ADUs across Kitsap County
Each city and the county run their own ADU permits. Pick your area for the rules that apply, which plans you can use and where to apply.
Bainbridge Island
City
ADU rules and plans →County plans freeBremerton
City
ADU rules and plans →County plans freePort Orchard
City
ADU rules and plans →County plans freePoulsbo
City
ADU rules and plans →County plans freeSilverdale
Unincorporated urban growth area
ADU rules and plans →County plans freeKingston
Unincorporated urban growth area
ADU rules and plans →County plans freeUnincorporated Kitsap, urban
Central Kitsap and other urban growth areas
ADU rules and plans →County plans for a feeUnincorporated Kitsap, rural
Outside urban growth areas
ADU rules and plans →Where the county plans work, and who issues the permit
| Area | County pre-approved plans | Permit from |
|---|---|---|
| Bainbridge Island | Free | City of Bainbridge Island |
| Bremerton | Free | City of Bremerton DCD |
| Port Orchard | Free | City of Port Orchard |
| Poulsbo | Free | City of Poulsbo |
| Silverdale | Free | Kitsap County DCD |
| Kingston | Free | Kitsap County DCD |
| Unincorporated Kitsap, urban | Free | Kitsap County DCD |
| Unincorporated Kitsap, rural | For a fee (CUP + $1,000 design fee) | Kitsap County DCD |
Urban or rural: the line that matters most
Inside the cities and the county's urban growth areas, Washington's HB 1337 applies. That means up to two ADUs per qualifying lot, no owner-occupancy requirement, and a size cap no lower than 1,000 square feet. Outside those areas, Kitsap County's rural rules apply: one ADU per lot, a detached ADU no larger than 900 square feet or half the main house, and the owner living on site.
Many addresses near Silverdale, Kingston and Port Orchard sit close to an urban growth boundary. If you're not sure which side your lot is on, send us the parcel number and we'll check it free.
Step 1 · Your property
Can you use the free pre-approved plans?
The plans are free in Bainbridge Island, Bremerton, Port Orchard, Poulsbo and the urban areas of unincorporated Kitsap. Rural lots can use them for a fee. Pick where your lot is.