Guides · State ladders
Washington's Department of Labor & Industries (L&I) sets the PL01 journey-level gate at 8,000 hours — with a condition that quietly runs the whole apprenticeship: at least 4,000 of those hours must be commercial or industrial.
A trainee in a residential service shop can pile up 8,000 hours and still be 2,000 hours short of the license, because residential hours do not fill the commercial bucket. The time to learn this is when you choose where to train — or when you still have years left to rebalance — not at the application window.
Hours must be worked as a registered trainee under a certified journey-level plumber. Washington's reciprocity is the narrowest in the West: at journey level it endorses Idaho only; everyone else may present a license “for consideration” — a review, not a right.
Check your commercial split in the eligibility checker; full rules on the Washington ladder page.
