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The Best Home Addition Contractors in Washington, D.C.

17 Min Read

As one of America’s largest cities, Washington, D.C. combines a small-town atmosphere with a cosmopolitan and sophisticated feel. International embassies, massive populations, and a diversified culinary culture make up the city’s unique skyline, keeping inhabitants and tourists busy exploring every inch of it. Washington is an excellent place to settle down for singles and families, foodies and sports enthusiasts, as well as ambitious young professionals.

If you are looking to expand your home or elevate your lifestyle, selecting the most suitable contractor is a critical step for a successful home renovation. Our editorial team has listed the best home addition contractors in Washington, D.C., to help you with your next renovation project.

Case Design/Remodeling

1327 14th Street NW, Suite 200, Washington, DC 20005

Since its establishment in 1961, Case Design/Remodeling has remained dedicated to delivering incredible home transformations powered by the client’s ideas and inspirations. Despite its impressive sixty years of extensive remodeling experience, the firm continuously focuses on improving and streamlining its processes. The firm provides custom design solutions, professional project management, and expert craftsmanship to guarantee a successful project outcome. On every project, the firm strives to accurately capture ideas to tailor-fit the design to the client’s wants and needs. The firm handles every project efficiently thanks to its team of highly qualified architects, remodelers, designers, and project managers—all providing unsurpassed quality no matter the complexity or cost.

Over the years, the firm has gained quite a bit of recognition for its impressive work thanks to several awards, including the recent 2021 Top 500 Remodelers presented by Qualified Remodeler Magazine. The project featured here is a home addition in Washington, D.C. This transitional family room combines various design styles using a mix of traditional and contemporary elements. The neutral gray couches and jet black accent wall contrast with the stark white cabinetry for a more refined, yet comfortable look.

Anthony Wilder Design/Build

7913 MacArthur Boulevard, Cabin John, MD 20818

Anthony Wilder Design/Build is an award-winning firm that specializes in custom houses, interior remodeling and design, whole-house renovations and additions, and historic restorations. Through its full-service custom architectural, construction, and interior design services, the firm has remained consistent in its goal to deliver an excellent design-build experience for every client over the course of its thirty years in the business. The firm takes a personal approach to every project: open communication and close collaboration through its in-house team of architects, designers, historians, contractors, managers, and staff are all central elements of the firm’s process. This level of commitment and expertise has resulted in an impressive portfolio that has consistently exceeded client expectations.

The firm delivers the latest designs and cutting-edge construction technology on every project to ensure that every renovation or addition is seamlessly integrated into its existing architecture. One of the firm’s notable projects is a whole house renovation in Washington, D.C. The project included a home addition of a yoga studio that aimed for modern styling. With its warm hardwood floors and large windows that bring in more natural light, the space is perfect for relaxation and recreation.

Landis Architects/Builders

7059 Blair Road NW, Suite 300, Washington, DC 20012

With over three decades of local experience, Landis Architects/Builders has an impressive track record of 145 architectural awards, 241 kitchen remodels, and 40% of its projects come from repeat clients. Founded in 1990, the firm has remained consistent in its core mission of delivering exceptional projects through its commitment to quality, service, and innovation. The firm also uses modern technologies for a seamless construction experience. Thanks to its passionate team, the firm incorporates modern technologies and a meticulous management style. The firm generates a virtual reality link to quickly visualize and accurately capture the client’s ideas. It also conducts regular meetings and reports regularly to keep clients up-to-date through communication software.

Over the years, Landis has proven its reputation as one of Washington’s top renovation firms through its excellent design and exceptional customer service. In the project featured here, the firm provided its home addition services for this 1926 Crestwood Home. The 500 square-foot addition included a zen home office, a powder room, and an extra closet space for the main bedroom. The firm carefully curated and constructed a space that reflects a great deal of symmetry and functionality, successfully achieving the client’s goal for the area.


7900 Westpark Drive, Suite A180, McLean, VA 22102

Since 1988, BOWA has served clients throughout the Greater Washington, DC area and Virginia’s Hunt Country with its remodeling expertise. The firm’s area of expertise lies in luxury renovations ranging from kitchens to house and condominium remodeling. From the idea conceptualization to the design and build phase and continuing post-construction and customer service, the firm focuses on delivering a smooth remodeling process for every client. This is made possible through the firm’s dedicated team of professionals, each with more than thirty years of experience. With its commitment to delivering the highest quality craftsmanship and world-class customer service at every step, the firm has received positive responses from its satisfied clients resulting in 85% of its projects being from repeat clients and referrals.

One of the firm’s impressive projects is a home addition project located in Northwest, D.C. The client needed extra living space, so the company extended out from the family kitchen and lower-level family room to meet their needs. A screen porch, a small outdoor grill deck, and a media and gaming room were created for the family to use and enjoy.

CARNEMARK design + build

7550 Wisconsin Avenue, Suite 120, Bethesda, MD 20814

Operating with a client-responsive and eco-sensitive process since 1987, CARNEMARK has created exceptional projects by combining outstanding designs with cutting-edge products, techniques, and services. The firm’s expert team reimagines every area with a tailored approach to the client’s lifestyle, including home, kitchen, bathroom remodels and additions, and condo renovations. Over the years, the firm has perfected a five-step process that comes straight from its extensive experience. From design conceptualization and client communication to construction methods, the firm guarantees a smooth and seamless remodeling process while delivering high-quality project outcomes on time and within budget.

The firm has been recognized for its unsurpassed quality through several prestigious awards, including the 2021 Decade of Excellence – Chrysalis Award. This featured project is one of the firm’s notable home addition projects in Washington, D.C. The client’s 1960s ranch-style home was reimagined to create a more spacious area for entertaining. Part of the additional space was converted into a contemporary patio by expanding the living room creating an outdoor nook on the ground level.

Glickman Design Build

15757 Crabbs Branch Way, Rockville, MD 20855

With over forty-five years of designing and creating spaces focused on building homes for life, Glickman Design Build has earned its well-deserved spot as one of the premier industry leaders in the Washington Metropolitan area. The firm’s diverse experience and expertise include home remodeling, home additions, custom-crafted aging-in-place-accessible design, and universal design solutions. Founded by Russ Glickman in 1975, the firm is dedicated to building living spaces that improve the quality of life for all its clients. Thanks to its team of design and construction experts, the firm can guarantee excellent design, quality craftsmanship, and unmatched advice and guidance for every project.

The firm has received national recognition throughout the years, including the 2017 Grand Award Winner Universal Design Whole House – NARI. One of the firm’s notable projects is a family room addition in the D.C. Metro. The well-balanced mix of clean and textured elements and expansive windows bring in plenty of natural light creating a warm and attractive place for the family to bond.

Four Brothers Design + Build

4009 Georgia Avenue NW, Washington, DC 20011

Four Brothers Design + Build offers one-stop-shop home remodeling services across the Washington, D.C. metropolitan area. This family-owned firm delivers architectural, design, and construction services entirely in-house with its unique design-build process. The firm’s name comes from a team of four brothers: Alfred, Ben, Kent, and Leroy Johnson. They started out as woodworking apprentices before realizing their passion for remodeling. They teamed up to form the firm in 2006. Fifteen years later, the firm has a solid reputation for quality craftsmanship and attentive customer service. The firm has also received plenty of great reviews and referrals thanks to so many satisfied clients.

In the project featured here, the firm reimagined a three-story home in Georgetown by adding a master bedroom and bath. Focusing on Cape-Cod interior styling, the firm incorporated light and airy color schemes with the muted gray walls and navy blue accents. Wooden furniture and a woven rug complete the overall casual, laid-back feel of the room.


8401 Connecticut Avenue, Suite 310, Chevy Chase, MD 20815

Wentworth offers a full range of remodeling services thanks to an in-house team of architects, interior designers, and construction experts. For over seventeen years, the firm has provided exceptional projects throughout Washington and neighboring areas in Montgomery County, Maryland, and Northern Virginia. From the design to construction up to the final project handover, the firm employs a comprehensive ten-step process to ensure open communication with every client throughout the project duration. This strategy has earned the firm plenty of satisfied clients, each testifying the firm’s capability to successfully deliver every project. Learn more about the firm and their work at

Wentworth has garnered an impressive portfolio over the years, including this remarkable home addition and remodel in Spring Valley, Northeast Washington, D.C. In the project featured in the photo, the firm aimed to create a family room that would be warm, inviting, and comfortable. This new facade hides a relaxing, family atmosphere, the firm deployed an earth-toned, neutral palette, a woven rug, hard floors, and rustic furniture. 

Gilday Renovations

9162 Brookville Road, Silver Spring, MD 20910

Gilday Renovations has been in the industry for forty-two years. The firm has remained consistent in creating a more efficient construction experience for its clients. The firm is one of the pioneers for design-build construction in Washington and it has continuously improved its processes and strategies to achieve its goals. The firm approaches each client and each project with a personalized touch. Each project gets its own team of architects, designers, craftsmen, and project managers—the best people to deliver the specific outcomes that successfully achieve the client’s wants and needs. Under the leadership of cousins Kevin Gilday and Tom Gilday, the firm’s customer-focused practices have earned many satisfied clients throughout the years.

The firm’s award-winning portfolio of master suites, kitchens, breakfast rooms, and interiors have been featured in various publications including Bethesda Magazine and Home & Design Magazine. A notable project of Gilday Renovations is the home addition and luxury porch in Chevy Chase, D.C. The interior remodeling and porch addition with a vaulted beamed ceiling and stone fireplace were part of the project. The firm has successfully completed the project by seamlessly integrating the porch into the original exterior of the building, creating an excellent, cohesive façade.

Blue Star

515 M Street SE, Suite 201, Washington, DC 20003

Based in Washington, D.C., Blue Star is an award-winning firm specializing in lifestyle-driven design and superior construction services. Since its inception in 2011, the firm has been dedicated to understanding every client’s vision and bringing it to life. Throughout the design phase to the construction and final project completion, the firm’s seamless step-by-step process ensures close collaboration with the client by keeping them updated every step of the way. Blue Star’s team is composed of architecture, design, and construction experts that are dedicated to delivering exceptional projects through functional and pleasing designs and quality craftsmanship.

The firm has won several notable awards during its decade in the business, including the 2020 Merit Award – CoTY from NARI. To retain the home’s original style while integrating modern elements, the firm worked on a complete remodel and home addition in this Capitol Hill Home. Blue Star reimagined the whole space by incorporating design features that reflected the client’s lifestyle and personal taste. The firm created a more efficient layout and maximized storage opportunities while retaining the original craftsmanship of interior wood pillars, radiators, flooring features, and a hand-lathed banister.

Glass Construction

2314 18th Street, NW, Washington, DC 20009

Glass Construction is committed to delivering the highest quality craftsmanship, world-class client service, and effective project management, whether for small kitchen renovations or full-scale new construction projects. With over thirty years of building expertise, the firm has worked with notable architects and owners to create one-of-a-kind, award-winning projects. Under the direction of Tom Glass, president and owner, the firm deploys efficient construction methods and cutting-edge management systems to deliver projects on time and on budget. The firm has earned positive feedback from its many satisfied clients, who have testified to the firm’s capacity to exceed expectations in every project.

The firm partnered up with Barnes Vanze Architects, Inc to remodel this home in Georgetown, Washington, D.C. The client’s living space was enhanced by the addition of a gourmet kitchen and a master suite. The firm kept the master suite sophisticated yet straightforward with white walls, cabinetry, and furniture paired with dark hardwood floors. A fireplace of dark stone serves as a great contrast to this clean, minimalist look.

Tabor Design Build

15740 Crabbs Branch Way, Rockville, MD 20855

Founded in 1986, Tabor Design Build has provided high-quality, three-dimensional design and luxury remodeling services throughout the Washington, DC, and Maryland areas. The firm was founded by John Tabor to provide a stress-free remodeling experience for its clients. Three decades later, the firm has remained steadfast in its original goals and continues to deliver top-notch projects on time and within budget. A dedicated and passionate team of design and construction experts handle each project with meticulous planning and close attention to the details.

The firm has demonstrated its capacity to produce effective and efficient projects, regardless of how basic or complicated they may be, and they’ve received several awards in the process. One of the firm’s notable awards includes the prestigious 2019 Grand Award Winner – Residential Addition $100,000 to $250,000 by The Capital CoTY, NARI. In this featured project, Tabor Design Build was tasked with a home addition in Washington, D.C. The project consists of a master bath addition and a screened porch. This contemporary bathroom was kept clean and straightforward with its neutral color scheme. The firm added an angular double sink and sleek cabinetry to the fully-enclosed shower area for a more modernized look.

Hopkins & Porter Construction, Inc.

12944-C Travilah Road, Suite 204, Potomac, MD 20854

Founded by Guy Hopkins Semmes and Michael Porter Denker in 1997, the firm has come a long way from its modest origins. Hopkins & Porter Construction, Inc. has grown from a two-man team to an influential group of professional artisans, designers, and project managers lead by Ray Hornsby during the firm’s four decades of operations. Thanks to its expertise in the remodeling industry, the firm employs a unique and consultative design-build process to understand every part of the client’s vision and turn it into a one-of-a-kind space. The firm’s client-centered approaches keep the clients updated and guarantee that everything is moving forward smoothly and seamlessly.

Thanks to the firm’s commitment to quality, creativity, and superior service the firm’s impressive work has been highlighted in several noteworthy publications, including the 2020 Forbes Magazine. Shown below are several projects the firm has completed. The kitchen features a large waterfall island with pendant lights while the bathroom’s space is maximized by added custom cabinetry. A neutral palette of grays and blues anchors the basement wine bar design and gives a contemporary feel to the entertaining space created there.

Impact Remodeling and Construction

4444 Connecticut Avenue, Suite 103, Washington, DC 20008

Headquartered in Washington, D.C., Impact Remodeling and Construction has provided design, project planning, and building services in the metro region since 2007. The firm has built a solid reputation as an industry leader through client-focused services, long-lasting relationships, and core values. Impact believes understanding its clients is a critical step in accomplishing a successful project. The firm’s extensive design-build and general contractor services are customized to the client’s needs and goals for a seamless construction experience. Learn more about them at

The firm’s unique portfolio includes diverse work styles, including contemporary, cabin, and ranch designs. Partnering with Bennett Frank McCarthy Architects, this featured project in Chevy Chase Village consisted of an extensive addition and whole-house remodel. The firm added a light-filled family room, a new kitchen, a basement remodel, and a second-floor master suite. Keeping the ranch and rustic styling consistent throughout the space, the firm used an earth-toned color scheme and wooden elements while adding a few accent pieces with a pop of color.

Hammer Design Build Remodel

5335 Wisconsin Avenue NW, Suite 640, Washington, DC 20015

Since its inception in 2004, Hammer Design Build Remodel has remained dedicated to its goal of providing the ultimate customer experience in Washington, D.C. The firm specializes in providing design-build services for various projects, including whole home renovations, home additions, and kitchen and bathroom remodeling. With an expert team of design-build professionals on staff, the firm consistently adheres to its core values of communication, excellence, respect, responsibility, positive attitude, integrity, and gratitude. No matter how complex the project is, Hammer Design Build Remodel is confident in its abilities to deliver satisfying transformations and successful project outcomes.

One of the firm’s noteworthy projects is a modern sunroom addition in Washington, D.C. The space was seamlessly integrated into the home’s existing architecture. Large windows bring in plenty of natural light. Pair that light airy feel with comfortable furniture and it’s the perfect space to relax.


  • Brooke Adams

    Brooke is a Deputy Editor at DC 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 DC Architects Education: Syracuse University, Bachelor of Science in Civil Engineering; Certificates in Public Relations and Social Media