ADU Builders In Seattle & Surrounding Areas

Affordable ADU construction services in Seattle and nearby areas.

ADU Builders in Seattle & Surrounding Areas

Looking to expand your property with a custom-built ADU (Accessory Dwelling Unit)? USA Home Experts offers trusted ADU design and construction services throughout Seattle and surrounding communities. Whether you’re adding a rental unit, guest house, or in-law suite, we’ll help you from start to finish with honest pricing and professional results.

The Most Trusted and 5-Star Rated ADU Builders In Washington

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Everything You Need to Know About Building an ADU in Seattle

If you’re thinking about building an ADU in Seattle, you’re not alone. With rising housing costs and changing family needs, many homeowners are turning to ADUs as smart, flexible solutions. But what exactly is an ADU, and how does the process work? Here’s a helpful guide that breaks it all down—clear, simple, and written by real local experts.

What Is an ADU?

An ADU, or Accessory Dwelling Unit, is a smaller secondary home built on the same lot as a main house. It can be attached to the home (like a basement or side addition), or completely separate (like a backyard cottage or garage conversion).

ADUs are perfect for:

Rental income
Housing aging parents
Creating space for grown children
Guest accommodations
Home offices or studios

Types of ADUs We Build

At USA Home Experts, we help Seattle-area homeowners build all types of ADUs, including:

Detached ADUs (DADUs) – These are separate from the main home. They’re often built in the backyard and function as full standalone units.
Attached ADUs – These units are connected to the main home, either as a side addition or basement conversion.
Garage Conversions – Turn your garage into a livable space with heating, plumbing, and everything your new tenant needs.
Above-Garage ADUs – Add new living space above an existing or newly built garage.

We’ll help you choose the best option based on your space, budget, and local zoning regulations.

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How Much Does an ADU Cost in Seattle?

Costs can vary depending on the size, type, and complexity of your project. On average, Seattle ADUs range from $150,000 to $350,000+. Detached units usually cost more than attached ones, and garage conversions are often the most budget-friendly.

At USA Home Experts, we offer:

Transparent estimates
Flexible financing options
High-quality materials
Cost-saving design strategies

Permits and Zoning for ADUs in Seattle

Seattle has made it easier to build ADUs with relaxed zoning laws and quicker permit times. However, every project still needs city approval. We handle all of that for you:

Zoning checks
Building permits
Utility connections
Inspections

Our team ensures everything is up to code and fully legal.

Timeline: How Long Does It Take?

Most ADU projects in Seattle take between 3 to 8 months from start to finish. Here’s a rough breakdown:

Design & permits: 1–3 months
Construction: 2–5 months
Final inspections: 1–2 weeks

We work hard to stay on schedule and keep you updated every step of the way.

Why Choose USA Home Experts for Your ADU?

Local Expertise: We know Seattle’s codes, neighborhoods, and city processes better than anyone.
Licensed & Insured: Peace of mind knowing your home is in good hands.
Custom Design: Get an ADU that matches your style, needs, and budget.
One-Stop Service: From permits to final paint, we handle everything.
Excellent Reviews: Our clients trust us, and it shows in our 5-star feedback.

Latest Projects

See Our Work

Customer Recommendations

Hear From Our Clients

"Before moving into our newly purchased home, we entrusted USA Home Experts with painting the entire interior, including the garage. Their team demonstrated exceptional responsiveness, punctuality, and an incredible eye for detail. Working efficiently in our empty house, they delivered impeccable results within our timeframe and budget. The final walkthrough was flawless, with every detail perfectly addressed. Thanks to their use of low VOC paint, we were able to move in quickly without any lingering odors. We highly recommend USA Home Experts for their outstanding service and superior craftsmanship!"

Dane James

Renton, WA

"Last summer, USA Home Experts painted the exterior of my single-family rental property, and I couldn’t be more impressed. Having worked with several painting companies before, this experience truly stood out. Their pricing was competitive, but the quality of service exceeded all expectations. They meticulously handled caulking and repairs, even in tricky spots, and reinforced separated siding planks to create a finish that looked brand new. The entire process—from power washing to painting—was completed in just two days. The team was professional, communicative, and detail-oriented throughout. I give them a 10/10 and will definitely hire them again!"

Jessie Snider

Des Moines, WA

"I hired USA Home Experts to repaint the exterior of my home, and I’m thrilled with the outcome! The team’s communication was top-notch, and their dedication to delivering high-quality work was evident from start to finish. Their attention to detail and focus on customer satisfaction exceeded my expectations. I couldn’t be happier with the transformation they brought to my home. Highly recommended!"

Sam Saunders

Mill Creek, WA

"We had USA Home Experts paint several areas of our home, including accent walls, a large 18-foot wall above the chimney, a theater room, and a few outdoor spots. They provided a detailed quote and completed everything in just three days. The quality of their work was phenomenal! We’ve hired many painters before, but this team is by far the best we’ve worked with. We’ll absolutely call them for any future painting projects. Huge thanks to the entire team for an amazing experience!"

Katie Morris

Covington, WA

ADU Builders In Seattle & Surrounding Areas

ADU Builders in Seattle & Surrounding Areas

The Most Trusted and 5-Star Rated ADU Builders In Washington