What is an Accessory Dwelling Unit (ADU)
An ADU, often called a guest house or more popularly, a tiny house, is a secondary housing unit with completely independent living facilities such as kitchens and bathrooms. ADUs are known by many names including granny flats, small houses, in-law units, or guest houses. These units are typically constructed in a residential neighborhood adjacent to a primary housing unit on the lot. It is owned by one owner on a single family lot.
Characteristics of an ADU:
- An ADU is adjacent or an accessory to a single family home where both units are part of the same property and owned by one owner.
- An ADU is smaller than the average home in California. A typical ADU ranges anywhere from 450 to 1000 square feet.
- An ADU has different requirements to build than a single family home. Some cities also have specific ordinances around the use of an ADU.
- While designed to be used as a separate residence, an ADU will share a mailing address with the primary residence.