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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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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Boston ADUs add rental income ($1,500–$3,000/month), boost property value, and support multi-generational living. Boston ADU Builder offers detached, attached, garage, and basement conversions, handling design, permits, and construction in 8–12 months.
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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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Studio Luz Architects designed a 1,180 sq ft attached ADU featuring solar power, wind energy, energy recovery systems, and water collection. The sustainable addition boosted property value while serving as a functional secondary living space.
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Think ADU is a California ADU contractor specializing in design, permitting, and construction of accessory dwelling units. Services include detached ADUs, garage conversions, JADUs, granny flats, and in-law suites for rental, family, or property value goals.
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Core Remodeling Services has built ADUs and in-law suites across Central Massachusetts since 2012. They handle zoning, permits, design, and construction. Projects range from $150K–$400K+, take 6–8 months, and are backed by a 5-year warranty.
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Allan Tran's Exterior Finish Work (AJT Properties) specializes in residential exterior services including deck construction, porch railing installation, storage structures, and CertainTeed siding. Known for reliable communication, on-budget delivery, and durable craftsmanship.
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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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Salisbury Construction Worcester builds ADUs across Worcester County, Central Mass & MetroWest. Services include detached units, garage conversions, basement conversions & home additions using a streamlined design-build process.
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Brittivia Homes & Construction offers expert ADU construction in Middlesex, Worcester & Essex counties, MA. With 20+ years experience, they handle permits, garage conversions & in-law suites. Costs range $150–$300/sq ft.
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ADUs are self-contained living spaces on existing properties. Legal in Massachusetts, local zoning rules apply. Boston Building Concepts is a Massachusetts ADU contractor offering full-service design, permitting, and construction of garage conversions, in-law suites, and detached ADUs.
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Amex Construction is a Hanover-based design-build ADU contractor serving Massachusetts' South Shore. They manage detached ADUs, barn conversions, and basement suites, handling design, permitting, septic upgrades, and construction under one contract.
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Honorato Company offers a structured construction process in Boston, covering ADUs, garage conversions & renovations. From consultation to final walkthrough, they ensure transparency, permitting, design, and clear communication throughout.
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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.
read moreNorth Andover, Massachusetts, is a charming town with deep colonial roots, a vibrant town center, and a mix of historic properties and newer residential developments. As housing demand continues to grow in Essex County, many homeowners are turning to ADU contractors in North Andover, MA to add accessory dwelling units to their properties. Whether you own a historic home near the Town Common or a newer property in one of North Andover's residential neighborhoods, a well-built ADU can significantly increase your property's value and provide additional rental income or multigenerational living space.
Before breaking ground, it's essential to understand that ADU construction in North Andover is governed by local zoning bylaws as well as Massachusetts state law. Under Massachusetts General Law Chapter 40A, Section 3, municipalities are required to allow ADUs in single-family zoning districts, which has opened new opportunities for homeowners. However, North Andover's local zoning bylaws may still impose specific requirements that your ADU contractor must navigate carefully, including:
Experienced ADU builders in North Andover are skilled in constructing a variety of accessory dwelling unit types suited to the town's diverse housing stock. Given the prevalence of larger colonial and cape-style homes in the area, basement conversions and attached additions are particularly popular. Common ADU types include:
Hiring a local ADU contractor familiar with North Andover is a critical advantage. Local professionals understand the town's permitting process through the North Andover Building Department, have established relationships with local inspectors, and are familiar with the specific soil conditions and utility infrastructure common in the area. They can also help ensure your ADU design is sensitive to the town's historic and architectural character, which is especially important near protected historic districts.
When searching for the best ADU contractors in North Andover, Massachusetts, look for licensed and insured professionals with proven experience in Essex County, strong local references, and a clear understanding of both state ADU legislation and North Andover's local bylaws. A qualified contractor will guide you from initial design through final inspection, ensuring your project is completed on time, on budget, and fully compliant.