Accessible one bedroom ADU
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.
Estimated Pricing
- Basic Build (no upgrades): ~$253,000
- As-Built With Upgrades: ~$391,000
- Suggested Selling Price: ~$450,000 – $470,000
Pricing varies based on site conditions, access, utilities, permitting requirements, and finish selections. Final pricing is confirmed after a site review and scope is defined.
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
Under United Signature / Signature Build, site preparation, utilities, foundation work, and any required drainage, hardscape, fire suppression, or flame-retardant systems are not included in the base package price. These items, along with applicable sales tax, will be evaluated and itemized separately in your detailed cost breakdown after our team reviews the specific conditions and requirements of your property. Any visual renderings or illustrations may show optional features or upgrades that are not part of the standard package offering. For complete and accurate information on what is included, please refer to the written specifications and scope of work provided for your project.
