How to get a plumbing contractor license in Washington
Washington plumbing contractor licensing covers hours, prerequisites, exam path, fees, and renewal. Confirm current rules on the board source before you apply.
Verified on: 2026-09-14 · Board source
From the board
- Licensing Requirements ## Plumbing Licensing Requirements In 2020, the Legislature passed significant changes to plumbing laws (SB 6170).
- This page highlights a few of the changes, including the creation of a new plumbing contractor license.
- Plumbing and related industries worked together to propose the changes to address certified plumber shortages, expand plumber training opportunities, and increase consumer protection.
- ### Plumbing Contractors Beginning July 1, 2021, the “specialty plumbi
- Board page: Licensing Requirements
Requirements overview
- Washington sets experience, education, and exam rules for plumbing contractor applicants
- Documented OJT or apprenticeship hours are common for journeyman / technician paths
- Master and contractor tracks usually add experience, exams, and firm paperwork
- Confirm current hour totals, affidavits, and fees on the state board before you apply
Exam
- See the Washington plumbing exam guide for vendor, scheduling, and prep
- LicenseFlo helps with paperwork and reminders — we do not sit the exam
Renewals
- Most credentials renew on a fixed cycle with mandatory CE or training
- Roster watch → intake → assemble → sign → submit
Related: Exam · Renewal and CE
Have LicenseFlo do it
From $79 per event. Text once; we collect photos, assemble the packet, and send a one-tap signature.