Do I Need a Permit?

When is a permit required?
Snohomish County regulates the construction of many different types of buildings. Most structures require the applicant to submit a building permit application and site development plan. Residential building permits can be divided into four basic categories:
  • Single Family Residential (RK)
  • Manufactured Homes (MH)
  • Accessory Buildings (AB)
  • Other residential permits
When is a permit not required?
Common examples are non-habitable structures under 400 square feet in rural zones and non-habitable structures under 200 square feet in urban zones and uncovered decks constructed 30 inches or less from ground level.
Please refer to assistance Bulletin # 74 for other projects that are exempt from building permit requirements. Please keep in mind that exempt structures may not require building permits but they must still comply with distances from property lines as well as environmental regulations.
If your project is listed below and you wish to start the process click here to START

The links below are provided for more information because some projects have additional requirements.
* indicates permits available online at MyBuildingPermit.com
Single Family Residential (RK)
Addition
Residence
Duplex
Garage with Living Space
Guest House
Attached Accessory Apartment
Detached Accessory Apartment
Interior Remodel*
Manufactured Homes (MH)
Mobile Home
Mobile Home in Mobile Home Park*
Modular Home
Temporary Dwelling
Residential Accessory and Non Accessory Buildings (AB)
Agricultural Building
Aircraft Hanger
Boat House
Bridge
Carport
Covered Porch
Deck
Dock
Fence
Garage/Storage Building
Retaining Wall
Swimming Pool
Vault/Drainage
Other Residential Permits
Alteration
Conversion
Demolition*
Modification
Re-Roof*
Roofing
Plumbing*
Mechanical*
Inspection Report
Pre-Application Conference
Lot Status
Land Disturbing Activity Permit 
Flood Hazard
Shoreline Permits

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