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.
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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 design... read more
Walt Kane Construction, a Fall City, WA-based ADU contractor, builds custom accessory dwelling units including guest houses, rental units, in-law suites, and detached ADUs, focusing on durable materials, efficient layouts, and craftsmanship tailor... read more
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 Enha... read more
H26 Builders is a Seattle ADU contractor offering attached ADUs, detached ADUs, and garage conversions. Services include design consultation, permitting support, and project management to help homeowners add functional living or rental space.
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Emerald ADU Builders Seattle specializes in ADU design, permitting, and construction. They build detached ADUs, attached ADUs, and garage conversions, serving Seattle homeowners with quality craftsmanship and transparent pricing.
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An ADU (accessory dwelling unit) is a secondary dwelling on a single-family lot. Types include basement apartments, garage conversions & detached cottages. Costs vary by size, design, permits & materials. Professional ADU contractors ensur... read more
RT Signature Homes, a Redmond, WA-based ADU contractor and design-build firm, builds detached and attached ADUs, garage conversions, and in-law suites, managing feasibility review, permitting, and construction for functional residential living spa... read more
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.
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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 & per... read more
Puget Sound ADU Builders is a leader in ADU construction in western Washington state, excelling in design, construction, finishing, and permitting ADUs, DADUs, backyard cabins, garage conversions, duplexes, town homes, and multi-unit projects.
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Drew Thatcher Construction builds ADUs in Lakewood, WA, including detached units, attached ADUs, and garage conversions. Founded by a Navy nuclear engineer, they offer design-build services with local Pierce County expertise.
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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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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.
read moreBothell, Washington has experienced remarkable population growth over the past decade, largely driven by its proximity to major tech employers in the greater Seattle-Eastside corridor. This growth has created significant demand for additional housing, making Accessory Dwelling Units (ADUs) an increasingly popular solution for homeowners. Whether you're looking to house extended family, generate rental income, or increase your property value, working with experienced ADU contractors in Bothell, WA is essential to navigating the local building landscape successfully.
Bothell operates under its own municipal code, and portions of the city fall under both Snohomish County and King County jurisdictions, which can add complexity to the permitting process. Homeowners and contractors must carefully determine which jurisdiction governs their specific parcel before beginning any ADU project. The City of Bothell generally allows ADUs in single-family residential zones, but there are important rules to follow:
Choosing the right ADU contractor in Bothell means finding a professional who understands local zoning codes, has experience pulling permits through the City of Bothell's Community Development Department, and can manage the full scope of construction from design to final inspection. The best contractors will offer:
Given Bothell's strong real estate market and high rental demand — fueled by workers at nearby companies and students attending University of Washington Bothell — an ADU can deliver exceptional return on investment. Rental rates in the area remain competitive, and a well-built ADU can significantly increase your property's overall market value.
Working with a licensed, insured, and locally experienced ADU contractor in Bothell, Washington ensures your project meets all code requirements, stays on budget, and is completed efficiently. Start by consulting with a contractor who specializes in ADU construction and has a deep understanding of Bothell's unique regulatory environment.