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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Giant Builders Seattle is a Kent, WA general contractor with 20+ years of experience offering ADU construction, garage conversions, kitchen & bathroom remodeling, room additions, roofing, deck building, and more.
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Twin Brothers Group is a licensed framing contractor in Washington State specializing in ADU, DADU, garage conversions, and home additions across King and Snohomish County, serving Seattle-area GCs and owner-builders.
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Armada Design & Build Inc., Bellevue, WA, offers full-service residential design-build since 2011. Specializing in remodels, home additions, and custom builds across Puget Sound, they deliver turnkey solutions with in-house design and quality craftsmanship.
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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.
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Red's Construction & Renovation serves Federal Way & South King County, WA, specializing in ADU construction including detached, attached, garage conversions & basement units. Costs range from $50K–$300K+. Licensed, insured, transparent pricing.
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Deane Home Services builds ADUs in South King County, WA, including garage conversions, basement remodels, and detached backyard cottages. Licensed, bonded & insured. Serving Kent, Renton, Federal Way & more.
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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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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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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 ensure smooth project execution.
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Brutsky Builds is a licensed ADU contractor in Bellevue offering full-service accessory dwelling unit construction. Services start from $210,000, covering design, permitting, and build completion in ~6 months.
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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 & permit-ready plans included.
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NW Finishing is a Seattle-area ADU contractor offering full-service accessory dwelling unit design and construction. Serving Bellevue, Kirkland, Redmond, Renton, and more, they handle permits, planning, and builds for detached, cottage, and prefab ADUs.
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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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Avio Homes is a Seattle-based ADU contractor specializing in detached ADUs, backyard cottages, and in-law suites. Serving Seattle, Tacoma, and Olympia, they handle design, permitting, and construction with local zoning expertise.
read moreShoreline, Washington is one of the Puget Sound region's most progressive cities when it comes to housing density and accessory dwelling units. Located just north of Seattle along the I-5 corridor, Shoreline has actively embraced ADU development as part of its broader strategy to increase housing availability near its two future light rail stations — Shoreline South/148th and Shoreline North/185th — both part of Sound Transit's Lynnwood Link Extension. This transit-oriented growth mindset makes working with experienced ADU contractors in Shoreline, WA more important than ever for homeowners looking to add value and rental income to their properties.
Before breaking ground, homeowners and ADU builders in Shoreline must navigate the city's specific zoning and permitting requirements. Shoreline allows both attached ADUs (AADUs) and detached ADUs (DADUs) in most single-family residential zones. Key regulations include:
Permits are issued through the City of Shoreline's Development Services department, and experienced local ADU contractors will be familiar with the city's online permitting portal and inspection processes, helping to avoid costly delays.
Hiring a local ADU contractor in Shoreline, Washington offers significant advantages over working with a general contractor unfamiliar with the area. Local professionals understand the city's specific soil conditions, stormwater management requirements, and the nuances of building near protected critical areas — which are present in parts of Shoreline due to its proximity to Puget Sound and various wetlands. A knowledgeable contractor will also be up to date on any recent amendments to Shoreline's Municipal Code that affect ADU construction.
A full ADU construction project in Shoreline typically involves site evaluation, architectural design, permit application, foundation work, framing, electrical, plumbing, insulation, and finishing. Costs can vary widely based on unit size and complexity, but homeowners should generally budget between $150,000 and $300,000 for a detached ADU in the greater Seattle metro area. The investment often pays off through rental income, especially given Shoreline's strong rental demand driven by proximity to Seattle and future light rail access.