What are Accessory Dwelling Units?

What are ADUs?

The State of California defines an ADU or “accessory dwelling unit” as a self-contained, residential unit located on the same lot as an existing single-family home.

An ADU is smaller in size and must include all of the amenities found in a primary dwelling: a kitchen, bathroom, sleeping area, and storage.

An ADU must also conform to all State and Local City and Planning code requirements, as well as energy and building code requirements established by California Title 24 Building Energy Efficiency Standards and Housing and Community Development CALGreen compliance.

ADUs are also known by many names: granny flats, in-law units, backyard cottages, secondary units, and more.

Types of ADU.

Detached ADU

An independent structure entirely separate from the primary dwelling that includes full amenities.

Garage Conversion

A conversion of an existing garage or structure that includes full amenities.

Attached ADU

An addition, attached to the primary dwelling that includes full amenities.

Interior Conversion

A converted existing, interior space within the primary dwelling, also known as Junior ADUs.