Accessory Dwelling Unit (ADU) City Regulations


New or Expanded ADUs: R-0/R-1/R-2/Residential DSP blocks

Conversion ADUs: R-0/R-1/R-1.5/R-1-7/PD/R-2/Residential DSP blocks

Lot Size:

R-0 require min. 6,000 sq.ft.

R-1 require min. 8,500 sq.ft.

R-2/Residential DSP blocks require min. 5,000 sq.ft. (R-2 also require a 1,000 sq.ft. open space minimum)

Conversion ADUs have no minimum.

Maximum ADU Floor Area:

Min. 150 sq.ft., max. 700 sq.ft.

Number of Bedrooms:

No min/max


No min/max


Require separate bathroom and kitchen facilities (permanent range, counters, refrigerator and sink).


In addition to required spaces for primary dwelling, one off-street parking space must be provided for each ADU, can be in tandem on existing driveway.

Parking Exceptions:

No parking space is required if unit:

  1. Is located within one-half mile of major transit stop.

  2. Is located within a designated historic district.

  3. Is part of existing main dwelling or existing residential accessory structure intended for human habitation.

  4. When on-street parking permits required but not offered to the occupant of AD.

  5. Has car share vehicle located within one block of ADU.

  6. Is permitted as a Junior ADU.


All setback, lot coverage, building height, open space, design review and other applicable zoning requirements in Title 19 shall be satisfied, except as permitted by variance.


15' unless approved with use permit (19.40.020)


Cannot be placed in front of main dwelling.

Rear Yard Coverage:

Lot coverage zoning requirements found in Title 19 must be satisfied.


Exterior materials, colors and appearance to match primary structures on same lot. Minimal exterior changes are allowed for Conversion ADUs.


Entrances and outside stairways serving ADU shall not be constructed on any building elevation facing public street.

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