What is an Accessory Dwelling Unit?

An Accessory Dwelling Unit (ADU), also known as a Granny Flat, or Companion Unit is a second rentable unit that a homeowner can build on a residential lot.

Faced with a major affordable housing crisis, the California legislature reset the regulations for ADUs providing more homeowners than ever the opportunity to build a second unit on single family lots.

Learn more about The 2020 State ADU requirements.

What Does the ADU Coalition Do?

For Homeowners:

 Provide accurate up to date information on:

For Industry:    

Provide access to:

For Policy Makers:

  • Provide Assistance in Developing Successful Policies

  • Research on How Policy Decisions Impact Development 

  • Comparative Guide to Policies in Other Jurisdictions 

  • Understanding of Opportunities and Limitations of ADUs


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ADU Coalition © 2020  

A committee of the San Diego
American Institute of Architects

a non-profit 501(C) organization

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