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King County, Washington

Licensed Trade Records in King County, Washington

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Browse 13,009 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 (51)

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

Seattle 3089Auburn 1331Kent 1271Renton 1055Federal Way 852Bellevue 781Kirkland 615Redmond 445Woodinville 374Shoreline 274Maple Valley 256Burien 232Enumclaw 231Issaquah 228Tukwila 222Des Moines 191Covington 169Kenmore 153Sammamish 134Seatac 134North Bend 112Pacific 94Mercer Island 75Black Diamond 74Vashon 74Duvall 65Snoqualmie 63Carnation 59Newcastle 56Lake Forest Park 52Fall City 46Normandy Park 46Algona 36Ravensdale 30Clyde Hill 7Woodway 7Ballard 6Bitter Lake 6Bainbridge Is 5Greenwood 5Bryn Mawr 4Juanita 4Medina 4Mountlake Terrac 4Beacon Hill 3Cascade 3Columbia 3Cottage Lake 3Forest Park 3Houghton 3Lake City 3

13009 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

13009 matching records across 51 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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Show registered-address map (25 records on this page)12 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.

14Seattle1ZIP 980051ZIP 981331ZIP 980571ZIP 980231ZIP 980011ZIP 115421ZIP 132091ZIP 248161ZIP 322281ZIP 370321ZIP 98107Approximate postal/city centroid schematic (12 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.
Prepare a project brief

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.