Plumbing Permit in Seattle, Washington

Permit required?

Yes, a permit is required.

When a permit is usually needed

For all residential plumbing and gas piping work in Seattle

Permit cost and what affects it

Fees are set by the locality and are not published here. See the official fee schedule or contact the office for current amounts.

Permit costs generally depend on the project valuation, the scope of work, and the inspections required. Ask the office how the fee is calculated for your specific project.

Where to apply

• Official permit page

Frequently asked questions

Do you need a plumbing permit in Seattle?

Residential plumbing and gas piping permits in Seattle are issued by Public Health Seattle and King County, not by SDCI. All piping inside the building is regulated by the health department. A permit is required whenever plumbing is installed, relocated, or modified. Homeowners may do their own work but must obtain a permit and schedule inspections. Always confirm with the Public Health Seattle and King County before starting.

How much does a plumbing permit cost in Seattle?

Fees are set by Seattle and are not published here. Contact the office for current amounts.

How long does a plumbing permit take in Seattle?

Processing time for a plumbing permit in Seattle varies by workload and project scope. Contact the Public Health Seattle and King County for a current estimate.

Where do you apply for a plumbing permit in Seattle?

Apply through the Public Health Seattle and King County. The official permit page and contact details are listed on this page.

Official sources

• https://kingcounty.gov/en/dept/dph/health-safety/environmental-health/plumbing-gas-piping/applications-and-permits/
• https://www.seattle.gov/sdci/codes/codes-we-enforce-(a-z)/plumbing-code