 41-194 (consistent with the statewide ban), and the city's standards page states 'No owner occupancy requirements' for ADUs. JADUs are different: a recorded covenant must require the owner to occupy either the primary dwelling or the JADU.

SAMC Sec. 41-194.5 (JADU covenant); city ADU/JADU Development Standards page (ADU statement)

Extra parking

1 space per ADU (tandem permitted; none for JADUs), waived if any state exemption applies: within 1/2 mile walking distance of public transit, in a historic district, conversion of existing primary residence or accessory structure, on-street permits not offered to ADU occupants, car share within one block, studio ADU with no bedrooms, or ADU proposed with a new single-family or multifamily residence that meets any other criterion. No replacement parking required when a garage, carport, or covered or uncovered space is demolished or converted for the ADU.

The exemption list is broad; most conversions and transit-adjacent ADUs owe zero parking.

SAMC Table 41-194.3 and notes (L), (M)

Approval process

Permitted use

Ministerial review: the executive director of the planning and building agency approves or denies ADU/JADU permits based solely on completeness and conformance with the code; disapprovals are appealable via a minor exception application.

SAMC Sec. 41-194.2(B); Sec. 41-194.6

Rental restrictions

No short-term vacation rentals; ADUs and JADUs may only be rented for periods of 30 days or more. ADUs may not be sold separately from the primary residence except via a qualified nonprofit under Gov. Code 65852.26 with an affordable housing agreement; JADUs may never be sold separately.

The 30-day minimum appears on the city's official ADU/JADU Development Standards page ('ADUs may not be used as a short-term vacation rental, but can be rented for periods of 30 days or more'); it is not stated within Sec. 41-194 itself. Separate-sale limits are in the code.

City ADU/JADU Development Standards page; SAMC Sec. 41-194.2(H), Sec. 41-194.5(1)

The fine print: 7 caveats that can change the picture

Unit counts vary by lot type: single-family lots get max one ADU plus one JADU; existing multifamily lots may convert non-livable space to ADUs (min 1, max 25% of unit count) plus build up to eight detached ADUs not exceeding the number of existing units (SB 1211 conformance via Ord. NS-3076); proposed multifamily buildings get up to two detached ADUs; lots with multiple detached single-family residences get one ADU and no JADU (Sec. 41-194.2(C) through (G)).
Attached ADU size is tied to 50% of the primary residence's habitable space, with an 800 sq ft floor and a 1,000 sq ft absolute cap; lots with both an ADU and a JADU cap the ADU at 800 sq ft (Table 41-194.3 notes (A), (B)).
Conversions of existing accessory structures or primary-residence space are exempt from size, height, setback, lot coverage, open space, and separation standards, and may expand up to 150 sq ft (Table 41-194.3 notes (C) through (K)).
Several standards (front setback, lot coverage, open space, building separation) must yield to allow an ADU of up to 800 sq ft (Table 41-194.3 notes (F), (H), (I), (K)).
ADUs and JADUs on historic properties must conform to the Secretary of the Interior's Standards for the Treatment of Historic Properties (Sec. 41-194.4).
The 30-day minimum rental term is published on the city's ADU standards page but is not written into Sec. 41-194; confirm against any citywide short-term rental ordinance before relying on it.
The city permanently migrated from santa-ana.org to santa-ana.gov in July 2026; old .org ADU URLs may redirect or die.

Summarized from Santa Ana'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 Santa Ana has updated its ordinance, report it and we'll verify against the official source.

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