Harmony Architecture Studio

1324 Lombard Avenue, Everett, WA 98201 25.6 miles

Brutsky Builds

800 Bellevue Way Northeast, Bellevue, WA 98004 5.8 miles

Brutsky Builds is a licensed ADU contractor in Bellevue offering full-service accessory dwelling unit construction. Services start from $210,000, covering design, permitting, and build completion in ~6 months.

Chapman Projects

4225 335th Place Southeast, Fall City, WA 98024 20.4 miles

20 years in business Eco-Friendly

Chapman Projects offers ADU design and construction in Seattle, Bellevue, and King County. With 20+ years of experience, they provide custom accessory dwelling units, detached ADUs, and backyard cottages using sustainable building practices.

DIGS Construction & ADU Builders

18727 North High Rock Road, Monroe, WA 98272 22.4 miles

Eco-Friendly

DIGS is a trusted ADU builder serving King & Snohomish County, WA. They offer custom ADU/DADU design, permitting, construction, and site development, helping homeowners add rental income, property value, and flexible living space.

Marksymov Brownstone

12814 Northeast 139th Street, Kirkland, WA 98034 10.2 miles

Licensed

Marksymov Brownstone LLC is a licensed Seattle ADU contractor offering basement, garage & attic conversions. They handle design, permits & construction, ensuring code compliance across Seattle, Bellevue & Kirkland.

Homez Remodel

13213 Southeast 278th Street, Kent, WA 98042 20 miles

Licensed 10 years in business Eco-Friendly

Homez Remodel is a Seattle ADU builder specializing in DADUs, backyard cottages, garage conversions & basement ADUs. With 10+ years experience, they handle permits, design & construction across Seattle, Bellevue, Kirkland & more.

Elite Team Builders

701 5th Avenue, Seattle, WA 98104 1.2 miles

Luxury Builds

Elite Team Builders Inc. designs & builds ADUs—detached units, garage conversions & backyard cottages—in Seattle, Portland & Los Angeles. They offer custom design, quality materials & transparent pricing for lasting residential value.

Love Construction

17025 33rd Avenue South, SeaTac, WA 98188 11.9 miles

Eco-Friendly

Love Construction builds ADU & DADU units in Seattle & Puget Sound to Passive House standards. Attached ADUs cost $85K–$280K; DADUs $175K–$550K. Includes permitting, energy modeling & a 5-year warranty.

Raincap Construction

2315 North 65th Street, Seattle, WA 98103 3.8 miles

Raincap Construction, a Seattle-based family-owned contractor, specializes in ADU and DADU construction. They build backyard cottages, in-law suites, and garage conversions, helping homeowners add living space, rental income, and property value.

Lakeside ADU & Home Planning

1901 Vernon Road, Lake Stevens, WA 98258 29.8 miles

Lakeside ADU & Home Planning, based in Lake Stevens, WA, is a full-service ADU builder serving the Puget Sound Region. They specialize in backyard cottages, mother-in-law suites, garage conversions, and new builds, managing design, permitting, and construction.

J Hanby LLC

Edmonds, WA 98020 12.8 miles

J Hanby LLC offers ADU and basement conversion services in the Eastside area. Specializing in detached ADUs, garage conversions, granny flats, and basement renovations, they help homeowners maximize property value and ROI.

Red's Construction & Renovation

Federal Way, WA 98003 21.2 miles

Licensed

Red's Construction & Renovation serves Federal Way & South King County, WA, specializing in ADU construction including detached, attached, garage conversions & basement units. Costs range from $50K–$300K+. Licensed, insured, transparent pricing.

ModernSpace ADU Construction Redmond

17181 Redmond Way, Redmond, WA 98052 10.5 miles

Free Consultation

ModernSpace ADU Construction is a certified ADU builder serving Redmond, offering tailored accessory dwelling unit services. Competitive pricing, no hidden fees, and a satisfaction guarantee make them a trusted local choice.

Exceptional Home Builders Seattle

1525 11th Avenue, Seattle, WA 98122 0.5 miles

Licensed 20 years in business Luxury Builds

Exceptional Home Builders is a Seattle ADU contractor with 20+ years of experience. They offer full-service ADU construction, design-build, permitting, interior design, and renovations for backyard cottages, garage conversions, and basement units.

Alta Group Seattle

500 Southeast Everett Mall Way, Everett, WA 98208 20.4 miles

Other cities in Washington

What you need to know

Seattle's Progressive ADU Policies Make It a Leader in Accessory Dwelling Units

Seattle, Washington has become one of the most ADU-friendly cities in the United States. In 2019, the city passed landmark legislation that significantly relaxed restrictions on Accessory Dwelling Units (ADUs), allowing homeowners to build both an attached ADU and a detached ADU (DADU) on the same property simultaneously. This progressive policy shift has created a booming demand for experienced ADU contractors in Seattle, making it essential to find professionals who understand the city's unique regulatory landscape.

Key Seattle ADU Regulations Your Contractor Must Know

Hiring a knowledgeable Seattle ADU contractor means working with someone who is well-versed in the city's specific building codes and zoning requirements. Seattle's Department of Construction and Inspections (SDCI) oversees all ADU permits, and navigating this process requires expertise. Some critical regulations include:

What to Look for in a Seattle ADU Contractor

Finding the right ADU builder in Seattle is critical to the success of your project. The city's hilly terrain, frequent rainfall, and older housing stock present unique construction challenges. A qualified contractor should have experience working with Seattle's soil conditions, understanding of stormwater management requirements, and familiarity with the city's energy code, which aligns with Washington State's strict energy efficiency standards. Always verify that your contractor holds a valid Washington State contractor's license and carries proper liability insurance.

The ADU Permitting Process in Seattle

The permitting process for ADUs in Seattle can be complex and time-consuming. Working with an experienced Seattle ADU contractor who understands the SDCI's online permitting portal and plan review process can save significant time and money. The typical steps include:

Why Investing in an ADU in Seattle Makes Financial Sense

With Seattle's consistently high rental demand and competitive housing market, building an ADU is a smart financial investment. Seattle ADU contractors report strong interest from homeowners looking to generate rental income, house family members, or increase overall property value. Whether you're considering a backyard cottage, a garage conversion, or a basement ADU, partnering with a skilled and licensed contractor who knows Seattle's building environment is the key to a successful and compliant project.

ADU Contractors near Seattle, WA