Harjo Construction

4900 15th Avenue Northwest, Seattle, WA 98107 43.7 miles

Harjo Construction builds AADUs & DADUs in Seattle with 300+ projects since 2010. Costs range $275K–$650K, max 1,000 sq ft, 4–6 month build time. Seattle removed owner-occupancy rules, boosting ADU rental potential.

Elite Team Builders

701 5th Avenue, Seattle, WA 98104 48.1 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.

Microhouse

114 North 42nd Street, Seattle, WA 98103 44.7 miles

Microhouse is a Seattle-based ADU builder specializing in custom detached ADUs (DADUs). They guide homeowners through zoning, design, and construction. Seattle permitted 551 DADUs in 2022, with a 40% increase in 2023. Microhouse offers site assessments and tailored DADU solutions.

Northwest ADU Builders of Mill Creek

6100 219th Street Southwest, Mountlake Terrace, WA 98043 41.3 miles

Northwest ADU is a trusted ADU builder in Mill Creek, WA, offering full-service accessory dwelling unit construction, including detached ADUs, garage conversions, and basement conversions, with expert permit and zoning support.

Raincap Construction

2315 North 65th Street, Seattle, WA 98103 44.9 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.

Zee Design & Build

570 Kirkland Way, Kirkland, WA 98033 49.8 miles

13 years in business

Zee Design & Build is a Kirkland, WA ADU contractor serving King, Snohomish, Skagit & Island Counties. Offering full-service ADU construction—garage conversions, basement units, backyard cottages & more—since 2012.

Greenpod Design

1531 West Sims Way, Port Townsend, WA 98368 14 miles

10 years in business Prefab Specialist Eco-Friendly

Greenpod Design builds custom DADUs in Washington using SIP construction and sustainable materials. They handle permits, ADA-compliant design, and energy-efficient builds. WA law allows up to two ADUs per lot, up to 1,000 sq ft.

Evola Builds LLC

Poulsbo, WA 98370 31.2 miles

Evola Builds LLC, led by Michael and Amber Evola, offers residential renovation and construction services including bathroom remodels, ADU work, garage conversions, and structural modifications, collaborating closely with architects and homeowners.

Alta Group Seattle

500 Southeast Everett Mall Way, Everett, WA 98208 41.8 miles

Model Remodel

1111 West Nickerson Street, Seattle, WA 98119 44.3 miles

Seattle's 2019 ADU law changes made it easier to build accessory dwelling units on single-family lots. DADUs can't exceed 50% of the main home's size. No parking required. New detached ADUs start around $350,000.

Giant Builders Seattle

125 Boren Avenue South, Seattle, WA 98144 48.8 miles

Licensed 20 years in business

Giant Builders Seattle is a Kent, WA general contractor with 20+ years of experience offering ADU construction, garage conversions, kitchen & bathroom remodeling, room additions, roofing, deck building, and more.

Marksymov Brownstone

12814 Northeast 139th Street, Kirkland, WA 98034 49.2 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.

New Day Construction

15021 116th Place Northeast, Kirkland, WA 98034 48.1 miles

Licensed 21 years in business Eco-Friendly

New Day Construction is a licensed ADU builder in Bellevue, WA, with 21+ years of experience and 250+ projects. They build detached, attached, garage, basement, and custom ADUs, managing permits and design from start to finish.

Haas Development & Construction

4001 Aurora Avenue North, Seattle, WA 98103 45.1 miles

Prefab Specialist

Haas Development & Construction offers ADU & DADU construction in Greater Seattle. They handle planning, permits, design, and builds for attached & detached units, including prefab DADU plans, helping homeowners add rental income or family housing.

United Signature

1010 Southeast Everett Mall Way, Everett, WA 98208 42.3 miles

Seattle-based United Signature specializes in ADU & DADU construction. They offer custom design, permitting, and project management. Benefits include rental income, multi-generational living & versatile spaces. Financing available via Enhancify.

Other cities in Washington

What you need to know

Building ADUs in Sequim's Unique "Blue Hole" Climate

Sequim, Washington is famously known as the "Blue Hole" of the Olympic Peninsula, receiving only about 16 inches of rainfall per year — far less than the surrounding region. This unique microclimate makes Sequim an exceptionally desirable place to live, driving strong demand for Accessory Dwelling Units (ADUs). Whether you're looking to house aging parents, generate rental income, or add long-term property value, working with experienced ADU contractors in Sequim, WA is essential to navigating local building requirements and making the most of this sunny Pacific Northwest gem.

Sequim ADU Regulations and Zoning Requirements

Before breaking ground, homeowners must understand that ADU construction in Sequim is governed by both the City of Sequim and Clallam County regulations, depending on whether the property falls within city limits or the surrounding unincorporated areas. Key rules to be aware of include:

Types of ADUs Built by Sequim Contractors

Skilled ADU contractors in Sequim are experienced in building a variety of unit types to suit different property layouts and homeowner goals. Common ADU types in the area include:

Why Hire a Local Sequim ADU Contractor?

Hiring a local ADU contractor in Sequim, WA offers significant advantages. Local professionals understand the specific permitting process through the Sequim Community Development Department, are familiar with Clallam County building codes, and have established relationships with local inspectors. They also understand regional construction considerations such as seismic zone requirements and building for the mild but occasionally wet Pacific Northwest winters.

With Sequim's growing retirement community and increasing housing demand, ADU construction represents a smart investment. Connect with a qualified Sequim ADU contractor today to begin your project with confidence.

ADU Contractors near Sequim, WA