ADU Rules in Long Beach.
Local ADU regulations, permit fees, setback requirements, and typical timelines for Long Beach. Last updated 2026-05-27.
Long Beach ADU Requirements
Attached ADU: up to 25 ft
Long Beach has extensive bus and Metro Blue/Green/A Line access.
Design 4 weeks · Permit 6 weeks · Build 36 weeks
Plain-language summary
In Long Beach, a detached ADU requires a minimum 4-foot side setback and 4-foot rear setback. The maximum height for a detached ADU is 16 feet, while an attached ADU may be up to 25 feet. The maximum size for a detached ADU is 1,200 sq ft; a Junior ADU (JADU) is limited to 500 sq ft. Replacement parking is not required for most projects. Typical permit fees range from $7,000 to $15,000. A typical project takes approximately ~11 months from design start to move-in, including 4 weeks of design, 6 weeks for permit review, and 36 weeks of construction.
⚠️ ADU rules change frequently. Always verify current requirements with the Long Beach Building & Safety Department before submitting plans. Official source →
What to Watch Out For
- Coastal Zone applies to properties near the waterfront (Belmont Shore, Naples, Bluff Park areas) — Coastal Development Permit required.
- Long Beach is generally an ADU-friendly jurisdiction with a streamlined review process.
- Some R-1 zones in Long Beach allow two detached ADUs per lot under state law.
How Long Does It Take to Get an ADU Permit in Long Beach?
Site study, floor plans, elevations, structural drawings.
Plan check, corrections, and permit issuance by Long Beach Building & Safety.
Foundation, framing, MEP rough-in, finishes, final inspection.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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