Licensed Plumbing Contractors in Seattle

Every plumbing contractor on record with the Washington State Department of Labor & Industries in Seattle County, Washington, with current license status computed August 17, 2026. Listed A to Z; use the filters to narrow it.

Of the 140 plumbing contractors licensed in Seattle County, 39 are operating on an expired license, or 27.9%. That is worth checking before you sign anything: an expired license can invalidate your permit and complicate an insurance claim if the work goes wrong.

Looking to hire rather than to check someone? Filter the list below by name, or use the Active chip to hide anyone whose license has lapsed.

Licensees 1 to 140 of 140

Before you hire in Seattle County

1. Match the license number on this page to the name on the contract. Licenses belong to a person or a company, not to a crew.
2. Confirm the record at L&I directly. This page mirrors their daily file, but they are the authority.
3. Ask for a certificate of insurance separately. L&I licensing does not verify that a contractor carries liability coverage.
4. Get the license number written into the written estimate.