One-level, two-bedroom detached ADU
A warm, classic cottage-style detached ADU with a surprisingly livable layout. At 785 sq ft, this plan gives you a true “small home” feel—featuring an open living/kitchen great room, two bedrooms, and a full bath, all organized for comfort and privacy.
It’s a strong fit for long-term rental income, multigenerational living, or homeowners who want a backyard home that doesn’t feel like a studio.
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
- 785 sq ft / 2 Bedrooms / 1 Bathroom — ideal for roommates, small families, or a higher-quality rental
- Open living + kitchen great room with space for a dining table and full seating area
- Two true bedrooms placed on opposite sides for better privacy and flexibility
- Full bath with tub/shower (practical for long-term living)
- Efficient, no-wasted-space layout that feels bigger than the square footage
- Timeless “cottage” character that pairs well with traditional homes while still looking clean and updated
What’s Included in the Seattle DADU plan set?
This plan set provides the core drawings needed to define the layout and exterior design so you can move forward with pricing, planning, and permitting.
Typically included:
- Floor plan layout 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 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.
