Planning an ADU in Los Angeles County? Here are some Resources

Two agencies must approve your plans; Regional Planning determines if your plans conform to zoning requirements – height, setback, etc. The Department of Building & Safety will make sure that your little unit conforms to all building codes for a dwelling

Accessory Dwelling Unit Handbook

Start with this online booklet by the California Department of Housing and Human Development.Well written overview of ADU issues.

ADU Handbook PDF


Step-by-Step Guide for Accessory Dwelling Units in Los Angeles Unincorporated Areas

Covers the steps required by County zoning and permitting.

ADU Step-by-Step PDF


Ordinance 2020-0059 – Title 22

Amendment to Los Angeles County code establishing development standards for ADUs.

Ordinance PDF

Public Works Los Angeles
County Building & Safety

Homeowner’s Guide. How to Successfully Plan and Prepare for your next Accessory Dwelling Unit (ADU)/ Junior Accessory Dwelling Unit (JADU) Project

Covers all steps and requirements for building permits and construction once zoning has been approved.


LA County Planning

Planning Permits for Accessory Dwelling Units

Basic ADU information with links to other pages. Links to a Standard ADU Plans Program with pre-approved construction plans that streamline Building and Safety approval.“Coming soon” they tell us.


LADPW Accessory Dwelling Unit –Expedited Plancheck Submittal Checklist

Building & Safety checklist of most everything that needs to be specified or shown on plans for ADUs

ADU Checklist PDF


California Housing Finance Agency (CalHFA) Grant Program

ADU Grants up to $40,000 towards pre-development and non-reoccurring closing costs. Predevelopment costs include site prep, architectural designs, permits, soil tests, impact fees, property survey, and energy reports.


Neighborhood Housing Services of Los Angeles County (NHS)Assists low income households access favorable financing.