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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ModernSpace ADU Construction is a certified ADU builder serving Redmond, offering tailored accessory dwelling unit services. Competitive pricing, no hidden fees, and a satisfaction guarantee make them a trusted local choice.
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Love Construction builds ADU & DADU units in Seattle & Puget Sound to Passive House standards. Attached ADUs cost $85K–$280K; DADUs $175K–$550K. Includes permitting, energy modeling & a 5-year warranty.
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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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DIGS is a trusted ADU builder serving King & Snohomish County, WA. They offer custom ADU/DADU design, permitting, construction, and site development, helping homeowners add rental income, property value, and flexible living space.
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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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J Hanby LLC offers ADU and basement conversion services in the Eastside area. Specializing in detached ADUs, garage conversions, granny flats, and basement renovations, they help homeowners maximize property value and ROI.
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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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SkyDADU is a DADU builder and equity partner serving King, Snohomish, and Pierce counties in Washington State. They offer fixed-price packages, up to 100% funding, and handle permitting, construction, and condominiumization for detached accessory dwelling units.
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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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Gravity Builders LLC is a licensed ADU contractor and custom home builder in Renton, WA. Specializing in ADU/DADU construction, custom homes, outdoor living spaces, and concrete work, they deliver quality craftsmanship with transparency and integrity.
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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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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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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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Black Diamond, Washington, is a small but historically rich city in King County, known for its coal mining heritage dating back to the 1880s. With a population of just over 4,000 residents and a semi-rural character, Black Diamond has seen growing interest in Accessory Dwelling Units (ADUs) as homeowners look to add housing options on their properties. Working with experienced ADU contractors in Black Diamond, WA is essential, as the city's unique zoning landscape and King County regulations create a specific set of requirements that must be carefully navigated.
Black Diamond operates under its own municipal code while also aligning with broader King County ADU regulations. Homeowners planning to build an ADU must obtain proper building permits through the City of Black Diamond's Community Development Department. Key considerations include:
Skilled ADU contractors serving Black Diamond, Washington are experienced in constructing several types of accessory dwelling units suited to the area's larger residential lots and semi-rural setting:
Hiring a local ADU contractor familiar with Black Diamond ensures your project moves forward efficiently. Local contractors understand the city's permitting timelines, inspection processes, and the specific challenges of building in a historically designated area. They can also help homeowners take advantage of Washington State's ADU-friendly legislation, including laws that have reduced barriers to ADU construction statewide.
Whether you're looking to create rental income, house extended family, or increase your property value, partnering with a qualified ADU contractor in Black Diamond, WA is the smartest first step. Always verify that your contractor is licensed, bonded, and insured in the state of Washington before beginning any project.