Seattle identifies Public Health - Seattle & King County as the plumbing-code enforcement authority.
DOWNTOWN SEATTLE / GUIDE
Seattle Plumbing Permit Record
The code contains permit requirements and limited exemptions; project applicability needs official confirmation.
PRACTICAL GUIDE
Define the written plumbing scope
Track the authority, applicant, scope, code edition, application, issuance, inspections, corrections, and closure.
Even listed exempt work must comply with the code.
Ask the enforcing authority what applies
Separate repair, replacement, alteration, new work, fixture work, private water service, side sewer, and other project elements before asking about permits. Seattle identifies Public Health - Seattle & King County as the plumbing-code enforcement authority; current requirements still depend on the actual scope.
Write the permit role and inspection sequence into the accepted scope.