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Concrete in King County, Washington

Browse 173 verified concrete registered across King County, Washington (including Seattle, Bellevue, Kent, Renton, Federal Way, Kirkland). 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 (15)

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

Seattle 42Kent 21Auburn 18Enumclaw 15Renton 14Maple Valley 9Bellevue 8Shoreline 7Kirkland 6Burien 5Federal Way 4Redmond 4Woodinville 4Black Diamond 3Des Moines 3

173 concrete 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 →

Concrete directory — King County

173 matching records across 15 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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.