Stella Home Services is a Greater Boston ADU contractor specializing in basement apartments, garage conversions, in-law suites & home additions. They manage design, permitting & construction for fully functional accessory dwelling units.
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J. B. Cote Construction is an ADU contractor in Rhode Island & Massachusetts, specializing in detached ADUs, garage conversions, in-law suites & more. They manage design, permitting, zoning & energy-efficient construction from start to finish.
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ADU Of Massachusetts is a full-service ADU builder specializing in design, permitting, and construction of accessory dwelling units. Serving homeowners statewide, they build attached, detached, garage conversions, in-law suites, and backyard cottages.
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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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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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Millbrook Construction Corp. in Boston specializes in ADU construction, handling design, permits, and builds. Services include detached ADUs, garage conversions, and in-law suites for rental income, family housing, or added property value.
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13 Gables Inc, a licensed MA general contractor with 38+ years experience, builds custom ADUs including detached units, garage conversions & in-law suites. Massachusetts' 2025 Affordable Homes Act now allows ADUs by right in single-family zones.
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Bethoney Builders LLC is a South Shore residential contractor specializing in ADU construction, home additions, custom builds, and renovations. Services include in-law suites, garage conversions, finished basements, and structural repairs.
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House Improvement LLC builds fully insulated ADUs with electricity and climate control, ideal for home offices or studios. They also construct storage sheds, carports, gazebos, and pergolas for diverse residential outdoor needs.
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Trusted Boston ADU builders specializing in attached, detached, and two-story accessory dwelling units. Stick-built construction ensures code compliance and lasting value. Services include design, permitting, and full project management for multigenerational living or rental income.
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Luxe & Co. Accessory Dwellings is a Massachusetts ADU builder offering full-service design, construction, and permitting. Founded by Hope Beckman and Sage Conti, they specialize in high-end ADUs including in-law suites, carriage houses, and home offices.
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Massachusetts' new ADU legislation allows homeowners to build detached or attached accessory dwelling units. CZ Construction Management LLC helps with planning, permits, and construction of ADUs across Massachusetts, including Greater Boston.
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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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Hawthorn Builders offers end-to-end ADU construction, managing consultation, design, permitting, and building. As a detached ADU and garage conversion contractor, they complete accessory dwelling units in ~90 days with minimal disruption.
read moreWaltham, Massachusetts, often called the "Watch City" for its historic watchmaking industry, is today a thriving hub of biotechnology, research, and higher education. Home to Brandeis University and a dense concentration of tech and life sciences companies along Route 128, Waltham has seen significant residential demand. This growth has made Accessory Dwelling Units (ADUs) increasingly popular among homeowners looking to maximize their property value and address the region's tight housing market. Hiring experienced ADU contractors in Waltham, MA is essential to navigate the city's specific building requirements and make the most of your investment.
Waltham operates under its own zoning ordinances, and ADU projects must comply with the city's building and zoning codes. Massachusetts state law, particularly the 2021 Zoning Act (Chapter 40A amendments), has pushed municipalities to be more ADU-friendly, and Waltham has adapted accordingly. Key regulatory considerations include:
Skilled ADU contractors in Waltham are experienced in building a variety of unit types suited to the city's diverse housing stock, which includes Victorian-era homes, mid-century colonials, and modern condominiums. Common ADU types include:
Working with a local ADU contractor familiar with Waltham's permitting process can save you significant time and money. Local professionals understand the city's inspectional services, have established relationships with municipal departments, and are knowledgeable about neighborhood-specific challenges such as older utility infrastructure and historic preservation considerations. Whether you're looking to generate rental income, house a family member, or increase your home's resale value, a qualified Waltham ADU contractor will guide your project from design through final inspection efficiently and compliantly.