Cruvers Contracting LLC builds ADUs in Snohomish, WA, tackling rural challenges like septic systems, slopes, and wooded lots. Serving areas including Lake Stevens, Monroe, and Everett with phased planning and durable, site-specific construction.
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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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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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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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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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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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Alfa Framing offers residential construction services including structural framing, siding installation, roofing, and ADU/DADU construction. Serving new builds and additions, they bring decades of experience and a solution-oriented approach.
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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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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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Seattle's trusted DADU & ADU builder offers custom builds, ADU conversions, and prefab cabins. Transparent pricing, expert guidance, and hands-on construction help homeowners add lasting value with backyard cottages and granny flats.
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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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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.
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Elite Team Builders Inc. designs & builds ADUs—detached units, garage conversions & backyard cottages—in Seattle, Portland & Los Angeles. They offer custom design, quality materials & transparent pricing for lasting residential value.
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.