Can I Build an ADU in Long Beach?

Yes — by right

ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.

1 ADU + 1 JADU

At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).

Conversion ADUs (≥1, up to 25% of units) + up to 8 detached

Conversions of non-livable space (at least 1, or up to 25% of existing units) plus up to 8 detached ADUs on a lot with existing multifamily — never exceeding the number of existing units. JADUs are single-family only.

Allowed

Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).

1,200 sq ft

Statewide default cap for detached new-construction ADUs in the absence of a compliant local ADU ordinance. The unconditional by-right floor a city must always allow is 800 sq ft (see Guaranteed minimum size); a city with a compliant ordinance may set its own ceiling.

50% of the primary dwelling's gross floor area, or 800 sq ft, whichever is greater

Long Beach's recited rule guarantees at least 800 sq ft, but state law still guarantees at least 850 sq ft (1,000 sq ft for 2+ bedrooms) for an attached ADU, which controls.

800 sq ft

An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).

500 sq ft

16 ft

16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.

4 ft

Long Beach's 2019 code recites a 5-ft side/rear setback for detached ADUs, but the 4-ft state maximum controls for a qualifying new-construction ADU.

4 ft

Same as the side setback — the recited 5-ft local rule yields to the 4-ft state maximum for the by-right ADU.

No front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone

None required

No statewide separation requirement between the ADU and the primary dwelling.

Up to 1 space

At most 1 space per ADU (or per bedroom, whichever is less) — and waived in the common cases below.

Yes — no parking required near transit & for conversions

No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.

Not required

When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.

Ministerial (by right)

No public hearing or discretionary design review for a qualifying ADU.

60 days

LBMC still recites a 120-day timeline, but the 60-day state deadline controls and deems the application approved if missed.

Only for a JADU

LBMC § 21.51.276.E.1.a still requires the owner to occupy the primary dwelling or ADU (unless both are rented to the same tenant), but state law bars owner-occupancy for ADUs; it survives for JADUs only.

Waived under 750 sq ft

An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.

Building permit, Recorded deed restriction

Ministerial review, but Long Beach's ordinance requires a deed restriction be recorded; confirm this survives current state preemption with Long Beach Planning.