Beantown Builders, Inc.

181 North Montello Street, Brockton, MA 02302 16.3 miles

Beantown Builders, Inc. is a Greater Boston ADU contractor offering full-service design, permitting, and construction. Projects include detached ADUs, garage conversions, and in-law suites, with budgets from $15,000 to $1M+.

Mass Tiny Homes

800 Lexington Waltham Plaza #1012, Waltham, MA 02451 8.8 miles

Mass Tiny Homes helps you build the perfect ADU for your needs, whether it be for aging parents or rental income, with an easy, streamlined process from start to finish.

Coastal Modular Homes

271 Post Road, Wakefield, RI 02891 30.6 miles

The Backyard Homes line of ADUs are manufactured in over a dozen production facilities and available in 48 states. After being constructed in one of our modern plants the unit is delivered to the project site for the builder to install.

Studio Luz Architects

4238 Washington Street, Boston, MA 02131 3.2 miles

Eco-Friendly

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.

ADU Of Massachusetts

56 Depot St, Duxbury, MA 02332 28.8 miles

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.

New England Outdoor

37 Oakland Avenue, Methuen, MA 01844 29.2 miles

55 years in business Prefab Specialist

New England Outdoor, a family-owned business in Methuen, MA, builds custom sheds, garages, pavilions, and ADUs across New England. Specializing in ADU construction, garage conversions, and in-law suites, they handle design, permits, and zoning guidance.

Millbrook Construction Corp.

34 Dewey Street, Saugus, MA 01906 12.3 miles

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.

Ruhan General Contracting LLC

344 John L Dietsch Boulevard, Attleboro, MA 02763 25.6 miles

Ruhan General Contracting LLC builds home additions and ADUs in North Attleboro, MA. Services include room additions, in-law suites, second-story additions, and detached ADUs, covering permits, design, and finish carpentry throughout Massachusetts and Rhode Island.

Steveworks LLC

108 Cabot Street, Newton, MA 02458 5.9 miles

Eco-Friendly

Steveworks LLC completed a whole house remodel in Newton, redesigning the floor plan, replacing windows, siding, and roofing, and upgrading insulation. They also built an accessible ADU above a garage, featuring a full kitchen, curbless shower, and chair lift for aging-in-place living.

Hawthorn Builders

97 Chapel Street, Needham, MA 02492 8.2 miles

Luxury Builds

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.

Woodland Builders

195 Hanover Street, Hanover, MA 02339 19.2 miles

Luxury Builds

Woodland Builders is a full-service ADU builder serving South Shore, MA, including Hingham, Plymouth & Scituate. They manage design through construction, ensuring quality, compliance, and streamlined project management for accessory dwelling units.

Auburndale Builders

151R Adams Street, Newton, MA 02458 6.2 miles

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.

BuildX - Your Building & ADU Experts

24 Rockland Street, Hanover, MA 02339 19.2 miles

Licensed 40 years in business

BuildX is a premier ADU builder in Southeastern Massachusetts with 40+ years of experience and $450M+ in projects. Offering custom stick-built ADUs, a 100-day build guarantee, and transparent pricing starting from $254,540.

SRH Homes

99 South Road, North Hampton, NH 03862 46.2 miles

Eco-Friendly Luxury Builds

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.

13 Gables Inc

64 Millbury Road, Worcester, MA 01540 41.3 miles

Licensed 38 years in business

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.

Other cities in Massachusetts

What you need to know

Building ADUs in Boston's Historic Urban Landscape

Boston, Massachusetts is one of America's oldest cities, featuring a dense urban fabric of historic brownstones, triple-deckers, and century-old neighborhoods. This unique character makes working with experienced ADU contractors in Boston absolutely essential. The city's aging housing stock, narrow lot lines, and strict historic preservation requirements create a complex environment that demands specialized knowledge from any contractor tackling an Accessory Dwelling Unit (ADU) project.

Boston's ADU Regulations and Zoning Requirements

In 2021, Boston significantly expanded its ADU program through the Additional Dwelling Unit Program, allowing owner-occupants in all Boston neighborhoods to add one ADU to their property. This was a major policy shift that opened up new opportunities for homeowners. Key regulatory points that qualified ADU contractors in Boston, MA must navigate include:

Types of ADUs Boston Contractors Commonly Build

Given Boston's dense residential neighborhoods, the most common ADU types differ from those seen in suburban or western U.S. cities. Skilled Boston ADU contractors frequently work on:

Why Hiring a Local Boston ADU Contractor Matters

Hiring a contractor with deep local expertise is critical in Boston. Local ADU contractors understand the nuances of working with Boston's aging infrastructure, including outdated electrical panels, cast-iron plumbing, and older foundation systems common in neighborhoods like Jamaica Plain, South Boston, Dorchester, and Roxbury. They also maintain established relationships with the city's permitting offices, helping to streamline approvals and avoid costly delays.

Cost of Building an ADU in Boston

Due to high labor costs and the complexity of urban construction, ADU construction costs in Boston typically range from $150,000 to $350,000 or more, depending on the scope and type of project. Basement conversions tend to be more affordable, while detached units or projects in historic districts can cost significantly more. Working with a reputable Boston ADU contractor ensures your investment is protected and your project meets all local code requirements.

ADU Contractors near Boston, MA