Commercial building permit
What is the purpose of a commercial building permit?
A commercial building permit is required in unincorporated King County to construct a new commercial building structure or for certain tenant improvements to assure the development is consistent with building codes and other applicable regulations.
What activities require this permit?
A commercial building permit is required for:
- a new commercial building structure
- tenant improvements if you plan to finish or remodel an existing building shell
- mechanical (HVAC) or fire systems
- changes in occupancies
- installation of new or changes to existing signs and cellular antennas.
Typically, a commercial building permit will require other related permits, administered by the Permitting Department or by other agencies.
Please note: Commercial building permits often require State Environmental Policy Act (SEPA) review. See SEPA Process* for more information.
How much will it cost?
Please refer to the Permitting Department's current fee schedule for an estimate.
Where can I get an application?
- Refer to the following packets for application materials:
- Request an application packet by mail by calling Permitting Department's customer service at 206-296-6600 or
- Pick up an application packet at the Permitting Department in Snoqualmie (see map and directions).
How do I submit my application?
Refer to pre-applications as a commercial building permit often requires a pre-application meeting prior to application submittal and to the Permitting Department's customer information bulletin 53, Project management for building permits*, for information about projects that require a Project Manager. For more information, see Applying for a permit at the Department of Permitting.
What is the timeline for processing a commercial building permit?
Varies depending on permit decision type (refer to Title 20* of the King County Code).
Notes / Comments
For more information:
Title 16* of the King County Code
The Department of Permitting and Environmental Review
For questions, please contact the Permitting Department's customer service at 206-296-6600.
*Note: To view PDFs, free software from Adobe is required. See helpful hints for assistance.
To request this information in alternate formats for people with disabilities, call 206-296-6600 or TTY Relay: 711.