Rendering: Kitsap pre-approved ADU program (Artisans Group)
The Lille
Compact one-bedroom cottage for smaller rear and side yards.
| Size | 480 SF |
|---|---|
| Bedrooms | 1 |
| Bathrooms | 1 |
| Stories | 1 |
| Footprint | about 20' × 24' (approximate) |
| Best for | 1–2 people |
| Plan cost | Free in eligible urban areas |
| County permit fee | about $4,666 (unincorporated) |
| Build estimate | $156,000–$264,000, building only |
| Works in | Bainbridge, Bremerton, Port Orchard, Poulsbo, Silverdale, Kingston and other urban areas; rural lots for a fee |
| Source | Kitsap pre-approved program · Artisans Group |
About The Lille
The Lille is the smallest of Kitsap's six pre-approved plans: a 480 square-foot, one-bedroom, single-story cottage.
Its small footprint makes it the easiest plan to fit behind an existing house, and the lowest-cost county plan to build.
A good fit for
- Tighter lots where a larger plan won't clear setbacks
- A first rental unit with the lowest build cost
- A parent, adult child or caregiver who wants their own front door
What you still need
- A site plan for your lot showing setbacks, utilities and drainage
- A building permit from your city or Kitsap County
- Septic approval from Kitsap Public Health if you are not on sewer
Building in a specific town? See Poulsbo, Bremerton, Bainbridge Island, Port Orchard, Silverdale or Kingston, or read the ADU FAQ.
Step 3 · Site plan
Will it fit on your lot?
Enter your lot and house, then drag the ADU into place. This is a quick test fit. Our site plan adds survey or County GIS lines, utilities, driveway, parking, drainage and critical areas, drawn to your jurisdiction's checklist.
Budget
What would The Lille cost to build?
Ballpark the building
Our builds usually run $325 to $550 per square foot, depending on finishes. That covers the building. Site work, utility connections and septic depend on your lot, so we price them after a site visit.
Building estimate range
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An estimate range, not a bid. Permit fees shown are Kitsap County's published approximations for unincorporated Kitsap; city fees differ. Your fixed price comes from a site visit and a line-item estimate.
Questions
The Lille FAQ
Is the Lille plan free?
Yes. The Lille is a Kitsap pre-approved plan, free to use without structural changes in Bainbridge Island, Bremerton, Port Orchard, Poulsbo and urban unincorporated Kitsap. Permit fees and a site plan are still required.
Can I build The Lille on a rural lot?
Yes, for a fee. Kitsap County says rural-zoned lots can use the pre-approved plans with a Conditional Use Permit, its fees, and a $1,000 design fee. Rural detached ADUs are also limited to 900 square feet or half the main house, whichever is smaller.
Can I change The Lille?
Only non-structural choices: window colors, sill heights and operation, roof pitch, style and materials, eaves, siding, doors, lighting and most interior walls. Structural changes take it out of the pre-approved path and into full review.
What does it cost to build The Lille?
Our builds usually run $325 to $550 per square foot for the building, which for The Lille is about $156,000 to $264,000. Site work, utilities and septic are extra and depend on your lot. Kitsap County puts the permit fee at about $4,666 in unincorporated Kitsap.