Quick answer · Kenmore ADU laws, 2026
In Kenmore, King County, you can now build two ADUs on any single-family lot under Washington's HB 1337 (2023) — with no owner-occupancy requirement, no off-street parking mandate on smaller lots, and DADUs allowed up to 1,000 sq ft.
Kenmore applies HB 1337: two ADUs per single-family lot, attached and/or detached, with no owner-occupancy requirement and DADUs allowed up to 1,000 sq ft. Design standards for an ADU cannot be stricter than those for the primary residence.
Kenmore, at the north end of Lake Washington, offers some of the most affordable ADU-ready lots in King County, with steady rental demand from the Bothell–UW Bothell job corridor and downtown Seattle commuters on SR 522.
Permit Office
Kenmore Planning & Building
Puget Sound ADU Rent (market range)
$1,600–$2,800/mo
NW ADU Builders — serving Kenmore, WA
NW ADU Builders