What are the Commercial Plumbing Systems permit rules in Washington?

Washington enforces trade permit fee schedules determined by local AHJ building departments per county. General contractors and sub-trades must maintain active state licenses and bond filings ($10,000–$50,000).

Are sub-trade contractor surety bonds required in Washington?

Yes. Most Washington municipal building departments require trade contractors to file an active license bond prior to permit issuance.

🚿 STATEWIDE TRADE HUB (WA) 1 County Workstations

Washington Commercial Plumbing Systems Permit Guide

Fixture unit calculations, backflow preventers, and water main tap permits. Compare municipal fee structures, plan check add-on rates, and contractor bond thresholds across Washington.

Washington Commercial Plumbing Systems County Workstations

Select a county building department to calculate exact trade permit fees & bond rules

King County

King County Dept of Local Services & SDCI

2026 Verified

Plan Review Rate: 35%

Tech Surcharge: 4%

Mandatory Surety Bond: $12,000

Open King County Commercial Plumbing Systems Workstation →