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Apply for a commercial and multi-family permit
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Property research
Use our property research and maps to check jurisdiction and zoning to determine whether your property is located in unincorporated King County or within city limits. -
Schedule a pre-application meeting
Pre-application meetings are held between a prospective permit applicant and Permitting Department staff before a permit application is filed.
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Download needed applications
Find and download the application materials that align to your project on our permit application forms listed by packet page.
Commercial, mechanical forms are available on the MyBuildingPermit website.
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Plan review
We perform a review of the application for code compliance and safety requirements.
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Set up inspections
We inspect work for code compliance and safety requirements.
Pre-Applications
Pre-Application Meeting Request
Pre-Application Meeting Requests and Waivers
Pre-Application Waiver Request
Commercial Construction
Bulletin 8: Commercial and Multi-Family Building Permits
Application, permit; Applicant Affidavit
Approval of Building Permit Application; Seattle - King County Public Health Department
Application for Approval of Building Permit
Applicant Status
Public Agency, or Public Utility or Private Utility (1.06MB)
Corporation or Business Association (1.05MB)
Energy Code Worksheets for Commercial Construction
Lighting Budget Calculation Form
Landscape Bond Quantity Worksheet Form
Residential Density Calculation
SEPA Checklist
SEPA Greenhouse Gas Emissions
Worksheet Instructions (182KB)
Worksheet (spreadsheet) (211KB)
SEPA Only Submittal Process
Sewer Availability
Certificate of Sewer Availability (200KB)
Site Areas Worksheet
Site Plan and Temporary Erosion and Sediment Control (TESC) Template and Example
See, Computer Aided Design (CAD) Templates and Other Data Resources packet
Solar Photovoltaic Systems, Incentives and Permitting Guidance
Water Service Requirements
Commercial Structure Additions
Permit Guide, Commercial Additions
Commercial Additions Application Guide (281KB)
Water Service Requirements
Commercial - Tenant Improvements
Change of Use, Tenant Improvement
Energy Code Worksheets for Commercial Construction (2018 WSEC with King County amendments – found in KCC 16.07)
Lighting Budget Calculation Form
For 2021 WSEC projects, please use state forms found at WSEC Commercial Technical Support Website
Tenant Improvement
Sewer Availability
Certificate of Sewer Availability
Site Plan and Temporary Erosion and Sediment Control (TESC) Template and Example
See, Computer Aided Design (CAD) Templates and Other Data Resources packet
Water Service Requirements
Commercial - Sign
Bulletin 8: Commercial and Multi-Family Building Permits
Sign Permits
Site Plan and Temporary Erosion and Sediment Control (TESC) Template and Example
See, Computer Aided Design (CAD) Templates and Other Data Resources packet
Cellular Communcation Facilities
Cellular Communication Antenna and Tower Applications
Available on MyBuildingPermit.com
Cellular Communication Antenna and Tower
Cellular Communication Antenna and Tower - Supplemental Information
Site Areas Worksheet
Landscape Bond Quantity Worksheet Form
SEPA Checklist
See, State Environmental Policy Act (SEPA) Process packet
Site Plan and Temporary Erosion and Sediment Control (TESC) Template and Example
See, Computer Aided Design (CAD) Templates and Other Data Resources packet