2026 ADU/DADU Calendar Now Open — Design-first, white-glove build management.

The Atlas G – 1,213 sq ft

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.

Estimated Pricing

Basic Build: ~$312,000
As-Built With Upgrades: ~$483,000
Turnkey Estimate: ~$329,000 – $354,000
Suggested Selling Price: ~$556,000 – $581,000

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 Atlas G – 1,213 sq ft

Package details

Heading #3	Heading #3
Project type	Spacious
Size	Large ADU (1,213 sq ft)
No. of rooms	2
No. of baths	2.25 BA
ADU type	Luxury
Notable	Furnished
Location (state)	Washington

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.

Front Porch

Small covered entry for weather protection and added charm.

Siding & Trim

Horizontal fiber-cement lap siding (6″ exposure) with prefinished trim boards.

Roofing

Low-maintenance TPO membrane on the main roof with composition shingles at accents; ice & water shield installed at eaves and valleys.

Windows

Double-pane, Low-E vinyl windows in dark bronze finish; insect screens at operable units

Exterior Door

Insulated front door with full weather-stripping and brushed hardware.

Plumbing

Pex water lines, efficient fixtures, hot water recirculation, and a residential fire-sprinkler system per NFPA 13D

HVAC

High-efficiency heat pump plus whole-house ventilation, tested to Washington State Energy Code standards

Electrical

200-amp service, recessed LED lighting, and weatherproof exterior outlets.

Lighting

LED fixtures throughout, modern pendants in kitchen/dining, and code-compliant smoke & CO alarms

Insulation

Closed-cell spray foam with supplemental blown-in insulation; blower-door tested ≤1.5 ACH @ 50 Pa

Drywall

Smooth Level-4 drywall, painted in neutral tones.

Interior Millwork & Doors

Flat-panel interior doors with soft-close hinges; clean-lined MDF baseboards and casing.

Cabinetry, Countertops & Vertical Tilework

Shaker cabinetry with quartz tops and subway tile backsplash.

Bath Accessories & Kitchen Appliances

Sleek bath fixtures, full stainless-steel appliance package.

Floor Coverings

Engineered hardwood in living areas; ceramic tile in bath and laundry.

Paint

Low-VOC interior paint; premium weather-resistant exterior finishes.

Closets

Built-in shelving in bedrooms, linen, and mechanical spaces.

Final Earthwork & Clean Up

Driveway, walkways, and landscaping; tree mitigation per City of Kirkland standards

How DADU will look like

Heading #3	Heading #3
Project type	Family
Size	Spacious 1,216 sq ft
No. of rooms	2
No. of baths	2.25 BA
ADU type	Modern/Luxury
Notable	Modern Build
Location (state)	Seattle, WA

Heading #3	Heading #3
Project type	Family
Size	Spacious ADU (1,143 sq ft)
No. of rooms	2
No. of baths	2.25 BA
ADU type	Modern
Notable	Furnished
Location (state)	Washington

Heading #3	Heading #3
Project type	Family
Size	Standard ADU (800 sq ft)
No. of rooms	2
No. of baths	1 BA
ADU type	Modern
Notable	Furnished
Location (state)	Washington

Heading #3	Heading #3
Project type	Family
Size	Large ADU (700 sq ft)
No. of rooms	2
No. of baths	1 BA
ADU type	Luxury
Notable	Furnished
Location (state)	Washington

Heading #3	Heading #3
Project type	Family
Size	Large ADU (994 sq ft)
No. of rooms	2
No. of baths	0.75 BA + 2 Car Garage
ADU type	Contemporary
Notable	Furnished
Location (state)	Washington

Heading #3	Heading #3
Project type	Family
Size	Large ADU (700 sq ft)
No. of rooms	2
No. of baths	0.75 BA
ADU type	Luxury
Notable	Furnished
Location (state)	Washington

What people say about us

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.

We had a bathroom and kitchen remodel done by Oleg (senior project manager), Natasha (lead designer) and Sergei (project manager). Excellent, high quality work. Always available and professional.

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.

Oleg, Anna, and their team made all of our kitchen dreams come true! This review is long overdue but they were the absolute best team to work with. We will absolutely be using their services again when we decide to renovate our master bathroom!

It was a pleasure to work with United Signatu. Company perform best quality of services and products. Friendly approach, time efficiency. If you are looking for a project well done I strongly recommend United Signature .

Awesome kitchen remodeler company. Got the job done quick and on time. Will definitely use them again when I have remodel needs. I recommend to everyone looking for a good kitchen remodeler. Also shoutout to Nina for doing a great job with her work.

Spacious

The Atlas G – 1,213 sq ft

Accessible one bedroom ADU

Estimated Pricing

Key seattle DADU features

What’s Included in the Seattle DADU plan set?

Exclusions

The Atlas G – 1,213 sq ft

Package details

How DADU will look like

Let us help you to choose the best package according to your requirements.

You may also like to explore

Signature Modern – 1,216 sq ft

The Atlas – 1,143 sq ft.

Cedar Groove – 800 SF (with garage)

Cedar Groove – 800 SF

The Ridge G – 994 sq ft.

The Summit – 994 sq ft.

What people say about us

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