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King County, Washington

Licensed Trade Records in King County, Washington

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Browse 13,229 verified licensed trade contractors registered across King County, Washington (including Seattle, Bellevue, Kent, Renton). Every record is compiled from Washington State Department of Labor & Industries (WA L&I) public credential files under Revised Code of Washington RCW 18.27 (Contractor Registration), RCW 19.28 (Electrical EL01–EL06), and RCW 18.106 (Plumbing PL01/PL02).

Official State Authority: Washington State Department of Labor & Industries (WA L&I) Official Registry · County Seat: Seattle

Municipalities in King County (36)

Select a city or town in King County to view local permit guidance and registered licensed trade records:

Seattle 3109Auburn 1405Kent 1322Renton 1077Federal Way 890Bellevue 796Kirkland 621Redmond 447Woodinville 380Shoreline 276Maple Valley 269Issaquah 234Burien 233Enumclaw 230Tukwila 229Des Moines 191Covington 179Kenmore 164Sammamish 136Seatac 133North Bend 112Pacific 96Mercer Island 77Black Diamond 76Vashon 73Duvall 65Snoqualmie 65Newcastle 62Carnation 59Lake Forest Park 52Fall City 46Normandy Park 46Algona 38Ravensdale 30Clyde Hill 7Medina 4

13229 licensed trade records · King County, WA

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Public Directory Quality: Official WA L&I license records across King County · Zero sponsored order · Never sold as a lead · How our data works →

All trades directory — King County

13229 matching records across 36 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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Show registered-address map (25 records on this page)6 approximate areas

Shaded areas mark approximate postal or city locations, not premises or service areas. Circle sizes are illustrative, not postal boundaries. Some records share the same area. Private addresses are excluded.

20Seattle1ZIP 301751ZIP 186161ZIP 141501ZIP 154011ZIP 13036Approximate postal/city centroid schematic (6 areas)

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Frequently Asked Questions — King County, WA

How are licensed trade credentials verified in King County, Washington?

Records across King County are sourced directly from the Washington State Department of Labor & Industries (WA L&I). Revised Code of Washington RCW 18.27 (Contractor Registration), RCW 19.28 (Electrical EL01–EL06), and RCW 18.106 (Plumbing PL01/PL02)

Which municipalities are covered in the King County directory?

King County coverage includes Seattle, Bellevue, Kent, Renton, Federal Way, Kirkland, Auburn, Redmond, Sammamish, Burien, with County Seat in Seattle.

Are licensed contractors in King County, WA required to carry insurance and surety bonds?

Yes. Under Washington licensing authority regulations, licensed trade contractors typically must maintain active Commercial General Liability insurance, appropriate surety bonds, and state Workers' Compensation coverage before pulling municipal permits.

Other Counties in Washington

Pierce CountySnohomish CountySpokane CountyClark CountyWhatcom CountyThurston CountyBenton CountyFranklin CountyYakima CountyKitsap CountyChelan CountyDouglas CountyGrant CountyWalla Walla CountyMason CountyKittitas CountyLewis CountySkagit CountyCowlitz CountyIsland CountyClallam CountyStevens CountyWhitman CountyAsotin CountyPend Oreille CountyLincoln CountySan Juan CountyJefferson CountyGrays Harbor CountyOkanogan CountyKlickitat CountyAdams CountyFerry County

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
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Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.