Question 1

What is an Accessory Dwelling Unit (ADU)?

Accepted Answer

An accessory dwelling unit, commonly called an ADU, is an independent residential unit located on the same property as a primary home. An ADU normally includes its own living area, kitchen, bathroom, sleeping space and entrance.

Question 2

What types of ADUs are available?

Accepted Answer

ADUs may be detached from the main house, attached to it, created through an addition, or converted from existing space such as a garage, basement or accessory building. A Junior ADU, or JADU, is a smaller unit created within a single-family residence and is subject to different requirements.

Question 3

Can I build an ADU on my property?

Accepted Answer

Many California properties with an existing or proposed residence can accommodate an ADU. ADUs are generally permitted in residential and mixed-use zones where residential use is allowed, but the final design must satisfy applicable building, fire, utility and objective local development standards.

Question 4

Is there a minimum lot size for an ADU?

Accepted Answer

California jurisdictions may not establish a minimum lot-size requirement for an ADU. The lot must still have enough usable space to satisfy applicable setbacks, building separation, fire access, utility and construction requirements.

Question 5

Where can an ADU be placed on my property?

Accepted Answer

An ADU may be located behind, beside or, in some cases, in front of the primary residence. The best location depends on property lines, easements, setbacks, utilities, fire access, topography and the location of existing structures.

Question 6

Does the property need to be flat?

Accepted Answer

No. ADUs can often be designed for sloped or irregular properties. A sloped site may require additional engineering, grading, retaining walls, drainage improvements or a specialized foundation.

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ADU Frequently Asked Questions

Frequently asked questions