ADU Contractors near Black Diamond, WA
Cascadia ADU
901 1st Street, Snohomish, WA 98290
42 miles
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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FTS Excavation
12714 151st Street East, Puyallup, WA 98374
17.5 miles
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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Mallard Brothers Construction
120 State Avenue Northeast, Olympia, WA 98501
45.4 miles
Mallard Brothers Construction builds ADUs & Tiny Homes in Olympia, WA. They offer attached, detached, garage conversions & ADA-accessible units, managing design, permits & construction for property owners seeking rental income or extra living space.
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Homez Remodel
13213 Southeast 278th Street, Kent, WA 98042
7.4 miles
Homez Remodel is a Seattle ADU builder specializing in DADUs, backyard cottages, garage conversions & basement ADUs. With 10+ years experience, they handle permits, design & construction across Seattle, Bellevue, Kirkland & more.
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Evola Builds LLC
Poulsbo, WA 98370
41.5 miles
Evola Builds LLC, led by Michael and Amber Evola, offers residential renovation and construction services including bathroom remodels, ADU work, garage conversions, and structural modifications, collaborating closely with architects and homeowners.
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Microhouse
114 North 42nd Street, Seattle, WA 98103
28.6 miles
Microhouse is a Seattle-based ADU builder specializing in custom detached ADUs (DADUs). They guide homeowners through zoning, design, and construction. Seattle permitted 551 DADUs in 2022, with a 40% increase in 2023. Microhouse offers site assessments and tailored DADU solutions.
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Renovate Builders
4555 39th Avenue Southwest, Seattle, WA 98116
24.2 miles
Wise Choice Construction
11626 Southeast 168th Street, Bellevue, WA 98058
12.4 miles
Wise Choice Construction offers expert home additions & ADU builds in Seattle, WA. From detached ADUs and granny flats to in-law suites, they handle permits, zoning, and seamless integration—boosting property value and livable space.
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JayMarc Homes
7525 Southeast 24th Street, Mercer Island, WA 98040
21.7 miles
An Accessory Dwelling Unit (ADU) is an independent living space on a single-family property. Washington State's HB 1337 boosted ADU construction, easing zoning rules, removing owner-occupancy requirements, and capping impact fees at 50%.
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New Image Construction Management
8305 Dallas Avenue South, Seattle, WA 98108
20.5 miles
New Image Construction Management is a Washington State general contractor and building company based in Seattle, WA. With a primary focus of new home construction and renovation of residential and commercial properties.
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Haas Development & Construction
4001 Aurora Avenue North, Seattle, WA 98103
28.2 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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Huskies Construction
1201 Monster Road Southwest, Renton, WA 98057
15.2 miles
Huskies Construction in Renton specializes in home additions, ADUs, and DADUs. Services include garage conversions, granny flats, in-law suites, backyard cottages, and room additions, helping homeowners expand living space or generate rental income.
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True Built Home
3403 North Proctor Street, Tacoma, WA 98407
22.2 miles
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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Coates Design Architects
900 Winslow Way East, Bainbridge Island, WA 98110
31.5 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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Northwest ADU
1201 Pacific Avenue, Tacoma, WA 98402
20.1 miles
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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Other cities in Washington
What you need to know
ADU Contractors in Black Diamond, WA: Building in a Historic Coal Mining Town
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.
Zoning and Permitting Requirements for ADUs in Black Diamond
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:
- Lot size requirements: Properties must meet minimum lot size thresholds before an ADU can be permitted.
- Setback rules: ADUs must comply with specific front, rear, and side yard setbacks as outlined in the Black Diamond Municipal Code.
- Height restrictions: Detached ADUs are generally subject to height limitations consistent with the surrounding residential zone.
- Owner-occupancy rules: Depending on current local ordinances, owner-occupancy of either the primary or accessory unit may be required.
- Utility connections: Separate water and sewer connections may be required, which can add to overall project costs.
Types of ADUs Built by Contractors in Black Diamond
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:
- Detached ADUs (DADUs): Standalone structures built in the backyard, ideal for Black Diamond's spacious properties.
- Attached ADUs: Units added directly to the existing home, sharing at least one wall with the primary residence.
- Garage Conversions: Transforming an existing garage into a livable ADU space.
- Basement ADUs: Converting an existing basement into a fully permitted dwelling unit.
Why Hire a Local ADU Contractor in Black Diamond?
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.