ADU Contractors near Sequim, WA
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.
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Cruvers Contracting LLC
1002 Pine Avenue, Snohomish, WA 98290
47.6 miles
Cruvers Contracting LLC builds ADUs in Snohomish, WA, tackling rural challenges like septic systems, slopes, and wooded lots. Serving areas including Lake Stevens, Monroe, and Everett with phased planning and durable, site-specific construction.
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Pelletier Construction Group
1150 North 84th Street, Seattle, WA 98103
43.8 miles
Seattle ADU
509 Olive Way, Seattle, WA 98101
47.5 miles
Seattle ADU is a Seattle-based contractor specializing in accessory dwelling units, including detached ADUs, garage conversions, attached ADUs, and JADUs. They manage design, permitting, and construction for homeowners seeking additional living space.
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Giant Builders Seattle
125 Boren Avenue South, Seattle, WA 98144
48.8 miles
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.
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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.
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Haas Development & Construction
4001 Aurora Avenue North, Seattle, WA 98103
45.1 miles
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.
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Tenhulzen Construction
16900 9th Avenue Southeast, Mill Creek, WA 98012
43.4 miles
Tenhulzen Construction offers ADU and DADU construction services in Washington State, providing pre-approved and custom plans. Options suit various budgets and timelines, with benefits including added property value and flexible living spaces.
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Coates Design Architects
900 Winslow Way East, Bainbridge Island, WA 98110
41.2 miles
Seattle ADUs offer rental income & flexible living. Coates Design Architects guides homeowners through detached, attached, garage & basement conversions. Costs range $200K–$350K+, with 7–11 month timelines. Sustainable design & permit-ready plans included.
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Lakeside ADU & Home Planning
1901 Vernon Road, Lake Stevens, WA 98258
47.9 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.
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Greenpod Design
1531 West Sims Way, Port Townsend, WA 98368
14 miles
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.
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Marksymov Brownstone
12814 Northeast 139th Street, Kirkland, WA 98034
49.2 miles
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.
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Ballard Backyard Cottages
4142 2nd Avenue Northwest, Seattle, WA 98107
44.7 miles
Seattle's trusted DADU & ADU builder offers custom builds, ADU conversions, and prefab cabins. Transparent pricing, expert guidance, and hands-on construction help homeowners add lasting value with backyard cottages and granny flats.
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Neil Kelly Washington
804 North Alberta Street, Seattle, WA 97217
44.9 miles
Neil Kelly Washington offers ADU design and build services in the Northwest, including detached ADUs, garage conversions, and attached units. Their team navigates local permits, balances design with functionality, and helps homeowners add value through custom accessory dwelling units.
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Cast Architecture
115 North 36th Street, Seattle, WA 98103
44.9 miles
Cast Architecture specializes in ADU and backyard cottage design in Seattle since 2009. With 80+ projects, their Cedar Cottage is pre-approved by Seattle & Kirkland. Award-winning designs include Widner Cottage and Lichtenstein Studio. Visit castcottages.com.
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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:
- Lot size requirements: Properties within Sequim city limits typically must meet minimum lot size thresholds before an ADU is permitted.
- ADU size limits: Detached ADUs are generally capped at a maximum square footage, often around 1,000 square feet, though this can vary by zone.
- Owner-occupancy rules: Some zones may require the property owner to occupy either the primary residence or the ADU.
- Setback requirements: ADUs must comply with specific front, rear, and side yard setbacks as defined in Sequim's municipal code.
- Utility connections: Separate water and sewer connections may be required, and Sequim's infrastructure considerations must be factored into project planning.
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:
- Detached ADUs (DADUs): Standalone structures built in backyards, popular among Sequim homeowners with larger lots.
- Attached ADUs: Units connected to the primary home, sharing at least one wall.
- Garage Conversions: Transforming existing garages into livable spaces, a cost-effective option in established neighborhoods.
- Junior ADUs (JADUs): Smaller units created within the existing footprint of the primary residence.
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.