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Washington has 64,278 registered contractors in this site's directory; King, Snohomish and Pierce counties hold 49.6%
44,484 are general contractors. 2,740 registrations expire before the end of 2026, most of them in November and December.
Counties 路 Northwest Region
King County construction: bids, contractors and projects
WSDOT lettings, registered contractors and project news for King County, Washington, updated daily from public records.
King County is part of our Northwest Region coverage area and falls under WSDOT Northwest Region, headquartered in Shoreline. L&I's contractor data lists 15,818 construction contractors with a King County address: 10,939 registered general contractors and 4,879 registered specialty, electrical and plumbing contractors. The largest single group is Washington registered general contractor (10,939). Most are based in Seattle, Auburn, Kent.
WSDOT's advertised letting schedule has no King County proposals posted right now.
Upcoming WSDOT lettings in King County
No upcoming advertised proposals are posted for King County. Get the daily brief to hear when one is.
Contractors based in King County
Counts come from Washington L&I's contractor license data (active construction, electrical and plumbing contractor registrations with an address whose ZIP code is in King County). Contractors registered with the General specialty are counted as general contractors; the rest as specialty contractors.
- Washington registered general contractor: 10,939
- Washington registered specialty contractor: 3,547
- Washington electrical contractor: 943
- Washington plumbing contractor: 389
Find King County subcontractors Find King County general contractors
King County project news
How to bid public work in King County
State highway work in King County is let by WSDOT; the county is in WSDOT's Northwest Region (WSDOT regions). WSDOT requires prequalification to bid on highway contracts. See how to bid WSDOT contracts.
State agencies buy through WEBS (see the supplier registration guide).
Statewide rules that apply here
Nearby counties
Northwest Region region: Island 路 San Juan 路 Skagit 路 Snohomish 路 Whatcom
Also in WSDOT Region 1: (same as above)
Sources: WSDOT Call for Bids (refreshed daily) 路 L&I contractor license data (data.wa.gov) 路 WSDOT Region 1