All six county plans free
ADUs in Port Orchard, WA
Free pre-approved plans, site plans, permits and construction for ADUs in Port Orchard.
Building an ADU in Port Orchard
All six models are available in Port Orchard at no cost as long as no changes are made. The city publishes a permit cost estimate for the 600 SF model (the Sidney); larger models cost slightly more to permit and smaller ones slightly less.
Applications start through the city's online permitting portal.
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 Port Orchard: FAQ
Can I use the free pre-approved ADU plans in Port Orchard?
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 Port Orchard?
Yes. You need a building permit from City of Port Orchard and a site plan for your lot. Pre-approved plans shorten review of the building itself.
How much does an ADU cost in Port Orchard?
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.