How much does an ADU cost to build in Kitsap County?

You can expect a rough estimate of about $200 - $350/sqft to build your ADU. Additional costs in Kitsap County will depend on your specific location.

In just permits and fees, Kitsap County’s own pre-approved ADU program estimates an approximate cost of $4,600 - $7,200 depending on the plan, your location, and additional fees. If you are hoping to build in a rural area, Kitsap requires a Conditional Use Permit, or CUP, plus about $1,000 in design fees. In addition, rural ADUs also present challenges including potential tree removal, drainage, landscaping, well/water work, septic evaluations, and more that can raise the cost significantly.

Waterfront ADUs pose their own unique costs and challenges. For instance, it can range anywhere between $10k - $25k for design/engineer/permit costs depending on where your property falls in the Shoreline Master Program, in addition to the typical ADU cost.

Without considering permits and fees or the specific location of your ADU, one can expect to pay anywhere between $150,000 - $350,000.