An ADU, or Accessory Dwelling Unit, is a secondary housing unit on a single-family residential lot. It can be attached to the main house, converted from an existing space, or built as a separate structure. In California, ADUs must include living, sleeping, cooking, and bathroom facilities, making them fully functional homes.

ADUs are becoming more popular because they increase property value, provide extra living space, and offer rental income potential. Their smaller size and lower cost make them a great alternative to buying a new home. In California, state incentives encourage homeowners to build ADUs, helping to increase housing density without changing neighborhood character.

Allowed ADU types include detached ADUs, attached ADUs, garage conversions, and Junior ADUs (JADUs), depending on local regulations.

Most properties with an existing or proposed residential home are eligible to build an ADU, subject to zoning and site requirements.

Yes. Size limits vary by city but typically range from 800 to 1,200 square feet.