Directory of Plumbers

Licensing · Washington

Plumber licensing in Washington

57 plumbing businesses from Washington are listed on this directory, all labelled Unclaimed unless a business has joined and passed checks. This page states who licenses plumbers in Washington and where that license is verified.

Who licenses plumbers in Washington

Washington certifies plumbers (journey level and specialties) and registers construction contractors through L&I. The Verify tool shows certification, contractor registration, bond, and insurance status together.

How to verify a license

  1. Ask the business for its license number and the exact name the license is issued to.
  2. Search the L&I Verify tool and match the name to the business you are hiring.
  3. Confirm the classification covers your type of work, the status is active, and the expiration date is in the future.
  4. Check insurance separately: ask for a certificate of insurance. A license and insurance are different checks.

Washington metros on this directory

Questions about plumber licensing in Washington

Who licenses plumbers in Washington?

Department of Labor and Industries (L&I). The model in Washington is: state licensing.

How do I verify a plumber's license in Washington?

Ask the business for its license number and the exact name on the license, then confirm in the official register that the name matches, the classification covers your work, the status is active, and the expiration date is in the future.

Does a license in another state count here?

No. A plumbing license authorizes work only in the jurisdiction that issued it. In local-licensing states, it may not cover the next city.

Method and cautions: plumber licensing by state (guide) · how we verify · Get matched free