A guide for ADU construction in Los Angeles, California

Build a custom accessory dwelling unit (ADU) on your Los Angeles property. Get expert local guidance, transparent pricing, and fast approvals for your granny flat, in-law suite, or rental unit.

Why Build an ADU in Los Angeles, California?

Los Angeles homeowners are discovering the incredible benefits of adding accessory dwelling units to their properties. With the city's progressive ADU ordinances and streamlined approval process, now is the perfect time to expand your living space and generate rental income. LA leads the nation with over 25,000 ADU permits issued in the last five years, demonstrating the city's commitment to making ADU development accessible and profitable for property owners.

If you're not familiar with what an Accessory Dwelling Unit (ADU) is, it is a secondary housing unit on the same property as a primary residence, often used for rentals, guest accommodations, or extra family living space. Commonly called granny flats, backyard cottages, or in-law suites, ADUs offer homeowners flexible housing options, additional income potential, and increased property value. As cities like Los Angeles continue to seek solutions for housing shortages, ADUs have become a practical and popular choice.

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Los Angeles ADU Market Insights

Los Angeles processes more ADU permits than any other US city, with 5,188 permits issued in 2021 alone. The extensive Metro rail system provides transit-oriented development bonuses throughout the city. Average construction timeline is just 4-6 months from permit to completion. Over 70% of LA properties qualify for parking requirement waivers due to transit proximity.

  • 30-35% average property value increase for Los Angeles homes with ADUs
  • $1,300-$3,700 monthly rental income potential in Los Angeles's strong rental market
  • $200-$350 per sq ft average construction costs in Los Angeles

Complete Guide to Los Angeles ADU Regulations
(2025 Updated)

Los Angeles offers some of the most flexible ADU regulations in California, making it easier than ever to add value to your property. The city has eliminated owner-occupancy requirements and streamlined the approval process to just 60 days.

What You Can Build on Your Los Angeles Property

Los Angeles's ADU ordinance allows remarkable flexibility for homeowners:

Maximum ADU sizes in Los Angeles

1,200 sq ft for detached ADUs

50% of primary dwelling for attached ADUs

800 sq ft minimum allowed regardless of lot size

Setbacks for Los Angeles ADUs

4 feet from side and rear property lines

No setback required for garage conversions

Front setback cannot prevent 800 sq ft ADU

Height Restrictions in Los Angeles

16 feet standard

18 feet within 0.5 miles of Metro stations

25 feet for attached ADUs

Parking Requirements in Los Angeles

No parking required within 0.5 miles of Metro stations or bus stops with 15-minute headways

No replacement parking for garage conversions,

Street parking permits available for ADU occupants

Best Neighborhoods for ADUs in Los Angeles

Los Angeles neighborhoods offer diverse opportunities for ADU development, from transit-rich areas to spacious suburban lots. Each area has unique characteristics that affect rental demand and property values.

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Frequently Asked Questions on ADU Guidelines in Los Angeles

Feasibility

Can I build an ADU on my property in Los Angeles?

Yes, if your property is zoned for residential use and has an existing or proposed single-family or multifamily dwelling, you may be eligible to build an ADU. Specific requirements apply, so it's essential to consult with the Los Angeles Department of Building and Safety (LADBS) to determine your property's eligibility.

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

The permitting process can vary based on the complexity of your project. For standard plans, approvals may be quicker, while custom designs might take longer. It's advisable to consult with LADBS or a professional familiar with local regulations for accurate timelines.

How many ADUs can I have in Los Angeles?

For single-family properties, you can have one ADU and one Junior ADU (JADU). Multifamily properties may be allowed multiple ADUs, subject to specific regulations and limitations.

Permitting

Is there a minimum lot size for an ADU in Los Angeles?

No, there is no minimum lot size requirement to build an ADU in Los Angeles. However, other zoning and building standards must be met.

Design

Do I need a permit for an ADU in Los Angeles?

Yes, obtaining a building permit is mandatory for constructing an ADU in Los Angeles. The permit ensures that the ADU complies with local building codes and zoning regulations.

Is there a minimum and maximum size for an ADU in Los Angeles?

Yes. The minimum size for an ADU is 150 square feet. The maximum size varies: for detached ADUs, up to 1,200 square feet; for attached ADUs, up to 50% of the existing primary dwelling's floor area, not exceeding 1,200 square feet.

Can you build a 2-story ADU in Los Angeles?

Yes, two-story ADUs are permitted, provided they comply with height restrictions, setback requirements, and other zoning regulations. It's essential to consult with LADBS for specific guidelines related to your property.

How many bedrooms can an ADU have in Los Angeles?

There is no specific limit on the number of bedrooms in an ADU. However, the total size of the ADU must comply with the maximum square footage allowed.

Utilities

How close to the property line can I build an ADU in Los Angeles?

ADUs must generally maintain a minimum setback of 4 feet from the side and rear property lines. Front yard setbacks vary based on zoning and other factors.

Does an ADU need its own electrical panel, water meter, or gas meter in Los Angeles?

An ADU can share utilities with the primary residence or have separate connections. Separate meters are optional and may be installed based on the homeowner's preference and utility company requirements.

Are fire sprinklers required in an ADU in Los Angeles?

Fire sprinklers are not required in an ADU if they are not required in the primary residence. However, if the primary dwelling has fire sprinklers, the ADU must also have them.

Is solar required on an ADU in Los Angeles?

Yes, new construction ADUs are subject to California's Building Energy Efficiency Standards, which may require solar panels, especially for detached units. Compliance depends on the specific characteristics of the ADU.

Financials

How much can I rent an ADU for in Los Angeles?

Rental rates for ADUs vary based on location, size, and amenities. In Los Angeles, ADUs can command monthly rents ranging from $1,500 to $3,000 or more, depending on the neighborhood and unit features.

Can an ADU be used as an Airbnb or short-term rental in Los Angeles?

Short-term rentals (less than 30 days) of ADUs are generally prohibited in Los Angeles unless specific conditions are met. It's crucial to consult local ordinances and regulations before listing an ADU as a short-term rental.

Can your HOA prevent your ADU build in Los Angeles?

Homeowners Associations (HOAs) cannot unreasonably restrict the construction of ADUs. However, they may impose reasonable standards related to design and aesthetics.

How does an ADU affect property taxes in Los Angeles?

Adding an ADU will increase your property's assessed value, leading to higher property taxes. The increase is based on the value of the new construction, not the entire property.

How much value does an ADU add in Los Angeles?

An ADU can significantly increase your property's value, often by 20-30%, depending on the quality of construction and local market conditions. Additionally, rental income from the ADU can enhance the property's appeal to potential buyers.

How much does it cost to build an ADU in Los Angeles?

The cost to build an ADU in Los Angeles varies widely based on size, design, and materials. On average, construction costs range from $100,000 to $300,000 or more. Garage conversions tend to be less expensive than new constructions.