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The Den – 540 SF

Accessible one bedroom ADU

It’s time to add style, value, and flexible, poetic living opportunities right in your backyard. 
Chosen by the City of Seattle for its landmark pre-approved DADU (detached accessory dwelling unit) design program, this small home design is a powerhouse of versatility, eye-catching design and pragmatic simplicity. At 600 sq. ft., this detached one-bedroom ADU incorporates Universal Design throughout and can be built as an accessible home. 

Available with either a more traditional gable roof, or with a modern shed roof, it’s aesthetically flexible enough to work with varied neighborhood styles and architecturally designed for understated awesomeness. 

Key seattle DADU features

  • Two available roof configurations, gable and shed.
  • Stairless entry (optional).
  • Energy-efficient insulation options available.
  • Customizable exterior finishes to match personal style.
  • Open-concept living areas for a spacious feel.
  • Sustainable building materials for eco-friendly construction.
  • Smart home technology integration for modern convenience.
  • Landscaping packages tailored to enhance curb appeal.

What’s Included in the Seattle DADU plan set?

If you’re a resident of Seattle, the Seattle DADU plan set includes almost everything the City requires to get your permit, and you’re on the fast track to building your new backyard home. 
As part of the City of Seattle’s pre-approved DADU program, the Seattle DADU plan set includes engineering and energy calculations specific to Seattle’s Municipal Code.

In order to obtain a permit in Seattle, you will still need a site plan specific to your property as well as the completed permitting paperwork.  Please contact us to discuss completing your plan set for a Seattle permit.

Exclusions

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The Den – 540 SF

Package details

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Project type
Econo
Size
Large ADU (700 sq ft)
No. of rooms
3
No. of baths
3
ADU type
Luxury
Notable
Furnished
Location (state)
Alaska
Structure
From the foundation up, including floor & roof systems, interior/exterior walls, code-required hardware, and all OSB sheathing to meet code. 8’+ wall height with vaulted ceilings in the living/kitchen area.
Small covered entry for weather protection and added charm.
Horizontal fiber-cement lap siding (6″ exposure) with prefinished trim boards.
Low-maintenance TPO membrane on the main roof with composition shingles at accents; ice & water shield installed at eaves and valleys.
Double-pane, Low-E vinyl windows in dark bronze finish; insect screens at operable units
Insulated front door with full weather-stripping and brushed hardware.
Pex water lines, efficient fixtures, hot water recirculation, and a residential fire-sprinkler system per NFPA 13D
High-efficiency heat pump plus whole-house ventilation, tested to Washington State Energy Code standards
200-amp service, recessed LED lighting, and weatherproof exterior outlets.
LED fixtures throughout, modern pendants in kitchen/dining, and code-compliant smoke & CO alarms
Closed-cell spray foam with supplemental blown-in insulation; blower-door tested ≤1.5 ACH @ 50 Pa
Smooth Level-4 drywall, painted in neutral tones.
Flat-panel interior doors with soft-close hinges; clean-lined MDF baseboards and casing.
Shaker cabinetry with quartz tops and subway tile backsplash.
Sleek bath fixtures, full stainless-steel appliance package.
Engineered hardwood in living areas; ceramic tile in bath and laundry.
Low-VOC interior paint; premium weather-resistant exterior finishes.
Built-in shelving in bedrooms, linen, and mechanical spaces.
Driveway, walkways, and landscaping; tree mitigation per City of Kirkland standards

How DADU will look like
Download Project Plans
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Let us help you to choose the best package according to your requirements.

Download PDF guide

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United Signature handled a large and complex kitchen reconstruction and remodel after a leak was discovered in the wall and under the floorboards. They were great communicators and helped me handle insurance and the HOA.
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Exceptional service! I recently had my kitchen renovated by United Signature Design and Build and I couldn’t be happier with the results. From the initial consultation to the final details, everything went so smooth.
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NOTE: Permitting can take several months — secure your spot now to be ready for 2026 builds.

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