Kirkland ADU rules — the most predictable Eastside permit path
Kirkland Zoning Code Chapter 115 plus the City's pre-application process produce the shortest median permit timeline on the Eastside.

Code at a glance
Kirkland Zoning Code Chapter 115 allows one AADU and one DADU per single-family lot, post-HB-1337 alignment. Maximum DADU size is 1,000 sq ft, height limits 18 feet flat / 24 feet pitched in most RS and RSX zones.
Setbacks are 5 ft side / 5 ft rear for single-story DADUs, with stepped increases for second-story walls — comparable to Seattle's NR zones.
Sources:City of Kirkland
Why Kirkland is fast
Kirkland's planning desk staffs an ADU specialist who reviews submittals in batches twice a week. Combined with the pre-application meeting requirement (which catches most issues before formal submittal), median permit timelines run 10–12 weeks — meaningfully faster than Seattle.
MRSC's regional ADU resource page is the cleanest source for cross-jurisdiction comparison.
Sources:Municipal Research and Services Center of Washington
Watch-outs
Critical-areas overlays around Forbes Lake, Juanita Creek, and the Yarrow Bay watershed add wetland buffers that can erase buildable backyard area. Confirm overlays via the City's GIS portal before assuming a DADU footprint will fit.


