Los Angeles County Department of Regional Planning

Accessory Dwelling Units

Accessory Dwelling Units

Need more living space for your family?

Need more living space for your family? Want to earn rental income? You can build an accessory dwelling unit on the residential or agriculturally zoned property that you own.

What is an ADU?

An ADU is a dwelling unit with a full kitchen and bathroom, which is an accessory use to a primary or main single family residence. The ADU can be used as a rental, but cannot be sold separately from the primary or main single family residence. The existing residence must be a legally established structure.

How to apply for an ADU

An Accessory Dwelling Unit shall be permitted with a site plan review if:

  • The zoning of the property is R-A, R-1, R-2, R-3, R-4, A-1 or A-2 (or any other zone that allows single-family residences by right; look up your zoning);
  • One single family residence (legal) exists on site; and
  • The ADU complies with the development standards of the provided summary.

In addition to submitting a site plan application to the Department of Regional Planning, you will need to submit the following additional documentation:

  • Copies of Building Description Blank/Slip from L.A. County Assessor’s office
  • Copies of building permits from L.A. County Building & Safety office

Development standards

ADUs are subject to certain standards for unit size, height, yard setbacks and parking. Click summary for general development standards for ADUs.

Pilot Program

For more information about the County’s Second/Accessory Dwelling Unit Pilot Program, please visit our pilot program page. Please note that the application period for the pilot program has closed. If you already have a unit available for rent and would like to learn about County incentives to landlords for housing veterans and people experiencing homelessness, please visit the Community Development Commission/Housing Authority’s web site.

Banner Photos from AccessoryDwellings.org

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Department of Regional Planning
320 West Temple Street
Los Angeles, CA 90012
T: (213) 974-6411 . F: (213) 626-0434
TDD: (213) 617-2292
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