All six county plans free
ADUs in Silverdale, WA
Free pre-approved plans, site plans, permits and construction for ADUs in Silverdale.
Building an ADU in Silverdale
Silverdale isn't a city. It's an urban growth area of unincorporated Kitsap County, so the free pre-approved plans apply and Kitsap County's Department of Community Development issues the permit through its online portal.
| Number | Up to two ADUs per lot, attached or detached, under the county's urban ADU rules. |
|---|---|
| Size | Up to 1,000 square feet, measured by interior dimensions. All six county plans are within that. |
| Parking | A first ADU needs no extra space if the main house meets its parking requirement, on-street parking is available, or the lot is within half a mile of a major transit stop. A second ADU needs one off-street space. |
| Owner occupancy | Not required in urban growth areas. |
| Sewer | Urban ADUs must have urban sewer service. If your house is still on septic, plan for that in the budget. |
| Access | Same entrance as the main house, unless county code allows more than one. |
| Permit fee | The county publishes approximate permit fees for each plan, from about $4,700 for the Lille to about $7,200 for the Kitsap. |
Silverdale's urban area is large, but its edges matter. A lot just outside the boundary falls under the rural rules, so we check your parcel against the county map first.
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 Silverdale: FAQ
Can I use the free pre-approved ADU plans in Silverdale?
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 Silverdale?
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 Silverdale?
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.