Verify a Contractor's License in Washington

Search the official Washington State Department of Labor & Industries records to confirm any Washington contractor is properly licensed before signing a contract. Free public lookup, updated weekly.

About Washington Contractor Licensing

The Washington State Department of Labor & Industries regulates contractor licensing in Washington. All construction contractors must register with L&I.

Population served: 7.8M residents.

Licensing authority: Washington State Department of Labor and Industries.

General contractor license required: Yes.

Official board website: https://www.lni.wa.gov/licensing-permits/contractors/

Notable Trades Licensed in Washington

How to Verify a Washington Contractor

  1. Ask the contractor for their full legal name and license number.
  2. Search the ProLicenseCheck database above, or visit the Washington State Department of Labor & Industries directly.
  3. Confirm the license is currently active, not expired or suspended.
  4. Check whether the license type matches the work being performed.
  5. Verify the address and contact information on file matches what the contractor provided.

Why License Verification Matters

Hiring an unlicensed contractor in Washington can leave you legally and financially exposed. Unlicensed work often voids homeowner insurance claims, can prevent property sales, and leaves you with no recourse if the work is defective.

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