ADU Permits in Los Angeles

How to Get an ADU Permit in Los Angeles (2026)

The process to get an ADU permit in LA runs in seven steps. CCS Inc. handles every one of them, but here is exactly what is happening and roughly how long each step takes.

Step 1: Pull a property profile and confirm eligibility

Before drawing a single line, confirm the lot qualifies. Check the zoning (R1, R2, R3, RD, etc.), overlay zones (hillside, fire, flood, coastal, HPOZ), recorded easements, and any active LADBS code-enforcement cases. About 10% of LA lots have a deal-breaker that only shows up at this stage. Our ADU Eligibility Checker runs this profile in 60 seconds.

Step 2: Decide on plans – custom, pre-approved, or modified stock

Three paths exist and they have very different timelines and costs:

• Custom plans – the slowest and most expensive, but the only option for unusual lots or specific design preferences. 8 to 14 weeks of design time.
• AB 1332 pre-approved plans – jurisdiction-stamped stock designs that bypass plan check entirely. 30-day permit timeline in cities that have a pre-approved program (LA City does).
• Modified stock plans – start from a pre-approved set and adjust footprint or layout. Faster than custom, slower than pure stock.

The single fastest way to get an ADU permit is path #2: pre-approved plans. See our ADU Plans service for the full breakdown.

Step 3: Complete the application package

An LA ADU permit application requires the building permit form, plus separate applications for electrical, plumbing, mechanical, and (when grading or demolition is involved) those permits too. You will also need: Title 24 energy compliance documents, Form B-1 if in LA City, a soils report or geotech letter for hillside lots, fire department clearance in VHFHSZ zones, and school-district fee certifications above a square-footage threshold. Missing any one of these triggers an automatic application-incomplete rejection at the counter.

Step 4: Submit and pay fees

LA City has moved most ADU submittals online through LADBS Connect. Other cities still require in-person counter submission or hybrid systems. Building permit fees alone run roughly $4,000 to $12,000 for a typical ADU, with development impact fees, school fees, and utility hookups bringing the total permit-fee bill to $8,000 to $25,000+ in most cities. See the full ADU permit cost breakdown by city.

Step 5: Plan check (the time-suck)

Plan check is the slowest step. Citywide turnaround in LADBS has averaged 4 to 8 weeks for first-round review, then 2 to 4 weeks per correction cycle. The number of correction cycles is what determines whether you get permitted in 2 months or 8 months. A clean first-round submission can clear with one correction or none; a sloppy package can take three or four cycles.

Step 6: Permit issuance

Once plan check signs off and fees clear, the permit is issued. You can now legally start construction. CCS coordinates the foundation pour the same week the permit is in hand.

Step 7: Inspections through Certificate of Occupancy

Expect roughly 8 to 14 inspection visits across the build: foundation forms, foundation pour, framing, MEP rough-ins, insulation, drywall, and final. Once final passes, the city issues a Certificate of Occupancy and the ADU is legally inhabitable.

What Is the Fastest Way to Get an ADU Permit?

From fastest to slowest:

1. AB 1332 pre-approved plans + complete submittal – as fast as 30 days to permit in LADBS.
2. Custom plans with high first-round quality + 48-hour correction turnaround – typically 8 to 14 weeks.
3. Custom plans with average drafting + slow corrections – 4 to 8 months.
4. DIY or low-budget drafter with multiple correction rounds – 9 to 18 months.

The reason path #1 is so fast is structural: pre-approved plans skip the plan check queue entirely. The reason path #2 beats path #3 by months is that LADBS reviewers have checklists, and drafters who know those checklists produce clean first-round submissions. CCS drafts to those checklists. See our ADU drafting service.

What ADU Permits Cost in LA

“ADU permit cost” usually means one of three different bills – know which one is being quoted to you:

• Permit fees paid to the city – $8,000 to $25,000 for a typical LA ADU.
• Permit expediting service fee – what CCS or another expediter charges to manage the permit process for you. Usually $4,000 to $9,000 depending on jurisdiction and plan complexity.
• Plan preparation cost – the drafting and engineering fee to produce the plans being permitted. $6,000 to $25,000 depending on path (stock vs custom) and ADU size.

For a full apples-to-apples comparison by city, see our ADU Permit Cost Los Angeles guide.

Get a Free ADU Permit Consultation

Tell us your address and what you want to build. We will tell you the eligibility, the fastest permit path for your lot, the realistic timeline, the all-in cost, and the next concrete step. No obligation, no pressure. Call (323) 405-8909 or schedule a free consultation.