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The Best Home Addition Contractors in Boston, Massachusetts

22 Min Read

Boston, Massachusetts has a small-town atmosphere with all the perks and amenities of a big city. The metropolitan area has a diverse and international food scene and is close to world-class schools, jobs, healthcare, and many cultural offerings. The city has an edge in science and technology yet is traditional in its passion for sports, such as rooting for local favorites at Fenway Park. Boston is steeped in culture and pride. From the Old North Church to the Institute of Contemporary Art, it is a place where sports fans, artists, and business people congregate.

Boston is a perfect place to settle down for young families, recent college grads, retirees, or professionals. If you’re not finding the perfect home here or are outgrowing your current one, then get to know twenty of the best home addition contractors in Boston, Massachusetts. These contractors were handpicked based on their experience, expertise, and impressive portfolios.

Sea-Dar Construction

580 Harrison Ave. Suite 4W, Boston, MA 02118

Sea-Dar Construction’s projects over the past three decades have ranged from luxury urban residences and custom suburban homes to large, technically complex, institutional and commercial structures. The firm manages each project with the same commitment to quality and customer service, regardless of size or complexity. The firm has focused on building a collaborative relationship with clients and stable partnerships with talented architects, designers, and superior subcontractors who are passionate about completing projects of quality and refinement. The firm has built a reliable and trustworthy reputation through its ability to consistently exceed client expectations.

Over the years, the firm has gained considerable recognition for its high-quality projects, including features for prestigious publications such as Boston Home, New England Home, A Sense of Place, and Architectural Record. The classic home shown here underwent an extreme makeover, which involved completely gutting and remodeling it with modern features and systems. The project also included a home addition at the rear to add space for a much-needed kitchen expansion. The kitchen is a well-balanced mix of classic and modern elements. Its wooden cabinetry and island contrast with the stainless steel appliances and black and white walls and flooring.

Carpenter & MacNeille

106 Western Ave., Essex, MA 01929

Carpenter & MacNeille has been providing clients in the Northeast with award-winning architectural design, interior design, construction, woodworking, and property services since 1996. Whether building from the ground up or renovating existing structures, the firm’s projects meet the highest modern requirements and quality standards. The firm pays close attention to the natural environment and to selecting materials, compositions, and characteristics that best reflect each property’s individual assets, while working within the client’s schedule and budget. With a team of highly-skilled experts, the firm is confident in its ability to deliver outstanding projects that reflect the client’s personality and lifestyle.

This featured home renovation and addition project won 2014 Best of Boston Home, awarded by Boston Magazine. The firm provided architectural design, interior design, and construction services to complete the 1920 American Foursquare project. The house has been completely renovated, including the addition of a garage, mudroom, game room, and conservatory. The existing kitchen, dining room, and living room on the first floor were also renovated. The home is brighter and more welcoming with its huge windows and warm and neutral color scheme.

Feinmann, Inc.

27 Muzzey St., Lexington, MA 02421

Founded in 1987, Feinmann, Inc. provides architectural design, home remodeling, additions, new home construction, space planning, custom cabinets, and design-build services throughout the Greater Boston area. With nearly 35 years of experience, the firm has built an outstanding portfolio of over 1,300 projects for more than 640 satisfied clients. One of the leading design-build firms in Boston, it is committed to delivering unique, one-of-a-kind designs, a streamlined and optimized process, impeccable craftsmanship, and respect for clients’ schedules and budget. This level of dedication has resulted in numerous positive reviews from clients who have experienced the firm’s high level of quality and unsurpassed professionalism.

A perfect example of the firm’s impressive projects is this European-styled, contemporary home addition in Belmont. The firm was tasked with transforming a conventional kitchen into an open, modern area with clean, contemporary elements, custom woodwork, and a backdrop for the homeowners’ artwork. Feinmann expanded the kitchen by shoving out the outer wall and creating an architectural angle, in tune with the customers’ desire for a contemporary design. It also raised the ceiling, making the space feel even larger and more expansive.

S+H Construction

45 Brighton St., Belmont, MA 02478

S+H Construction specializes in unique and complex residential renovation and construction projects. Since 1978, the firm has offered its extensive range of services to Boston and eastern Massachusetts, handling each intricate aspect of their projects from start to finish. The firm has a team of devoted construction specialists with a combined experience of hundreds of years in the industry, committed to delivering projects on time and within budget without compromising the firm’s high standards of quality. The company has built solid partnerships with professional project partners, architects, and designers to supplement its in-house project team. With its dedication to guaranteeing customer satisfaction, the firm has earned many testimonials and repeat clients for its unsurpassed quality and impeccable professionalism.

The firm has been featured in several publications, including Modern Luxury Interiors, Boston Magazine, Boston Design Week, and USA Today Network. One of the firm’s notable projects is this Victorian home addition project in Cambridge, Massachusetts. As part of a larger renovation, the firm updated and reconfigured the house extensively, with the additions in the back. The firm ensured that the new additions were seamlessly integrated into the existing historical architectural style of the home. The firm also replaced all of the home’s systems, including boilers, bathtubs, and high-velocity HVAC.

Howell Custom Building Group

370 Merrimack St. Suite 405, Lawrence, MA 01843

Stephen and Susan Howell, a husband and wife team, founded the firm in 1997 to combine their professional backgrounds in engineering, project management, residential construction, and marketing. Now nearly 25 years later, the firm has proven its consistency in providing exceptional projects throughout Massachusetts. The firm has built an impressive portfolio, completing more than 700 projects that reliably exceed client expectations. The firm’s expert team handles each project with a personalized approach and works hand-in-hand with clients and partners to ensure no detail is missed. Its disciplined and meticulous management keeps projects on time and within budget, minimizing surprises and providing high-quality craftsmanship.

The firm has earned many prestigious awards through the years, including the recent 2021 PRO New England Gold Award Entire House $500k+, 2021 Best of Northshore (BONS) Home, and the Editors Choice Builder/Renovation for six consecutive years. Shown here is a home addition and renovation the firm completed north of Boston. Its work completely transformed a colonial revival into a New England Modern Farmhouse. The family room’s roof was reframed with an exposed Douglas Fir timber frame, which is both structural and decorative. A new 1.5 story picture window reflects the shape of the new timber frame while capturing backyard views. The result is rustic, yet sophisticated, adding warmth and stunning architectural detail to the home.

FH Perry Builder

5 Cedar Street #160, Hopkinton, MA 01748

With over four decades of construction experience, FH Perry Builder has an excellent track record in Boston and its neighboring areas. The firm specializes in kitchen and bathroom remodeling, whole house renovations and additions, and historic restorations. With its unique, customer-focused process, the firm takes time to listen to its clients and understand their vision before turning it into a set of blueprints. The firm identifies, evaluates, and manages all aspects of each project—paying close attention to unique feature requirements, complexities, or schedules. It strives for continuous learning and improvement of its processes to deliver a smooth, seamless, and stress-free construction experience for its clients.

This master suite second-floor addition is one of the firm’s remarkable projects. The addition has a more modern design than the existing house, which is an antique gem. The firm nevertheless managed to seamlessly incorporate the new space into its surroundings. The firm also constructed a master suite that directly connects to the dressing room and bathroom. An elegant library on the second floor and a mudroom on the first floor were also included in the project.

Kistler and Knapp Builders

916 Main St., Acton, MA 01720

Kistler and Knapp Builders has grown to be one of the most highly regarded construction firms in the Greater Boston area, with over 35 years of experience. The firm specializes in custom homes, renovations, additions, and historic restorations. Its portfolio showcases exceptional projects completed with the highest level of craftsmanship. Throughout the construction process, Kistler and Knapp Builders has always acknowledged the necessity of excellent communication and close collaboration with the entire team. It ensures that every stakeholder is updated and every document is easily understood by both architects and owners. This strategy has resulted in satisfied clients who have had an easy and seamless construction experience.

With many features in prestigious publications such as Architectural Digest, Builder + Architect, and New England Home, the firm has proven its reputation as one of the best in the area. In this featured project, the firm partnered with architect Foster Associates. They kept the traditional and classic styling of the home, bringing in a neutral, earth-toned color scheme and large windows for more natural light. The firm successfully integrated the old with the new, creating a seamless flow between the spaces.

Groom Construction Co., Inc.

96 Swampscott Rd., Salem, MA 01970

Brothers Tom, Dwight, and Dave Groom together with Scott Faulkner incorporated Groom Construction in 1985. For more than four decades, the firm has offered its clients reliable preconstruction, construction management, design-build, and general construction services throughout the US. In the late 1980s, the company’s portfolio expanded into the commercial industry. The firm’s team consists of devoted and skilled individuals who provide customized service with quality craftsmanship and professionalism. For forty years, the firm has always placed its clients first, creating spaces that realize their needs and goals and keeping within the schedule and budget.

This old, one-story house was completely renovated and tailored to the needs of a growing family. The open kitchen, dining and living areas, and family spaces enhance the family’s lifestyle. The master suite has a marble bathtub, a walk-in closet, and a spacious office area where the children can do homework. The children’s bedrooms make up the second-story addition, which has water views from every window. The lower level accommodates the guest suite, family room, and fitness room, all of which open onto a fieldstone patio that serves as another casual gathering space for the family.

New England Design and Construction

103 Terrace St. Boston, MA 02120

New England Design and Construction is a group of passionate and creative experts who believe that well-designed and constructed spaces can significantly enhance a person’s lifestyle. Founded in 2006, the firm has completed many outstanding projects, including whole home renovations, remodels, additions, and architectural and interior design. The firm employs a one-of-a-kind method that combines a client’s vision with the firm’s design and construction expertise to create projects that fulfill the goals for the space. The firm approaches each project with meticulous planning and attention to detail to consistently ensure customer satisfaction.

The firm has earned numerous awards, including the recent 2020 Guildmaster Distinction Award. For the project shown here, the firm created a two-level addition with four bedrooms, two bathrooms, a master suite, and a few unique features, like pull-out, under-stair storage and a wrap-around bench in the doorway. This outstanding renovation doubled the home’s square footage and usable area, increasing its overall value.

Mitchell Construction Group

511 Main St., Medfield, MA 02052

Since 1987, Mitchell Construction Group has been providing its services in the Greater Boston area, specializing in architecture, interior design, and construction. Over the past 30 years, the firm has remained focused on listening to its customers’ wants and needs when designing unique, one-of-a-kind spaces. From materials to craftsmanship to customer service, the firm incorporates its experience and expertise to create a stress-free experience for its clients. The firm assigns a personal team to each customer for a customized approach, focused management, and meticulous attention to detail. It has developed an impressive portfolio of projects completed on time and within budget while maintaining high standards of quality.

This older home, for example, was cleverly expanded for a young family who had outgrown it. The original intention was to provide room for a second vehicle. The firm built an addition to the existing one-car garage and added a completely new master bedroom above it. The house was entirely re-sided, and a new roof and front porch were installed.

Fresh Start Contracting

30 B St., Burlington, MA 01803

Fresh Start Contracting is a general contractor based in the Greater Boston area, founded in 2006. The firm specializes in residential projects, including custom home renovations, new construction, additions, and home maintenance programs. With a team of estimators, master craftsmen, project managers, and highly-skilled laborers, the firm approaches each project with close attention to detail. Every project is marked by quality, professionalism, and a high level of communication to ensure successful outcomes. This strategy is made possible through close collaboration with designers, site workers, and managers, using the most up-to-date technology and digital solutions.

In 2019, the firm partnered with Dana Ozik Architecture to complete this second-story dormer addition in Arlington, Massachusetts. The firm completely transformed the space, with an emphasis on modernizing the home’s architecture and décor. The existing front porch was demolished, and the new open area was wrapped in cedar shiplap as one of the primary design alterations. In addition, the home’s second level received a new layout, including a new master suite. Finally, a gabled dormer was built to transform the third floor from unfinished storage into a new space with two bedrooms, a full bath, and a laundry closet.

Merz Construction

168 Bingham Rd., Carlisle, MA 01741

Merz Construction is a high-end, custom home builder serving the Greater Boston area. Since its inception by Jonathan Merz in 1986, the firm has collaborated with dozens of architects to deliver exceptional projects. The firm believes that a collaborative and team-oriented culture is the key to its success. It prioritizes open communication throughout its client-focused processes to ensure a smooth and stress-free experience. The firm has received positive feedback from satisfied clients for its meticulous and disciplined project management, unsurpassed quality, and outstanding customer service.

The firm has won several awards, including the PRISM Award for Outdoor Living and the Boston Society of Architects Honor Award for Design Excellence. The historic home and contemporary addition shown here were remodeled for large gatherings with the creation of an open kitchen, family room, and dining area. The new timber frame barn is made of old-growth Douglas Fir with an automatic, light-filtering glass curtain wall to bring more natural light to the space.

Masters Touch Design Build

24 Water St., Holliston, MA 01746

Since 1997, Master Touch Design Build has provided creative and cutting-edge digital solutions for home remodeling and construction projects throughout Massachusetts. Under the leadership of founder Doug Masters, the firm’s team of expert designers and master craftsmen provides a hands-on, personalized approach to ensure high-quality projects. Over the years, the firm has remained consistent with its core values of close collaboration, open and honest communication, and mutual respect to create an enjoyable process for its clients. Its cost-effective design-build method ensures that every project is completed on time and within budget without compromising on quality and integrity.

One of the firm’s notable projects is this primary suite addition in Medfield, Massachusetts. The firm seamlessly integrated the new addition into the existing architecture. With a unique mix of classic and modern elements, this transitional bedroom is sleek and sophisticated. The muted gray walls and warm hardwood floors create a gentle contrast. The windows add to the relaxing feel of the space by bringing in more natural light.

Catamount Builders

850 Summer St. Suite 208, Boston, MA 02127

Catamount Builders has been in business since 2004 as a full-service general contractor, specializing in custom homes, remodels, and additions. Whether building a unique house from the foundation to completion or simply remodeling the exterior, the firm is confident in its ability to deliver outstanding projects completed on schedule and within budget. The firm’s hands-on approach, personalized touch, and specialized crew provide a unique building experience for clients. The firm handles every project with great care and meticulous attention to detail, consistently resulting in unsurpassed quality. This level of dedication has resulted in many satisfied clients whose expectations have been exceeded.

The firm partnered with Colin Smith Architecture to deliver this custom renovation and addition for a home in Lexington, Massachusetts. The new hardwood flooring in the living room, combined with a vaulted ceiling, french doors, and luxury windows, gives the room a spacious look. The white cabinetry, paired with a darker granite countertop, provides an open, luxurious, and light-filled atmosphere for the kitchen. Because of the half-island, the kitchen can be converted into a more open floor design.

WORKS by Jesse DeBenedictis

90 Park St., Beverly, MA 01915

WORKS by Jesse DeBenedictis has provided design-build renovation, remodeling, and construction services to the North Shore of Boston since 2001. With two decades of extensive construction experience, the firm has completed numerous remarkable projects that capture the clients’ vision, needs, and goals for the space. The firm has an in-house team of highly-skilled carpenters, painters, project planners, and managers committed to delivering every project with honest communication and close collaboration. The firm has built solid relationships with clients, subcontractors, suppliers, and trade partners dedicated to providing one-of-a-kind designs that reflect each client’s personality and lifestyle. Over the years, the firm has gained a long list of satisfied clients and many positive evaluations and testimonials.

The firm is affiliated with BNI, NARI, and the North Shore Chamber of Commerce. This home addition is a perfect example of the firm’s impressive work. This beautiful and functional family room was added to an Andover, Massachusetts home. The art and furnishings in the space complement the built-in cabinetry and soothing palette of this addition. The space is perfect for spending quality time with family members.

PEGASUS Design-to-Build, LLC

727 Main St., Melrose, MA 02176

PEGASUS Design-to-Build is a general contracting firm that specializes in remodeling services, including kitchen design-remodeling, bathroom design-remodeling, renovations, and additions. Founded in 2003, the firm has completed many outstanding projects across Boston and its nearby areas. With a highly-skilled and professional team, the firm provides a high level of quality in its design-build projects, offering a one-stop solution by handling every aspect of the project from start to finish. Its unique design-build process approaches each project with meticulous attention to ensure no detail is overlooked. The firm has remained consistent in its objective of delivering projects that are tailored to fit the client’s needs.

The firm’s impressive portfolio showcases a wide variety of styles, including modern and contemporary. For the project shown here, the client needed a relatively separate living space as more family members moved into the home. The firm turned this unfinished basement into two bedrooms, an office, a dining space, a laundry room, a bathroom, a living room, and a half-kitchen. The basement now receives plenty of natural light with the addition of egress windows.

Gerry Dunleavy Construction Corporation

P.O Box 363, Winchester, MA 01890

Gerry Dunleavy Construction Corporation has a stellar reputation in Winchester and the Greater Boston area for consistently delivering excellent craftsmanship and unmatched professionalism. Since 1981, the firm has been building, rebuilding, and restoring exceptional homes, earning many satisfied clients through its process. The firm believes that close collaboration among clients, designers, and builders is the key to a successful project. It focuses on maintaining open communication throughout the project’s duration to keep every stakeholder on the same page. Throughout its four decades of operations, the firm has consistently delivered the best possible product in a safe, cost-effective, and timely manner.

In this featured project, the firm completed a three-level addition and renovation for a home in Boston, Massachusetts. The project included a new kitchen, family room, office/study space, mudroom, master bedroom, and master bathroom. The existing house featured custom cabinetry and millwork. The firm kept the same styling throughout, focusing mainly on a large, traditional, open layout with light wooden floors and a neutral color scheme.

Britton Homes Remodeling

37 Hawthorne Rd., Ashland, MA 01721

Britton Homes Remodeling is an Ashland, Massachusetts-based home remodeler renowned for its comprehensive project management and flawless execution. Since 1999, the firm has served the Greater Boston area and Eastern Massachusetts with remarkable projects. The firm is dedicated to providing unsurpassed customer service through its client-centered processes. With a passionate, professional staff, the firm is confident in its ability to take its client’s ideas and get high-quality projects done on time and within budget. It uses the best materials, chosen for their durability. Project supervisors handle each project with a hands-on, customized approach to ensure everything meets the firm’s high standards of quality.

This home addition project in Boston, Massachusetts, is one of the firm’s remarkable projects. On top of an existing garage, the firm built a dining room addition and transformed the garage into an in-law bedroom. The mid-sized, transitional dining room uses beige walls and ceramic tile flooring for a sleek and sophisticated space. The stone-clad wall and wooden furniture serve as a rustic accent to the overall minimalistic feel.

B&D Building and Remodeling

1161 Broadway, Somerville, MA 02144

B&D Building and Remodeling, founded in 1979, provides general contracting services, specializing in residential interiors, exteriors, and home additions. From minor home remodeling projects to major residential extensions and commercial work, the firm handles every intricate detail of their projects from start to finish. Regardless of the size or complexity of the project, the firm provides high-quality construction, realistic scheduling, and consistent, effective communication. The firm has a team of seasoned construction experts committed to providing clients with excellent, high-quality building and meticulous attention to detail. With the team’s dedicated and passionate mindset, the firm consistently delivers outstanding projects that ensure customer satisfaction and exceed expectations.

The firm has been featured in several publications, including Boston Home Magazine. This sunroom addition in Arlington, Massachusetts, is a testament to the firm’s high-quality craftsmanship. This mid-sized, elegant sunroom focuses mainly on light, wooden design elements to bring a warm, welcoming, yet refined feel to the space. The new addition blends seamlessly into the home’s existing exterior.

Hammersmith Associates

292 Newbury St. #541, Boston, MA 02115

Hammersmith Associates is a full-service general contracting company with over 20 years of extensive construction experience. Founded by husband and wife team Mark and Dawn-Michelle Smith, the firm ensures open communication throughout the project to keep everyone up-to-date. Over the years, the firm has solidified its well-deserved reputation for meticulous attention to detail, and its collaborative processes have established trusted connections with satisfied customers. The firm’s expert team ensures that every project proceeds efficiently from start to finish, paying particular attention to hitting construction milestones and crucial deadlines.

This top floor addition and home renovation in Back Bay, Boston is one of the firm’s impressive projects. Custom ironwork for the railings and copper cladding for the headhouse were utilized to complement the neighborhood’s architectural style. The firm handled every facet of this single-family brownstone’s renovation. Painting, refinishing hardwood floors, and installing digital home technologies were all part of the project.


  • Brooke Adams

    Brooke is a Deputy Editor at Boston Architects with around five years of professional experience as a writer and editor in the construction and home improvement space. Her expertise covers a wide range of topics including addition construction, home remodeling, and landscape design. Brooke has a Bachelor's degree in Civil Engineering, and she also brings extensive experience as a project manager for a top construction firm, overseeing multi-million dollar projects. Additionally, she is certified in LEED and OSHA safety standards.  Expertise: Addition Construction, Home Remodeling, Landscape Design  Key Highlights: Over 5 years of experience writing and editing in the construction space, Deputy Editor at HomeBuilderDigest Education: Syracuse University, Bachelor of Science in Civil Engineering; Certificates in Public Relations and Social Media