Los Angeles Adu Guide

In Los Angeles, an Accessory Dwelling Unit (Adu) requires a permit if you plan to add a new unit or convert existing space, such as a garage, into a separate living space. The city's Department of Building and Safety (LADBS) oversees the Adu permitting process.

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What Requires a Adu in Los Angeles

According to LADBS, a permit is required for any Adu that involves new construction, a conversion, or an expansion of existing space. This includes converting a garage, basement, attic, or other existing structure into a separate living unit. The permit is necessary regardless of the Adu's size or whether it will be used for rental purposes. Los Angeles has specific zoning and size requirements that must be met, so it's important to review the city's Adu regulations before starting your project.

What Doesn't Require a Permit

In Los Angeles, some minor interior alterations may not require an Adu permit, such as remodeling an existing kitchen or bathroom. Additionally, detached structures under 120 square feet in size are generally exempt from the permit process. However, it's always best to check with LADBS to confirm if your specific project qualifies for an exemption before proceeding without a permit.

Adu Costs and Fees in Los Angeles

The cost of an Adu permit in Los Angeles is based on the project valuation. For a garage conversion, the base permit fee is $750. For new Adu construction, the fees range from $1,200 for projects up to $100,000 in value, up to $2,600 for projects over $200,000. There is also a 12.5% disabled access surcharge added to the building permit fee, as well as a plan check fee equal to 90% of the building permit fee. Inspection fees are charged hourly at a rate of $168 per hour, with a minimum of 1 hour. Additionally, a $44 permit issuance fee and a 0.028% Strong Motion Instrumentation Program (SMIP) surcharge on the total project valuation will apply.

How Long Does Adu Approval Take

The timeline for Adu approval in Los Angeles can vary, but LADBS generally aims to complete the plan check and issue permits within 60 business days for most projects. However, the actual processing time may be longer depending on the complexity of the project and the current workload at the department. LADBS does offer an expedited permitting option for an additional fee, which can reduce the timeline to as little as 10-15 business days.

Required Documents for Los Angeles Adu

To apply for an Adu permit in Los Angeles, you'll need to submit a complete set of plans and documents to LADBS. This includes a site plan, floor plans, elevations, structural calculations, and energy compliance forms. The plans must be professionally drafted and adhere to the city's specific formatting requirements. You'll also need to provide proof of ownership, a completed permit application, and any other supporting documents required by the department.

Step-by-Step Application Process

The Adu permit application process in Los Angeles involves several steps. First, you'll need to prepare your plans and documents according to LADBS requirements. Next, you'll submit the application and plans through the LADBS online portal or in person at the department's office. LADBS will then review the plans and provide any necessary feedback or corrections. Once the plans are approved, you'll pay the permit fees and receive your permit, allowing you to begin construction. During the project, LADBS will conduct required inspections to ensure compliance with building codes and safety standards.

1. 1

   Prepare Plans and Documents

   Gather all necessary plans, drawings, and supporting documents according to LADBS requirements.

2. 2

   Submit Application Online or In-Person

   Apply for your Adu permit through the LADBS online portal or by visiting the department's office.

3. 3

   Plans Review and Approval

   LADBS will review your plans and provide any necessary feedback or corrections. Once approved, you'll be able to pay the permit fees.

4. 4

   Receive Permit and Begin Construction

   After paying the fees, you'll receive your Adu permit, allowing you to start the construction process.

5. 5

   Schedule Required Inspections

   During construction, you'll need to schedule and pass all required LADBS inspections.

Required Inspections

LADBS will conduct several inspections throughout the Adu construction process to ensure compliance with building codes and safety standards. These inspections may include a foundation inspection, framing inspection, electrical inspection, plumbing inspection, and a final inspection before the Adu can be occupied. It's important to schedule these inspections with LADBS and have a qualified inspector on-site during the scheduled times.

Common Adu Permit Mistakes in Los Angeles

One of the most common mistakes homeowners make when applying for an ADU permit in Los Angeles is failing to account for the complex zoning and building code requirements. Many overlook the need to obtain a separate building permit for the ADU, assuming the existing home's permit will suffice. This can lead to delays, additional fees, and even the need to modify the ADU design to comply with the code. Another frequent error is underestimating the permitting timeline, which can take several months in Los Angeles due to the high volume of applications. Homeowners must plan accordingly and factor in the LADBS review and inspection process to avoid costly construction delays.

Sample Adu Permit Cost Calculation

For a typical ADU project in Los Angeles, such as a 800 square foot detached unit with a construction cost of $300,000, the permit fees would be calculated as follows: The base ADU permit fee would be $2,600 (per the LADBS fee schedule), plus a 12.5% disabled access surcharge of $325, and an inspection fee of $168 per hour (assuming 2 hours of inspection time, or $336 total). The plan check fee, which is 90% of the building permit fee, would be $2,340. Additional fees include a $44 permit issuance fee and a SMIP surcharge of $84 (0.028% of the $300,000 project valuation). The total estimated cost for this ADU project in Los Angeles would be approximately $5,729.

How Los Angeles Compares to Other California Cities

Compared to other major California cities, the ADU permit process in Los Angeles can be more complex and costlier. For example, in San Diego, the base ADU permit fee is only $480, significantly lower than the $2,600 base fee in Los Angeles. San Diego also offers a flat $209 inspection fee, rather than the hourly rate used by LADBS. Similarly, the City of San Jose has a simpler, more streamlined ADU permit process with a base fee of $1,500 and a flat $235 inspection charge. In contrast, the Los Angeles permitting timeline can take 6-12 months, longer than the 3-6 month timelines typical in San Francisco or Sacramento. While Los Angeles's robust building code and safety requirements contribute to the higher costs and longer wait times, homeowners may find the process more straightforward in other California municipalities.

Recent Adu Permit Changes in Los Angeles

In 2024, the City of Los Angeles updated its ADU regulations to align with the latest California Building Code (CBC) changes. One significant update was the elimination of the previous 1,200 square foot size limit for detached ADUs, allowing homeowners to build larger units up to 1,600 square feet. Additionally, the LADBS introduced a new online permitting system in 2025, streamlining the application process and reducing in-person visits. This digital transformation has helped reduce the average ADU permit processing time from 9 months to 6 months. Finally, the city recently announced plans to expand its ADU fee waiver program, offering reduced or no-cost permits for income-qualified homeowners, further incentivizing the creation of affordable housing units in Los Angeles.

Tips for Faster Approval in Los Angeles

To help ensure a smooth and timely Adu permit approval process in Los Angeles, it's important to work closely with LADBS and follow their guidelines closely. Submitting a complete and accurate set of plans and documents upfront can significantly reduce the likelihood of delays or rejections. Additionally, it's a good idea to review the city's Adu regulations and requirements in advance to identify any potential issues or areas of concern. Finally, being responsive to any LADBS feedback or requests for additional information can also help expedite the approval process.

Frequently asked questions about Los Angeles adu permits

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