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Trusted ADU Contractors in The Greater Seattle Area

The expert craftsmen at United Signature are here to help design and construct the perfect ADU for your property, budget, and intended use.

Get free consultation

Discover the Benefits of ADUs & DADUs

ADUs and DADus offer many benefits, including

Bonus Space

They provide additional square footage versatile enough to be created into an office, home gym, entertainment center, playroom, studio, or anything in between

Additional Rental Income

You can generate extra income by renting out your ADUs or DADU, maximizing the value of your property, and recouping back your investment.

Multigenerational Living

ADUs and DADUs are ideal for accommodating grandparents, extended family who are visiting, or college-aged children. Everyone is able to have their own space and privacy.

Get free consultation

Explore our
customize packages

Econo pkg

Compact

Space-efficient ADUs for singles, couples, or starter rentals.

OFFERINGS

  • Designed For : Singles, young couples, short-term or starter rentals
  • Key Features : Studio or 1 BD / 1 BA; 500–650 sf
  • Material : High-quality siding, wood & energy-efficient windows

$150,000 – $185,000

Explore options
package2

Standard

Mid-size ADUs with a balance of comfort and value — great for guests or a small office + bedroom.

OFFERINGS

  • Designed For : Couples, guests, remote workers
  • Key Features : 1 BD + flex / 1 BA; 650–800 sf
  • Material : Premium siding, energy-efficient windows, optional porch

$175,000 – $225,000

Explore options
package3

Family

Two-bedroom ADUs with full living areas for families, roommates, or extended stays.

OFFERINGS

  • Designed For : Small families, roommates, multi-gen living
  • Key Features : 2 BD / 1–1.5 BA; 800–1,000 sf
  • Material : Durable exterior cladding, double-pane windows, custom cabinets

$215,000 – $285,000

Explore options
package4

Spacious

Large ADUs with open layouts, bonus rooms, or home offices. Perfect for multi-gen living or long-term rentals.

OFFERINGS

  • Larger families, multi-gen living, home office/gym
  • Key Features : 2–3 BD / 1–2 BA; 950–1,200+ sf
  • Material : Premium finishes, vaulted ceilings, optional garage or flex rooms

$280,000 – $365,000+

Explore options
Econo pkg

Compact

Space-efficient ADUs for singles, couples, or starter rentals.

OFFERINGS

  • Designed For : Singles, young couples, short-term or starter rentals
  • Key Features : Studio or 1 BD / 1 BA; 500–650 sf
  • Material : High-quality siding, wood & energy-efficient windows

$150,000 – $185,000

Explore options
package2

Standard

Mid-size ADUs with a balance of comfort and value — great for guests or a small office + bedroom.

OFFERINGS

  • Designed For : Couples, guests, remote workers
  • Key Features : 1 BD + flex / 1 BA; 650–800 sf
  • Material : Premium siding, energy-efficient windows, optional porch

$175,000 – $225,000

Explore options
package3

Family

Two-bedroom ADUs with full living areas for families, roommates, or extended stays.

OFFERINGS

  • Designed For : Small families, roommates, multi-gen living
  • Key Features : 2 BD / 1–1.5 BA; 800–1,000 sf
  • Material : Durable exterior cladding, double-pane windows, custom cabinets

$215,000 – $285,000

Explore options
package4

Spacious

Large ADUs with open layouts, bonus rooms, or home offices. Perfect for multi-gen living or long-term rentals.

OFFERINGS

  • Larger families, multi-gen living, home office/gym
  • Key Features : 2–3 BD / 1–2 BA; 950–1,200+ sf
  • Material : Premium finishes, vaulted ceilings, optional garage or flex rooms

$280,000 – $365,000+

Explore options

See why you should
consider to building an ADU

Affordable financing available – check your eligibility today!

Check eligibility
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What’s Included in our ADU construction services

Get free consultation

Design
Consultation

You’ll work with our expert team of designers and builders to craft custom design plans for your ADU or DADU.

Professional Workmanship

Our ADU construction process is meticulously executed by seasoned professionals to ensure flawless results.

Genuine
Materials

We prioritize both durability and aesthetics by selecting only the finest genuine materials from top vendors and manufacturers.

Project Management

Efficient project management is at the heart of our approach. This allows us to complete your ADU project on time and within budget.

Customer Satisfaction

Your satisfaction is our top priority. We are committed to providing ongoing support throughout every phase of the project.

Permitting and Compliance

We handle all aspects of permitting and regulatory compliance.

Calculate the cost of
your ADU or DADU Instantly!

Curious about the cost of your ADU project? Use our easy-to-navigate cost calculator to get a detailed estimate tailored to your needs.
Calculate cost now

Our past ADU/DADU builds

The Atlas G – 1,213 SF (with garage)

2 or 3 BD / 1 BA

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Heading #3
Project type
Econo
Size
Large ADU (700 sq ft)
No. of rooms
2
No. of baths
2.25
ADU type
Luxury
Notable
Furnished
Location (state)
Alaska

The Atlas – 1,143 SF

2 or 3 BD / 1 BA

Heading #3
Heading #3
Project type
Econo
Size
Large ADU (700 sq ft)
No. of rooms
2
No. of baths
2.25
ADU type
Luxury
Notable
Furnished
Location (state)
Alaska

Cedar Groove G – 800 SF (with garage)

2 or 3 BD / 1 BA

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

Cedar Groove – 800 SF

2 or 3 BD / 1 BA

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

The Ridge G – 994 SF

2 or 3 BD / 1 BA

Heading #3
Heading #3
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

The Ridge – 994 SF

2 or 3 BD / 1 BA

Heading #3
Heading #3
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

The Summit G – 994 SF (with garage)

2 or 3 BD / 1 BA

Heading #3
Heading #3
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

The Summit – 994 SF

2 or 3 BD / 1 BA

Heading #3
Heading #3
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

The Horizon G – 1,160 SF (with garage)

2 or 3 BD / 1 BA

Heading #3
Heading #3
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
Download Project Plans

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.
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Michelle O'Brien

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.
JOhn

John-Patrick

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.
alina

Alina Put

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!
Courtney

Courtney Carroll

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 .
rubin

Tatyana Kozyubenko

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.

Mia

Lauren

Frequently Asked Questions About ADU Construction

How much does it cost to build an ADU?
There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.
There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.
There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.
There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.

There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.

There are many different cost factors when building an ADU, including the size of the build, the plumbing and electrical work needed, and the desired materials and finishes. For a more in-depth cost breakdown and a more accurate quote, please call or message us regarding an ADU construction estimate.

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2025 ADU Guide – What to Know Before You Build

Download PDF guide
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Tell us about your ADU/DADU plans

NOTE: Permitting can take several months — secure your spot now to be ready for 2026 builds.

Our partners

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We are an independent design and build studio. We build, install and manage projects to completion. We offer a complete remodeling service, from Free on-site, no-obligation measuring and consultation to installation.

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You Can Find Us Here

Everett, WA
1010 SE Everett Mall Way
#102 Everett,
WA 98208

Tacoma, WA
2302 A St.
Tacoma, WA 98402

©2025 United Signature

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