Who issues the permit in SeaTac?

The local building department for SeaTac handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.

How do I find out the exact requirements for my project?

Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.

Do I need a permit for plumbing fixture or repiping in SeaTac?

Permit required

Yes. In Washington, plumbing fixture or repiping generally requires a permit, and SeaTac is no exception.

Replacing concealed water, drain, waste, or vent piping is new work under the Uniform Plumbing Code as adopted in chapter 51-56 WAC and needs a permit and inspection; only stopping leaks and clearing stoppages are exempt. Anyone doing plumbing for hire must hold a Washington plumbing certificate and work for a licensed plumbing contractor (RCW 18.106.020); an owner working on their own residence is exempt from certification (RCW 18.106.150). Plumbing permits are issued by the city or county, not by L&I.

Get the checklist for your plumbing fixture or repiping in SeaTac. A free check first, then a free printable Permit Prep Pack.

Documents you may need

Plumbing permit application from the city or countyrequired
Fixture count and pipe material and sizingLikely required
Plumbing contractor license and certified plumber information if hiring outLikely required

Possible inspections

Rough-in plumbing inspection with pressure test before walls are closed
Final plumbing inspection

Frequently asked questions

Do I need a permit for plumbing fixture or repiping in SeaTac?: Yes. In Washington, plumbing fixture or repiping generally requires a permit, and SeaTac is no exception. The documents and inspections sections on this page list what the building department typically asks for.
Who issues the permit in SeaTac?: The local building department for SeaTac handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
How do I find out the exact requirements for my project?: Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.

PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.