KCC Title 21A grants density bonuses, height increases, and reduced parking when projects in unincorporated King County provide deed-restricted affordable housing or other public benefits.
KCC 21A.34 affordable housing incentives let developers build above the base density when they set aside units for households at or below specified area median income levels for at least 50 years. Bonuses scale with the depth of affordability and apply most strongly within urban growth boundaries near transit. Cities like Seattle, Bellevue, Redmond, and Kirkland run their own Mandatory Housing Affordability or incentive zoning programs that layer on top of state law RCW 36.70A.540.
Failure to record covenants or maintain affordability triggers permit revocation, monetary recapture of the bonus value, and denial of future incentives across King County jurisdictions.
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
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
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
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 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
EV charging in Auburn follows the Washington State Energy Code, which requires EV-ready capacity in new multifamily and commercial parking and protects publi...
Side-by-side rule comparisons with other cities in King County.
See how Auburn's density bonus law rules stack up against other locations.
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