Los Angeles County · Updated April 2026
LA ADU Permits: Fees, Timeline & Pre-Approved Plans
2025 rules require 60-day approval. Pre-approved plans get you there in 30 days. Here's everything you need to know.
Quick Answer
Los Angeles ADUs: $150K–$400K
Permits: $5K–$15K · Updated April 2026
Los Angeles ADU Permits: 2025 Rules Overview
Los Angeles ADU permitting has been dramatically simplified by 2025 California law. The city is now required to issue ADU permit decisions within 60 days of a complete application — a major improvement from the 8–16 week reviews that were common before. ADUs go through a ministerial review process, meaning there are no public hearings, no neighborhood input periods, and no discretionary conditions. If your plans meet code, you get your permit.
The city's Standard Plan Program offers pre-approved ADU designs that cut plan check time to just 2–3 weeks. The LA ADU Accelerator program provides up to $10,000 in grants for homeowners using pre-approved plans. Permit fees run $5,000–$15,000, with design and engineering adding $10,000–$25,000 for custom projects (or as little as $5,000–$10,000 with pre-approved plans).
Key 2025 change: State law now mandates 60-day approval for ADU permits citywide. Failure to meet this deadline means the application is deemed approved. This has significantly reduced permitting delays across Los Angeles.
LA ADU Permit Fee Breakdown
| Cost Category | Pre-Approved Plans | Custom Plans |
|---|---|---|
| LADBS Permit Fees | $5,000–$15,000 | $5,000–$15,000 |
| Design / Engineering | $5,000–$10,000 | $10,000–$25,000 |
| LA ADU Accelerator Grant | Up to –$10,000 | Not applicable |
| Estimated Soft Cost Total | $0–$15,000 (after grant) | $15,000–$40,000 |
Soft costs above are separate from construction costs. Total ADU build costs in Los Angeles run $150,000–$400,000 depending on type and size.
Pre-Approved vs. Custom Plans: Full Comparison
| Stage | Pre-Approved Plans | Custom Plans |
|---|---|---|
| Design Time | 1–2 weeks | 4–6 weeks |
| Plan Check | 2–3 weeks | 4–6 weeks |
| Total Permit Timeline | 30–60 days | 60 days (legally required max) |
| Design / Soft Cost | $5,000–$10,000 | $15,000–$30,000 |
| Grant Eligibility | Yes (up to $10K) | No |
| Design Flexibility | Limited to available designs | Fully custom |
LA ADU Timeline: Before 2025 vs. Now
Before 2025
- ✕ Plan check: 8–16 weeks
- ✕ No guaranteed approval window
- ✕ Multiple correction cycles common
- ✕ Total timeline: 12–18+ months
Now (2025+)
- Pre-approved: 30–60 day approval
- Custom: 60-day approval required by law
- Ministerial review — no hearings
- Deemed approved if deadline missed
Estimate Your LA ADU Cost
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Get Your EstimateLA ADU Permit Process: Step by Step
Site Assessment
Verify your lot's zoning, setbacks, and utilities. Confirm whether the property is in a special overlay zone (hillside, flood, fire) that may add review steps.
Design / Plan Selection
Choose a pre-approved plan from LADBS's Standard Plan Program, or hire an architect for a custom design. Pre-approved plans save 1–4 weeks and $5,000–$20,000.
Submit via LADBS PermitLA
Submit your complete application through the LADBS PermitLA online portal. Include site plan, floor plans, elevations, structural calculations, and Title 24 energy compliance documents.
Plan Check (2–3 weeks for pre-approved)
LADBS reviews plans for code compliance. Pre-approved plan check takes 2–3 weeks. Custom plan check takes 4–6 weeks. Corrections must be addressed and resubmitted.
Permit Issuance
Pay permit fees ($5,000–$15,000) and receive your building permit. The 60-day approval clock starts at initial submission — not resubmission after corrections.
Construction
Build your ADU with licensed contractors. Required inspections include foundation, framing, MEP rough-in, insulation, and drywall. Schedule inspections through the LADBS portal.
Final Inspection & Certificate of Occupancy
LADBS conducts a final inspection. Upon passing, a Certificate of Occupancy is issued and your ADU is legally habitable. You can begin renting immediately.
LA ADU Cost by Type
| ADU Type | Total Build Cost | Construction Time |
|---|---|---|
| Garage Conversion | $120,000–$160,000 | 3–6 months |
| Detached 1-Bedroom | $180,000–$250,000 | 6–9 months |
| Custom 2-Bedroom | $250,000–$350,000 | 9–12 months |
| Prefab / Modular | $130,000–$200,000 | 4–6 months |
Build costs are separate from permit fees and design costs. Total project budgets should add $15,000–$40,000 for soft costs on top of construction. Updated April 2026.
Key 2025 LA ADU Rules
60-Day Approval
All ADU permits must be decided within 60 days — deemed approved if missed.
Parking Waiver
Parking generally waived near transit stops. No replacement parking required for garage conversions.
15-Year Rent Control Exemption
New ADUs are exempt from LA's rent stabilization ordinance for 15 years from Certificate of Occupancy.
Multiple ADUs Per Lot
One ADU + one JADU allowed per single-family lot. Multi-family lots may qualify for more units under state law.
LA ADU Accelerator Grant
Up to $10,000 in grants available for homeowners using pre-approved ADU plans through the city's program.
Ministerial Review
No public hearings, no neighbor input period, no discretionary conditions. Code compliance = permit approval.
LADBS Permitting Requirements
- Portal: All submissions through the LADBS PermitLA online portal (no in-person filing required).
- No public hearings: ADUs are ministerially approved — neighbors cannot block your permit.
- Ministerial review: LADBS checks plans against objective standards only — design, aesthetics, and neighborhood character are not grounds for denial.
- Required documents: Site plan, floor plans, elevations, structural calculations, Title 24 energy compliance, soils report (hillside properties).
- 60-day clock: Starts at submission of complete application. Incomplete applications trigger a correction notice that pauses the clock.
Frequently Asked Questions
How long does it take to get an ADU permit in Los Angeles?
Under 2025 California law, LA must issue an ADU permit decision within 60 days of a complete application. Using pre-approved plans from LADBS's Standard Plan Program reduces this to 30–60 days. Before 2025, plan check alone took 8–16 weeks — a major improvement for homeowners.
How much do ADU permits cost in Los Angeles?
LADBS permit fees range from $5,000 to $15,000 depending on project size and valuation. Design and engineering add $10,000–$25,000 for custom plans, or $5,000–$10,000 using pre-approved plans. The LA ADU Accelerator program offers up to $10,000 in grants to offset costs for homeowners using pre-approved designs.
Does LA offer pre-approved ADU plans?
Yes. LADBS operates a Standard Plan Program with architect-designed, pre-reviewed ADU plans. Using one reduces plan check time from 4–6 weeks to 2–3 weeks and saves $5,000–$20,000 in design costs. The city's ADU Accelerator program also provides up to $10,000 in grants exclusively for homeowners using these pre-approved designs.
Is parking required for an ADU in Los Angeles?
Generally no. Parking is waived for ADUs located within half a mile of a transit stop, which covers most of Los Angeles. When a garage is converted to an ADU, replacement parking is not required under state law. LADBS follows state guidance that limits parking requirements for ADUs citywide.
Can I build multiple ADUs on my lot in Los Angeles?
Yes. A standard single-family lot in Los Angeles can have one detached or attached ADU plus one Junior ADU (JADU, up to 500 sq ft within the main home). Properties with multi-family structures may qualify for additional ADUs under state law. All units go through the same ministerial LADBS review process.
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