The Building Code establishes minimum requirements for habitable structures. The ADU must not exceed 800 square feet, and the City recommends the minimum size not to be below 200 square feet.
The ADU must be between 190 and 800 square feet. There must be at least one habitable room with a minimum gross floor area of 120 square feet (11m2) and a minimum length of 7 feet. Other rooms must be at least 70 square feet (6.5m2). If a room has a sloping ceiling, any part of that room with a ceiling below 5 feet in height is not considered as habitable.
The detached ADU cannot exceed 16 feet in height, including when added above a garage.
Detached garages over 800 square feet, with or without an ADU, require a Conditional Use Permit (ask staff for details).
There must be a separate entry for the ADU.
The ADU must match the character of the main house.
See “Zoning and Design standards” for more requirements.