ADUs in Los Angeles: rules, requirements and what fits on your property
What state law allows on any property in Los Angeles, what the city adds, and what it costs to build. Updated November 6, 2026.
The typical home in Los Angeles is worth about $927,891 and rents for about $2,772 a month (Zillow, September 2026). An ADU adds a second home to that property under the rules below.
Full report: zone, what fits, where it goes, fees and the plans that fit.
What state law allows in Los Angeles
These apply in every California city and county. The city can allow more, never less. State rules current to November 6, 2026.
- Detached ADU
Up to 1,200 sq ft. At least 800 sq ft is always allowed.
- Height
16 ft; 18 ft within half a mile of transit, plus 2 ft for a roof that matches the home.
- Setbacks
4 ft from the side and back of the property.
- Parking
None needed within half a mile of transit, or for a conversion.
- Fees
No impact fees up to 750 sq ft. No school fees up to 500 sq ft.
- Timeline
The city must decide within 60 days of a complete application.
What Los Angeles adds
From the city's ordinance, as applied in every report.
- Rules
- Every rule, with its source and status: ADU rules in Los Angeles.
- Plans
- The LADBS standard plans: pre-approved ADU plans.
- ADU handbook
- LADBS Accessory Dwelling Unit page, with Information Bulletin IB-P-BC-2026-150Read November 6, 2026.
- Pre-approved plans
- LADBS Approved Standard Plans ProgramRead November 6, 2026.
- Homeowner associations
- HOAs can set reasonable rules but can’t ban ADUs (Civil Code 4751).
Los Angeles in numbers
Figures from public sources, each with where it was read and when.
- Typical home value
- $927,891Zillow Home Value Index, mid-tier, September 2026. Read November 7, 2026.
- Typical rent
- $2,772 a monthZillow Observed Rent Index, all homes, September 2026. Read November 7, 2026.
Questions about ADUs in Los Angeles
Short answers from the state rules and the city's own figures. Your address gives the answer for your property.
- Can I build an ADU in Los Angeles?
- Yes. State law requires every California city and county, including Los Angeles, to allow at least one ADU on a property with a home, and a junior ADU inside the home. Most properties zoned for homes qualify. Los Angeles can add its own limits but cannot go below the state minimums. Enter your address to see the rules for your property.
- How big can an ADU be in Los Angeles?
- State law allows a detached ADU of up to 1,200 sq ft, and at least 800 sq ft is always allowed regardless of lot coverage. A junior ADU inside the home can be up to 500 sq ft. An attached ADU can be half the size of the home, and 800 sq ft is always allowed.
- What are the setback and height rules for an ADU in Los Angeles?
- At least 4 ft from the side and back of the property. Height is 16 ft, or 18 ft within half a mile of major transit, plus 2 ft for a roof that matches the home. Los Angeles can allow more.
- Do I need parking for an ADU in Los Angeles?
- No parking is required within half a mile of major transit, for a garage conversion, or when parking is available on the street. When a garage is converted, no replacement parking is required.
- How much does an ADU cost in Los Angeles?
- Build cost depends on size and the site. ADUCheck's range is $250 to $400 per sq ft for new construction and $100 to $200 per sq ft for a conversion, from the Terner Center ADU owner survey. The typical home in Los Angeles is worth about $927,891 (Zillow, September 2026). City impact fees are waived up to 750 sq ft and school fees up to 500 sq ft.
- What does an ADU rent for in Los Angeles?
- The typical home in Los Angeles rents for about $2,772 a month (Zillow Observed Rent Index, September 2026). A new one- or two-bedroom ADU usually rents for less than a full home in the same ZIP.
- Does Los Angeles have pre-approved ADU plans?
- Yes. LADBS Approved Standard Plans Program (read from the city's own page on November 6, 2026).
- How long does an ADU permit take in Los Angeles?
- State law gives the city 15 business days to say whether your application is complete and 60 days from a complete application to approve or deny it. A missed deadline counts as approval.