Plumber license in Washington

Application requirements

Working as a plumber in Washington typically requires submitting an application packet to the Washington L&I — Plumber Certification — including proof of experience, exam scores, and insurance.

• Proof of relevant trade experience or apprenticeship hours
• Passing score on the state trade exam(s)
• General liability insurance + workers' comp
• Surety bond filed with the board (when required)
• Business entity registration with the Secretary of State
• Background check + license fee submitted with packet

This is the standard packet most U.S. state boards require. Verify the exact list with the Washington L&I — Plumber Certification before applying — requirements change by trade classification.

Fees and renewal cycle

Total cost to become a licensed plumber in Washington ranges from $200 to $8,500 (typical $1,500). The range covers application + exam fees, bond + insurance premiums, and the first year of business registration.

Most state boards renew on a 1-3 year cycle and require continuing education credits. Verify the exact renewal window and CE requirement with the Washington L&I — Plumber Certification — late renewal typically triggers a reinstatement fee.

Reciprocity with neighboring states

Washington borders 2 other launched states ProFix Directory tracks. Reciprocity is set by each state board individually — check the destination state for the current rule before relying on it.

• Plumber license in Idaho →
• Plumber license in Oregon →

Where to apply

Why ProFix verifies every plumber

Every pro we list in Washington is matched against the Washington L&I — Plumber Certification record, the Secretary of State business registry, and OSHA inspection data. We surface license status, revocation history, and bond filings on every profile so homeowners can shortlist verified pros without trusting a single review-platform score.

See the full verification methodology →

Common questions

Do I need a plumber license in Washington?

Washington requires plumber contractors to hold a Washington Plumber license from the Washington L&I — Plumber Certification. Apply through https://lni.wa.gov/licensing-permits/plumbing/ with a typical $1,500 total fee (range $200-$8,500) and a 1-3 year renewal cycle. Verify the exact classification with the board before submitting.

Which board handles plumber licensing in Washington?

Washington L&I — Plumber Certification is the relevant authority shown in the Washington licensing seed for this page. The verification or application URL in the loader is https://lni.wa.gov/licensing-permits/plumbing/.

How much does a plumber license cost in Washington?

The recorded licensing cost range is $200-$8,500, with a typical total around $1,500. That range comes from the page loader and covers application, exam, bond, insurance, or registration costs where they apply.

What requirements should Washington plumber applicants verify?

Washington requires all construction contractors to register with the Department of Labor & Industries (L&I) as a General or Specialty contractor. Electricians and plumbers are licensed by L&I trade boards.

Are WA plumbers licensed?

Yes. L&I certifies Pumber (PL-01), Specialty Plumber, and Plumbing Trainee categories statewide.