Levite Construction Co is a Seattle-based family-owned general contractor offering kitchen remodeling, bathroom remodeling, ADU construction, garage conversions, new builds, interior design, and more across the Greater Seattle area.
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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... read more
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 ... read more
Bicknell Builds offers ADU construction in the greater Seattle area, including detached ADUs, backyard cottages, granny flats, and in-law suites. Ideal for rental income, family housing, or added property value.
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BB Builders Pro specializes in ADU construction, garage conversions, home additions, and detached backyard cottages. Services include custom design, permitting, zoning compliance, and renovations—ideal for rental income or family housing.
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Harjo Construction builds AADUs & DADUs in Seattle with 300+ projects since 2010. Costs range $275K–$650K, max 1,000 sq ft, 4–6 month build time. Seattle removed owner-occupancy rules, boosting ADU rental potential.
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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 Be... read more
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 integr... read more
Zee Design & Build is a Kirkland, WA ADU contractor serving King, Snohomish, Skagit & Island Counties. Offering full-service ADU construction—garage conversions, basement units, backyard cottages & more—since 2012.
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Backyard ADU is a full-service ADU contractor managing every stage of accessory dwelling unit builds, including feasibility, permits, site surveys, foundations, construction, utility connections, and condo legal services.
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Cast Architecture specializes in ADU and backyard cottage design in Seattle since 2009. With 80+ projects, their Cedar Cottage is pre-approved by Seattle & Kirkland. Award-winning designs include Widner Cottage and Lichtenstein Studio. Visit c... read more
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 assess... read more
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
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 sp... read more
SeaTac, Washington is a unique city shaped largely by its proximity to Seattle-Tacoma International Airport. This means that ADU contractors working in SeaTac must navigate not only standard King County and city zoning regulations, but also Federal Aviation Administration (FAA) height restrictions and noise compatibility guidelines. These aviation-related constraints can directly impact the design and construction of Accessory Dwelling Units, making it essential to hire an experienced ADU contractor who understands the local landscape.
SeaTac operates under its own municipal code, separate from unincorporated King County. Homeowners looking to build an ADU in SeaTac must comply with the SeaTac Municipal Code Title 15, which governs land use and zoning. Key considerations include:
One of the most distinctive challenges for ADU contractors in SeaTac is addressing aircraft noise. The city falls within the Airport Influence Area, and many properties are subject to significant noise levels measured in Day-Night Average Sound Levels (DNL). Contractors must often incorporate sound attenuation measures such as enhanced insulation, double-pane or triple-pane windows, and specialized ventilation systems to meet habitability standards. Some properties may even qualify for the Port of Seattle's Residential Sound Insulation Program, which can offset certain construction costs.
Working with an ADU contractor who has direct experience in SeaTac provides significant advantages. A knowledgeable local contractor will be familiar with:
Despite its unique regulatory environment, SeaTac presents a strong opportunity for ADU development. The city's location along the Link Light Rail corridor and its proximity to major employment hubs make rental ADUs highly attractive. With Washington State's ADU-friendly legislation continuing to evolve, now is an excellent time to consult with a qualified SeaTac ADU contractor to explore your options, maximize your property's potential, and ensure full compliance with all local, state, and federal requirements.