Carports in unincorporated King County require a building permit and must meet zoning setbacks. Detached carports under 200 sqft may be exempt from permit but still must meet setbacks and critical-area rules.
A carport in unincorporated King County is regulated as an accessory structure under KCC Title 21A. An attached carport needs a building permit under KCC Title 16 and must meet the side and rear setbacks for the underlying residential zone (commonly 5 feet side and 10 feet rear in R zones, with larger rural setbacks in RA zones). Detached accessory structures under 200 square feet and not attached to a dwelling are typically exempt from building permits under IRC Section R105.2, but they still must comply with setback and critical-area rules. Carports add impervious or partially impervious area; projects that push total new impervious surface over 2,000 square feet may require stormwater review under the King County Surface Water Design Manual. In critical areas such as steep slopes, shoreline setbacks, or wetland buffers, carports are generally prohibited or require variance review. Height typically is capped at 15 feet for one-story accessory structures or the underlying zone limit. Carports must have a Class A or B roof covering in designated wildfire hazard areas per the Wildland Urban Interface Code. HOAs in developments like Sammamish Plateau, Klahanie, and Snoqualmie Ridge often restrict carports, preferring enclosed garages.
Unpermitted carport over 200 sqft: stop-work plus double fees. Setback encroachment: correction or removal order. Carport in critical-area buffer: restoration plan.
King County, WA
In unincorporated King County, fences 6 feet or less in height may be built on or within property lines without a building permit. Fences over 6 feet require...
King County, WA
Unincorporated King County's marine shoreline along Puget Sound and Vashon-Maury Island is regulated under the Shoreline Management Act (RCW 90.58), the King...
King County, WA
In unincorporated King County, an above-ground pool that can hold water more than 24 inches deep is regulated as a swimming pool under the Washington State R...
King County, WA
Unincorporated King County requires private swimming pools to be enclosed by a barrier at least five feet high under K.C.C. 16.70.020, with self-closing/self...
King County, WA
King County Ordinance 18467 (2017) limits county cooperation with federal immigration enforcement, and Washington's Keep Washington Working Act (RCW 10.93.16...
King County, WA
Washington's Paid Family and Medical Leave program (RCW 49.86) provides up to 12 weeks of partially paid leave, and RCW 49.46.200 requires employers to provi...
See how King County's carport rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.