Single-family residential accessory dwelling units

Properties developed with a single-family residence may construct up to two accessory dwelling units (ADUs), one that is detached and one that is either attached, interior or junior. These ADUs may be created through the conversion of existing spaces. Any ADU that is created from existing space, either within the primary dwelling or detached accessory building, may retain the setbacks of the existing structure. The tables below outline requirements for attached, detached and junior ADUs. For full details regarding development regulations related to ADU proposals on properties developed, or proposed to be developed, with a single-family residence, please review the online Municipal Code, section 16.79.050. Please review Municipal Code section 16.79.060 b) for details regarding setbacks for conversions.

Attached and interior ADUs


An attached ADU is a unit that is constructed as a physical expansion (i.e., addition) of an existing primary dwelling unit, including a new basement underneath a primary dwelling unit. An interior ADU is a dwelling unit that is contained within the existing space of a primary dwelling unit, including within its living area, basement, or attached garage or constructed as part of a proposed primary dwelling unit. Requirements for attached and interior ADUs vary by size. Regulations differ for ADUs up to 800 sf, and for ADUs between 801 sf and the maximum size of 1,000 sf. Please consult the table below for information regarding the requirements for attached or interior ADUs. As interior ADUs must be within existing space, setback information pertains to attached ADUs only. Conversions of existing space to interior ADUs may maintain existing setbacks, per Municipal Code section 16.79.060 b).

ADU requirements ADUs up to 800 sf ADUs 801-1,000 sf
Minimum unit size 150 sf 150 sf
Maximum unit size 800 sf 1,000 sf or 50% of the existing area of the primary dwelling, whichever is greater
Bedrooms 2 max 2 max
Minimum setback: front same as primary dwelling same as primary dwelling
Minimum setback: corner side sufficient for compliance with fire and life safety sufficient for compliance with fire and life safety
Minimum setback: interior side sufficient for compliance with fire and life safety sufficient for compliance with fire and life safety
Minimum setback: rear sufficient for compliance with fire and life safety sufficient for compliance with fire and life safety
Maximum height same as primary dwelling same as primary dwelling
Daylight plane same as primary dwelling same as primary dwelling
Permitted to exceed FAR and lot coverage maximum Yes, if built at the same time as, or after, the primary dwelling and other structures No                                                                     
Parking                                                                                                         One off-street parking space required for attached ADUs (OK in tandem/setback configuration). Interior ADUs and certain sites are not required to provide parking, see 16.79.080 for details

Detached ADUs


A detached ADU is a dwelling unit that is constructed as a separate structure from the primary dwelling unit, contained within the existing space of an accessory structure, or constructed as an addition to an existing or proposed accessory building. Requirements for detached ADUs vary by size for units up to 800 square feet and those between 801 square feet and the maximum size allowed, 1,000 square feet. Please consult the table below for information regarding the requirements for detached ADUs. Conversions of permitted accessory buildings to detached ADUs may maintain existing setbacks per Municipal Code section 16.79.060 b). 
                                           
ADU requirements ADUs up to 800 sf ADUs 801-1,000 sf
Minimum unit size 150 sf 150 sf
Maximum unit size 800 sf 1,000 sf
Bedrooms 2 max 2 max
Minimum setback: front same as primary dwelling same as primary dwelling
Minimum setback: corner side 4 ft same as primary dwelling
Minimum setback: interior side 4 ft same as primary dwelling
Minimum setback: rear 4 ft 10 ft
Maximum height 16 ft 17 ft
Daylight plane n/a at 3 ft setback, measure up 9.5 ft, then slop inwards at 45 degrees
Permitted to exceed FAR and lot coverage maximum Yes, if built at the same time as, or after, the primary dwelling and other structures No                                                                     
Parking                                                                                                         One off-street parking space required (OK in tandem / setback configuration). Certain sites are not required to provide parking, see 16.79.080 for details

Junior ADUs


A Junior accessory dwelling unit (JADU) means a dwelling unit that is no more than 500 square feet in size and contained entirely within an existing or proposed single-family dwelling. A JADU shall include cooking facility with appliances and a food preparation counter and storage cabinets that are of reasonable size in relation to the size of the JADU. A JADU may include separate sanitation facilities or may share sanitation facilities with the primary dwelling. A JADU must have exterior access separate from the primary dwelling. Please review section 16.79.070 for full details regarding regulations applicable to JADUs.