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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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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Northwest ADU is a full-service ADU contractor in Western Washington specializing in detached ADUs, garage conversions, and basement conversions. Serving Pierce, King, and Snohomish Counties, projects range from $180K–$350K+, taking 6–10 months.
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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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LYD Construction is a Seattle-area ADU builder & remodeling contractor with 25 years of experience. Services include kitchen, bathroom, basement renovations, deck building & ADU construction. Financing up to $200,000 available. Based in Bellevue, WA.
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FTS Excavation offers full-service ADU site development in South Puget Sound, Western Washington. Services include grading, utilities, septic systems, foundation excavation & permits. Certified, reliable ADU contractor for backyard homes & accessory dwelling units.
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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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True Built Home builds custom ADUs in Washington & Oregon, offering 14 floor plans from 495–1,199 sq ft, priced from $119,900. Plans include granny flats, in-law suites & backyard cottages with transparent pricing and customizable designs.
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Heartwood Builders is a Seattle ADU contractor specializing in backyard cottages, basement ADUs, and mother-in-law suites. They handle permitting, use sustainable materials, and help homeowners add rental income or family housing.
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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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Volcano Builders is a licensed, family-owned construction company serving Seattle, Bellevue & Monroe, WA. Specializing in kitchen remodels, bathroom renovations, home additions, deck builds, and ADU construction since 2021.
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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.
read moreEdmonds, Washington is a charming waterfront city nestled along the shores of Puget Sound in Snohomish County. Known for its vibrant arts scene, historic downtown, and stunning views of the Olympic Mountains, Edmonds is a highly desirable place to live. As housing demand continues to grow in the greater Seattle metro area, many homeowners in Edmonds are turning to Accessory Dwelling Units (ADUs) as a smart solution for adding living space, generating rental income, or housing family members. Finding experienced ADU contractors in Edmonds, WA is the critical first step toward making that vision a reality.
Before breaking ground, it's essential to understand the local rules that govern ADU construction in Edmonds. The City of Edmonds has specific zoning codes under its Edmonds Community Development Code (ECDC) that regulate ADU development. Key regulations include:
A knowledgeable ADU contractor in Edmonds will be well-versed in these local codes and can help navigate the permitting process through the Edmonds Building Division efficiently.
Choosing the right contractor for your ADU project in Edmonds requires careful consideration. The city's unique geography — including sloped lots, older neighborhoods, and proximity to environmentally sensitive shoreline areas — means that local experience truly matters. Look for contractors who offer:
With Edmonds' strong real estate market and proximity to Seattle, Lynnwood, and the Edmonds-Kingston ferry terminal, an ADU can significantly increase your property's value and rental appeal. Whether you're building a backyard cottage, garage conversion, or basement ADU, working with a qualified Edmonds ADU contractor ensures your project meets all local standards while maximizing your investment in this beautiful Pacific Northwest community.