King County Code Title 21A controls house bulk through floor-area, lot-coverage, and height limits rather than a dedicated mansionization ordinance, with stricter standards in rural and Vashon Island zones to preserve neighborhood character.
Unlike Los Angeles, King County does not have a dedicated mansionization ordinance, but the Zoning Code (KCC Title 21A) controls oversize single-family homes through several tools: maximum lot coverage, floor-area-ratio limits in some overlays, structure height caps, and setback requirements. Rural Area, Vashon-Maury Island, and Snoqualmie Valley zoning use stricter floor-area and lot-coverage standards to protect character and critical areas under KCC Title 24. Cities inside King County apply their own bulk standards, with Seattle's neighborhood overlays and Bellevue's R-zones being notable examples. Local Services Permitting reviews bulk compliance during single-family permit review.
Building beyond the lot coverage, height, or floor-area limits in KCC Title 21A is a zoning violation, triggering stop-work orders, redesign requirements, and possible removal of nonconforming construction.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Auburn, WA
Federal law preempts local aircraft noise. Auburn Municipal Airport follows FAA Part 150 and Sea-Tac overflights are under FAA and Port of Seattle. ACC 8.28 ...
Auburn, WA
Industrial sources into residential zones are capped at 60 dBA day and 50 dBA night under WAC 173-60 via ACC 8.28. The Boeing Auburn plant and Valley warehou...
Auburn, WA
Outdoor concerts and festivals must meet ACC 8.28 limits and often need a special event permit. Downtown Auburn and Les Gove Park events follow a written noi...
Auburn, WA
Auburn applies WAC 173-60 EDNA limits through ACC 8.28. Residential: 55 dBA day, 45 dBA night. Industrial receiving: 60 dBA day, 50 dBA night. Measured at th...
Auburn, WA
Auburn restricts RV, trailer, and boat parking on public streets to 72 hours and sets additional limits on driveway and front-yard storage of recreational ve...
Auburn, WA
Auburn does not impose a citywide overnight parking ban, but enforces the 72-hour rule, signed time-limited zones, and no-parking signs at parks, trailheads,...
See how Auburn's anti-mansionization rules stack up against other locations.
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