All six county plans free
ADUs in Unincorporated Kitsap County (UGAs)
Free pre-approved plans, site plans, permits and construction for ADUs in urban Kitsap County.
Urban unincorporated Kitsap
Outside the cities, Kitsap County permits ADUs through its Department of Community Development. The free plans can be used in the county's urban growth areas, including Silverdale, Kingston and Central Kitsap.
| Number | Up to two ADUs per lot, attached or detached. |
|---|---|
| Size | Up to 1,000 square feet, by interior dimensions. |
| Parking | A first ADU often needs no extra space; a second needs one off-street space. |
| Owner occupancy | Not required. |
| Sewer | Urban sewer service is required. |
Not sure whether your parcel is inside an urban growth area? Send us the parcel number and we'll check it.
State rules that apply
Washington's HB 1337 sets minimums inside urban growth areas: at least two ADUs per qualifying lot, no owner-occupancy requirement, a size cap no lower than 1,000 square feet, and impact fees no more than half of the main house's. Read the HB 1337 guide →
What it costs
For the building, our ADU builds usually run $325 to $550 per square foot depending on finishes. Site work, utility connections and septic are extra. See the cost guide or our packages.
Next steps
Start with a free parcel check. We confirm zoning, the urban growth boundary, sewer or septic and critical areas, then quote the site plan and permit. Questions first? Read the ADU FAQ or call 206.226.1988.
Step 2 · Choose a plan
Plans you can build here
The county's pre-approved plans cost nothing to use in eligible areas. You can pick finishes, colors and roof style, but not structural changes. Need a different layout? Ask us about licensed plans from other architects.
Tick “Compare” on up to three plans to see them side by side. Kitsap and Salish footprints come from the architect's cut sheets; the others are approximate. Renderings: Kitsap pre-approved ADU program (Artisans Group).
Questions
ADUs in urban Kitsap County: FAQ
Can I use the free pre-approved ADU plans in urban Kitsap County?
Yes. All six Kitsap pre-approved plans can be used for free here when built without structural changes.
Do I still need a permit for an ADU in urban Kitsap County?
Yes. You need a building permit from Kitsap County DCD and a site plan for your lot. Pre-approved plans shorten review of the building itself.
How much does an ADU cost in urban Kitsap County?
Our builds usually run $325 to $550 per square foot for the building, depending on finishes. Site work, utilities and septic are extra and depend on the lot; we price them after a site visit.
Who can draw my site plan and build the ADU?
Kitsap ADU prepares the site plan and permit package through Laughlin Development and builds through JKM Construction, a licensed Washington general contractor since 2019.