What’s new with King County Permits?

New state regulations related to co-living housing

On January 1, 2026, Washington State regulations related to co-living housing, or congregate residences, go into effect. The King County Code has not been updated yet to reflect these changes. Please see a brief summary of the new regulations on our legislation page. We have updated the King County Permits website to include not only proposed legislation that we’re working on, but also state regulations that preempt King County Code.

Dashboard: how long it takes to get a residential permit decision

See turnaround times for plan review and permit issuance related to residential new construction and residential additions and alterations.

Go to the dashboard

Other agency approval requirements

To avoid delays in your application or project, be sure to obtain all requirements from other agencies such as with Public Health or The Historic Preservation Program. You will need to apply for and obtain approval from these other agencies prior to submitting your application with King County Permits.

Is your property serviced by a septic system?

• If so, please submit your application with King County Public Health for review and approval. Once you have your approval you can make application with King County Permits for your building, land use, or site development permit.
• Be sure to include your approval from Public Health when resubmitting your application with us.
• If you do not have the proper approvals from Public Health, your application will not be considered a complete application, and you will be required to complete this step before reapplying with us.  

Is your property flagged as possibly Historic?

• During the screening and intake phase of your application with us, it may be determined that your property is flagged as possibly Historic. If so, we will let you know and provide you with instructions on next steps for obtaining a Cultural Resources Determination. 
• Be sure to include your approval from The Historic Preservation Program when resubmitting your application with us.
• If you do not have the proper approvals from The Historic Preservation Program, your application will not be considered a complete application, and you will be required to complete this step before reapplying with us.  

Forms, checklists, and information sheets

• Our updated checklists outline all requirements to help you submit a complete application packet.
• Submitting a complete application is key to reducing delays and maximizing your chances of acceptance.

Forms, checklists, and information sheets

Stay informed

• Don't miss out on important updates—Bookmark this page and check back often for the latest updates, tools, and resources.
• We are committed to keeping you in the loop with the most recent changes and enhancements to King County Permits.