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Most King County offices will be closed on Monday, May 28, for Memorial Day.  
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We do NOT issue the following permits, but they may be required with a building permit (see below):

  • Plumbing and on-site septic systems
  • Electrical wiring
  • Elevators

Department of Permitting customers needing plumbing and on-site septic system permits need to contact the Department of Health - Environmental Health Services Division.

Plumbing and on-site septic system permits

In unincorporated King County, permits that are required for gas piping, plumbing, and on-site septic systems for construction are administered and permitted by Public Health - Seattle & King County. For more information, see Septic systems vs. sewer and Health Department review, or refer to plumbing information at www.kingcounty.gov/healthservices/health/ehs/plumbing.aspx and for septic system information www.kingcounty.gov/healthservices/health/ehs/wastewater.aspx.

Electrical wiring permits

In unincorporated King County, the design, installation, or modification to electrical wiring is permitted through the Washington State Department of Labor and Industries (L&I). For more information, refer to L&I's Web site at www.lni.wa.gov/TradesLicensing/Electrical.

Elevator permits

In unincorporated King County, elevator permits also are administered by the Washington State Department of Labor and Industries (L&I). For more information refer to L&I's Web site at www.lni.wa.gov/TradesLicensing/Elevators.