One-bedroom ADU over a garage
IA smart, space-maximizing detached ADU built above a garage—designed to give you full-size living without sacrificing parking or storage. The main home lives on the second floor with an open kitchen, dining, and family room layout, plus a true bedroom, full bath, and a walk-in closet.
With outdoor space built in—including a balcony and main-level deck—The Horizon is a strong fit for long-term rental income, guest living, or multigenerational use when you want privacy, separation, and a more “home-like” feel.
Pricing
Backyard homes are priced as five packages, from $297,049. See the packages and prices →
2026 proposal prices. Each package price includes construction, the builder’s fee and design & engineering; permits, utility and connection fees, and sales tax are extra. A fixed price for this plan on your lot comes after a site visit and design. Seven to fourteen months from design to move-in.
Key seattle DADU features
- 981 sq ft / 1 Bedroom / 1 Bathroom with a true “full home” feel
- Garage + ADU design that preserves parking/storage while adding livable space
- Second-floor living with an open family room, kitchen, and dining layout
- Walk-in closet (WIC) and a well-sized primary bedroom
- Balcony for extra light, airflow, and outdoor living
- Large main-level deck area—great for entertaining or private outdoor space
- Natural zoning between entry/garage level and living level for privacy
What’s Included in the Seattle DADU plan set?
This plan set provides the core drawings needed to define the layout, exterior design, and overall construction intent so you can move forward with planning, pricing, and permitting.
Typically included:
- Floor plan layout(s) and dimensions
- Exterior elevations
- Core architectural details needed to price and permit the build
Still required for permitting (site-specific):
You’ll still need a site plan, utilities/connection details, and completed permit paperwork based on your jurisdiction’s requirements. We can help identify what’s needed for your lot and coordinate the next steps.
Exclusions
Not in the package price: permit fees, utility and connection fees (sewer, water, power), and sales tax. Site conditions a desk can’t see — slope, soils, tree protection, a long sewer run — can change the price after the site visit. Renderings may show options that aren’t in the standard package; the written scope for your project is what counts.
