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. Please consult the tables below for information regarding the requirements for attached or interior ADUs.

Attached ADU requirements
Minimum unit size 150 sf
Maximum unit size
1,000 sf or 50% of the existing area of the primary dwelling, whichever is greater
Bedrooms 2 max
Minimum setback: front
Same as primary dwelling
Minimum setback: corner side
4 ft
Minimum setback: interior side
4 ft
Minimum setback: rear
4 ft
Maximum height
Same as primary dwelling
Daylight plane
Same as primary dwelling
Permitted to exceed FAR and lot coverage maximum
Yes, if ADU is 800 sf or smaller and built at the same time as, or after, the primary dwelling and other structures
Parking                                                                                                                                                                                                                                                                                  
One off-street parking space required for attached ADUs (OK in tandem/setback configuration). Certain sites are not required to provide parking, see 16.79.080 for details. On-street parking overnight is prohibited in single-family zoning districts. Please see the FAQs for additional information regarding the City's overnight parking prohibition.

Interior ADUs must be within existing space. Conversions of existing space to interior ADUs may maintain existing setbacks provided sufficient distance is required for compliance with fire and life safety building code requirements, per Municipal Code section 16.79.060 b).

Interior ADU requirements
Minimum unit size 150 sf
Maximum unit size 1,000 sf or 50% of the existing area of the primary dwelling, whichever is greater
Bedrooms 2 max
Parking                                                                                                                                                              None required for interior ADUs. On-street parking overnight is prohibited in single-family zoning districts. Please see the FAQs for additional information regarding the City's overnight parking prohibition.

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.

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. On-street parking overnight is prohibited in single-family zoning districts. Please see the FAQs for additional information regarding the City's overnight parking prohibition.