King County building permits

Address

919 SW Grady Way, Suite 300, Renton WA, 98057

Phone

206-296-6600

Hours

In-person: Mon 8:30 am-3:30 pm, Tue 8:30 am-3:30 pm, Wed 9:30 am-3:30 pm, Thu 8:30 am-3:30 pm, Fri closed. Phone: 9-11 am and 12:30-2:30 pm Mon, Tue, Thu, Fri.

Online portal

kingcounty.gov/en/dept/local-services/certificates-permits-l

Building code

2021 Washington State Building Code (2021 I-Codes with WA state amendments, WAC Title 51, and King C…

Jurisdiction

County · Seattle metro

Researched October 13, 2026 from the office's official website. Offices change hours and fees; confirm before you visit. See an error? Report it.

Permit types issued

• Plumbing and Gas Piping Permit (Seattle-King County Public Health)
• Residential Building Permit - Addition or Conversion to Living Space / Garage Addition
• Residential Building Permit - Remodel or Repair (no addition)
• Residential Demolition or Relocation Permit
• Residential Mechanical Permit

Fees, review times and which of these your project needs are in the Deep Permit Report.