Licensed Construction Contractors in Mercer Island

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

Of the 244 construction contractors licensed in Mercer Island County, 146 are operating on an expired license, or 59.8%. 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 244 of 244

Before you hire in Mercer Island 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.