ADU Permit Process & Timeline in Los Angeles (2026)

The ADU permit process, step by step

1. Get permit-ready plans drafted to California and Los Angeles building code.
2. Submit your application to your city or county building department.
3. Completeness check — the city confirms your application is complete within 15 business days.
4. Initial plan check — city review, typically 2–4 weeks.
5. Corrections & resubmittal — address any plan-check comments, usually 1–3 weeks.
6. Agency clearances — LADWP (about 3 months if a power upgrade is needed), Bureau of Engineering, and Fire for hillside lots.
7. Permit issued — pay fees and receive your permit, 1–3 days after approvals.
8. Build & inspections — construction with staged city inspections.

Typical ADU permit timeline in Los Angeles

A simple flat lot with no LADWP upgrade is often permitted in 8–12 weeks; LADWP, Bureau of Engineering, or hillside clearances can push the total to 4–6 months.

What affects your timeline

• LADWP electrical service is usually the biggest variable — about 3 months when a service upgrade is needed.
• Hillside or limited-access lots add Fire Department and grading reviews.
• Correction cycles — incomplete or non-compliant plans trigger extra rounds of review.

How to speed up ADU approval

• Start with a permit-ready plan set drafted to California and LA code — it clears plan-check with fewer corrections.
• Submit a complete application the first time.
• Use a permit-expediting service to manage submittals and corrections for you.

Frequently asked questions

How long does it take to get an ADU permit in Los Angeles?

A straightforward ADU is usually permitted in 8–12 weeks. By law the city must approve or deny a complete application within 60 days, though LADWP or hillside clearances can extend the total to 4–6 months.

Do I need a permit for an ADU in California?

Yes. Every ADU, including a garage conversion, requires a building permit. Plans must be drafted to California and local building code and submitted for plan-check.

What is the 60-day ADU rule?

State law requires a city to approve or deny a complete ADU permit application within 60 days. If the city misses the deadline, the application can be deemed approved.

Can I speed up the ADU permit process?

Yes. Start with a permit-ready plan set, submit a complete application, and consider a permit-expediting service to manage corrections.