A residential building permit is required in unincorporated King County to construct a new residential building structure or for certain improvements to assure the development is consistent with building codes and other applicable regulations. Per legal authority of Title 16* of the King County Code.
What activities require this permit?
- A new residence, mobile home, or accessory dwelling unit
- Any accessory structures such as garages and storage structures (detached storage building less than 200 square feet in area are exempt)
- Improvements and additions to existing residences or accessory structures
- Decks over 30" above grade; retaining walls over 4' height; and fences over 6' in height
- Heating and air-conditioning systems, fireplaces, woodstoves and other heating devices or ventilation systems
- Relocation or demolition of a structure
- Changing the use of a home to a daycare, adult family home or a home occupation.
- A basic residential permit also is available for builders who have a previously approved registered plan and intend to construct the same house on one or more building sites (see our Bulletin #12A, Residential Basics Program*).
- Please see related permits administered by other agencies that typically are required with a residential building permit.
Refer to the current fee schedule for a cost estimate.
Where can I get an application?
- Refer to the following packets for application materials:
- Request an application packet from us by mail. Just call us at 206-296-6600.
- Pick up an application packet at the office in Snoqualmie (see map and directions).
How do I submit my application?
See Applying for a permit at the Permitting Department and Drop-offs: Permits accepted by drop-off or mail*. Note that some permits can be issued over the counter. For an over-the-counter submittal, make an appointment by calling 206-296-6797. Or call us at 206-296-6600.
What is the timeline for processing a residential building permit?
Varies depending on permit decision type (refer to Title 20* of the King County Code).
For more information:
- Bulletin #7: Mobile Home Permits*
- Bulletin #9: Obtaining a Residential Building Permit*
- Bulletin #10: Building On or Near Waterfront*
- Bulletin #12: Residential Permit Process*
- Bulletin #29: Drainage Review*
- Bulletin #35: Permits for Relocating Buildings*
- Bulletin #36: Mechanical Permits*
- Bulletin #39: Residential Fire Sprinkler Systems*
- See related permits
- See shorelines