Skagit Design Homes offers flexible ADU plans for detached units, backyard cottages & granny flats. Maximum ADU sizes vary by local zoning laws. Check municipal regulations early to ensure your accessory dwelling unit project stays on track.
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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.
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Olympic View Building is an ADU contractor offering detached ADU construction, garage conversions, in-law suites, granny flats, and JADU services. They help homeowners add value and living space while navigating zoning laws and building codes.
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NW Build specializes in ADU & DADU construction in Bellevue and the Puget Sound region. They manage permits, design, and builds for detached ADUs, attached units, and granny flats, adding value to residential properties.
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Seattle Backyard Homes builds expert ADUs, DADUs, garage conversions & backyard cottages in Seattle and Bellevue. Full-service ADU contractors handling design, permits, zoning & construction with quality craftsmanship and transparent pricing.
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Cascadia ADU builds attached, detached, garage & basement ADUs across King, Snohomish, Skagit & Chelan Counties, WA. Full-service design, permitting & construction completed in 8–10 weeks with 10+ years experience.
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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.
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Backyard ADU is a full-service ADU contractor managing every stage of accessory dwelling unit builds, including feasibility, permits, site surveys, foundations, construction, utility connections, and condo legal services.
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NorthLight Custom Builders offers ADU construction in King & Snohomish County. Services include attached & detached units for rental income, family living, or home offices. Structured process from consultation to one-year warranty follow-up.
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At Puget Sound ADU Builders, we create functional and cozy and ADUs (Accessory Dwelling Units) in Washington. Our company was founded by Tanya Mills and built on a passion for providing high-quality, affordable housing solutions that unite families. With rising costs in traditional housing and care, we offer practical alternatives that allow your loved ones to live independently in comfortable spaces—right in your backyard.
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Cornerstone Builders LLC is a Sequim-based ADU builder serving Washington's North Olympic Peninsula for 40+ years. This certified design-build firm manages all phases—design, permitting, and construction—offering transparent, process-driven ADU solutions.
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Greater Seattle Remodeling builds code-compliant ADUs across the Seattle metro, including detached ADUs, garage conversions, and basement apartments. They match homeowners with vetted contractors for permits, design, and construction.
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ADU Builders Seattle (Maksymov Brownstone LLC) specializes in detached ADU construction across Seattle & King County. Licensed & bonded, they handle zoning, permits, and SDCI approvals. Services include backyard cottages, two-story units, garage conversions & rental-ready DADUs.
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Carriage Houses NW is a Pacific Northwest ADU builder specializing in infill housing. They develop ADUs, duplexes, and townhomes, partner with homeowners, and offer fee-to-build services, leveraging WA State HB 1110 and HB 1337 legislation.
read morePort Townsend, Washington, is one of the best-preserved Victorian seaports in the United States, and its rich architectural heritage creates a unique environment for ADU contractors in Port Townsend. The city's historic districts, including the National Historic Landmark designation for much of its downtown and residential areas, mean that building an Accessory Dwelling Unit here requires careful attention to design standards and local guidelines. Experienced ADU contractors understand how to balance modern living needs with the preservation requirements that make Port Townsend so distinctive.
Port Townsend follows Jefferson County and City of Port Townsend zoning codes that govern ADU construction. ADU contractors in Port Townsend, WA must navigate specific rules, including:
Working with a knowledgeable ADU contractor in Port Townsend ensures that all permits are properly filed with the City of Port Townsend's Development Services Department and that your project meets both state and local building codes.
Given the character of Port Townsend's neighborhoods, skilled ADU contractors commonly build several types of accessory dwelling units to suit the city's unique housing stock:
Hiring a local ADU contractor in Port Townsend, Washington offers significant advantages. Local contractors are familiar with the city's permitting timelines, its historic preservation review process, and the specific challenges posed by the region's coastal climate, including moisture management and wind resistance. Port Townsend's relatively small lot sizes and older infrastructure also require contractors with hands-on experience navigating tight spaces and aging utility systems.
Whether you are looking to create rental income, house a family member, or increase your property value, an ADU in Port Townsend is a smart investment. Connect with a qualified, licensed ADU contractor today to explore your options and begin the planning process in this beautiful Pacific Northwest coastal community.