Planning an ADU in Massachusetts? Costs range from $250–$500+ per sq ft. State law now allows ADUs by right on single-family lots. Learn about permits, the Stretch Energy Code, and working with a qualified ADU contractor in Greater Boston.
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Auburndale Builders completed an 800 sq ft ADU in Newton, MA—a single-level, universally accessible in-law suite with full kitchen, bathroom, bedroom & living area, built in compliance with local zoning regulations.
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Regulus Construction is a licensed ADU contractor serving MetroWest Massachusetts. They build detached backyard cottages, garage conversions, and in-law suites, managing design, permitting, and construction across 40+ towns.
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MassDwell Solutions builds modular ADUs for homeowners, investors & developers. Models range from 470–892 sqft, starting at $164,500. Factory-built steel frame units include full warranties, energy-efficient features & 8–12 week installation.
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SRH Homes builds custom ADUs, including 500 SF 1-bed and 800 SF 2-bed units. Options include high-end finishes and mini-split HVAC. Financing via HELOC or cash-out refinance. Ideal for rental units, granny flats, or in-law suites.
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An Accessory Dwelling Unit (ADU) is a self-contained living space on a residential property. Massachusetts law now makes ADU construction easier. Aureli Construction offers full-service ADU building, from zoning research to completed construction.
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River City Construction is a Boston-based ADU contractor specializing in home additions, garage conversions, in-law suites & detached backyard cottages. They manage design, permitting & full construction under one roof.
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T&J Builders specializes in custom ADUs in Dover NH, Portsmouth NH, NH Seacoast, Lakes Region & Southern Maine. Services include garage conversions, in-law suites & detached cottages for rental income, multigenerational living & added property value.
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Boston Construct is a full-service ADU contractor in Boston, MA, building basement conversions, garage conversions, detached backyard cottages, and in-law suites. They handle design, permitting, and construction for 1-3 family homeowners across Greater Boston.
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New England Additions, backed by Sordan Construction, offers pre-designed ADU builds across 25+ Greater Boston communities. Specializing in in-law suites and detached ADUs, they streamline permitting, budgets, and timelines for Massachusetts homeowners.
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Meetinghouse Builders offers custom ADU design & construction in Hollis, NH. Services include detached builds, garage conversions, basement ADUs & home additions. Features 3D renderings, style guides & full construction documents.
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Avalon Building Systems builds custom modular homes and ADUs across the northeastern US. A VA Certified Builder, they offer turnkey services, Energy Star-compliant construction, and compact floor plans like in-law suites and backyard cottages.
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Kinstruct Tiny Homes is a Pacific Northwest contractor specializing in tiny homes and ADUs, including detached ADUs, backyard cottages, granny flats, and in-law suites built to maximize space and meet local codes.
read moreSalem, New Hampshire is one of the state's most dynamic communities, situated directly on the Massachusetts border along Route 28 and Interstate 93. Known for its strong retail economy anchored by the Rockingham Park area and a rapidly growing residential population, Salem has seen increasing demand for Accessory Dwelling Units (ADUs). Homeowners in Salem are turning to experienced ADU contractors to maximize their property value and address the region's tight housing market, particularly given the town's appeal to commuters heading into the Greater Boston area.
Before breaking ground, it's essential to understand Salem's local zoning ordinances. Salem operates under its own Zoning Ordinance, and ADUs are generally permitted as accessory uses in residential zones, but subject to specific conditions. Key regulatory points that qualified ADU contractors must navigate include:
New Hampshire state law, particularly RSA 674:71-73, provides a framework encouraging municipalities to allow ADUs, and Salem has aligned its local ordinances accordingly. However, working with a knowledgeable local ADU contractor ensures full compliance with both state and town-specific requirements.
Experienced ADU contractors in Salem, NH offer a variety of construction options tailored to the town's mix of colonial-style homes, ranch properties, and newer developments. Common ADU types include:
Hiring a local ADU contractor in Salem, New Hampshire offers significant advantages. Local professionals are familiar with the town's permitting timelines, building inspectors, and specific soil and frost-depth considerations common to Southern New Hampshire's climate. They also understand the architectural character of Salem neighborhoods, ensuring your ADU blends seamlessly with the existing structure.
With Salem's proximity to Massachusetts and its strong rental demand, a well-built ADU can generate substantial rental income or provide flexible multigenerational living space. ADU contractors in Salem, NH can help homeowners assess feasibility, manage permitting, and deliver high-quality construction that meets all local codes — making your ADU project a smart, long-term investment in one of New Hampshire's most sought-after communities.