Los Angeles ADU Permitting Guide
Your quick reference to Los Angeles Building & Safety Division services for accessory dwelling units, with clear steps and local code details.
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Local Authority
The Los Angeles Building & Safety Division serves as the Authority Having Jurisdiction for all accessory dwelling unit projects in the city. Under the 2021 International Residential Code, as adopted by the City of Los Angeles, ADU owners must comply with zoning setbacks, parking exemptions, and fire‑rated wall requirements outlined in the Los Angeles Municipal Code. The Division reviews plans for structural integrity, energy efficiency, and accessibility, ensuring each unit meets the city’s safety standards before construction can begin.
What Your ADU Permit Needs
To obtain an ADU permit in Los Angeles, you must submit a complete set of construction drawings, a site plan showing the unit’s footprint, and a compliance checklist for the 2021 International Residential Code. The package also requires proof of ownership, a recent property survey, and any required utility connection agreements. All documents should be signed by a licensed architect or contractor and include a signed declaration of compliance with local fire and seismic regulations.
The Division also expects a completed fee schedule, a copy of the homeowner’s insurance certificate, and, when applicable, a neighborhood council clearance. If the project involves a detached ADU, additional setbacks and driveway access details must be provided. Once the submission is complete, the plan‑check team will conduct a first‑review within the standard turnaround time.
Common Project Types
Attached ADU
Adds living space to an existing home while sharing a wall, ideal for multigenerational families.
Detached ADU
A separate structure on the same lot, offering privacy and rental potential.
Garage Conversion
Transforms an existing garage into a compliant accessory dwelling unit.
Junior ADU
A smaller unit up to 500 square feet, perfect for a home office or guest suite.
Building Department
- Authority
- Los Angeles Building & Safety Division
- Address
- 201 N. Main St., Los Angeles
- Permit Portal
- Los Angeles Permit Center
- Fees
- Fees are based on project size and scope and are calculated at the time of application.
Frequently Asked Questions
How long does the first review of an ADU permit take?
The Division typically completes the first plan‑check review within ten business days for complete submissions. Incomplete packages may extend the timeline.
Can I submit my ADU plans online?
Yes, the Los Angeles Permit Center portal accepts electronic plan sets, supporting PDF uploads and digital signatures. Online submissions often receive faster acknowledgment.
What local amendments affect ADU construction?
Los Angeles has specific setbacks, height limits, and parking exemptions detailed in the municipal code. These amendments are published on the Building & Safety website and must be referenced during plan preparation.
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