Award-Winning High-End Home Additions

Expand Your Living Space. Elevate Your Home. Honor Your Investment.

As your family grows and your needs evolve, your home should adapt with you. Expanding your living footprint shouldn’t mean compromising on architectural integrity or leaving the Nashua neighborhood you love. Whether you envision a sweeping main-floor primary suite, a sunlit custom kitchen expansion, or a complete second-story addition, G.M. Roth Design Remodeling delivers seamless, high-end home expansions tailored to your lifestyle.

Serving Nashua and Southern New Hampshire for over 30 years, our master team turns ambitious structural visions into timeless, award-winning realities.

Award-Winning Luxury Home Addition Contractors

For three decades, G.M. Roth Design Remodeling has set the benchmark for home addition contractors in Southern New Hampshire. We believe a successful room extension shouldn’t look like an afterthought—it must integrate flawlessly with your home’s existing architecture, rooflines, and exterior finishes.

As proud recipients of dozens of industry accolades, including prestigious Cornerstone Awards and GuildMaster Awards, we have built our reputation on superior engineering, uncompromising material selection, and an exceptional client experience. Over half of our new projects come directly from client referrals—a testament to our Customer Pledge:

Superior Craftsmanship: We construct every home addition using premium, durable materials engineered to withstand New England’s harsh seasonal freeze-thaw cycles and heavy snow loads.
Transparent & Honest Communication: You receive detailed specifications, fair pricing, and clear timelines upfront—no hidden costs or diagnostic games.
Respect for Your Property: Our crew treats your property with care, maintaining clean, organized job sites to minimize daily life disruption.
Industry-Leading Warranties: Every product and structural element we install is backed by robust warranties and installed by licensed, factory-trained master builders.

Explore Our Home Additions Gallery

Plan Now, Build in 2027 Perfect for Additions, ADU's, Decks, and Whole Home Remodels

Types of Luxury Home Additions We Build

Every family’s spatial needs are unique. As trusted room addition contractors, we design and construct luxury custom home additions tailored to your home’s existing footprint and long-term goals:

Second-Story Additions

When lot coverage restrictions, setbacks, or tight property lines prevent you from building outward, building up is the ultimate solution. A second-story addition can double your usable square footage without sacrificing an inch of your yard, driveway, or outdoor living space.

Primary Suites & Retreats: Create an expanded luxury wing featuring custom walk-in closets, spa-like primary bathrooms, and private balconies.
Family Bedrooms & Baths: Add dedicated bedrooms and bathrooms to accommodate growing families or multi-generational living.
Structural Engineering & Load-Bearing Mastery: Our expert structural team evaluates your existing foundation, joists, and framing to ensure total safety, seamless integration, and full load-bearing compliance.

Custom Kitchen Additions

The kitchen is the heart of the home, but older Southern New Hampshire floor plans often lack the square footage modern life demands. We expand your home’s footprint to accommodate gourmet cooking layouts, expansive prep islands, walk-in pantries, and sunlit breakfast nooks.

Luxury Bathroom & Spa Additions

Transform crowded routines into a private sanctuary. We construct custom bathroom additions complete with zero-threshold curbless showers, freestanding soaking tubs, radiant heated tile floors, and high-end double vanities.

Sunrooms, Decks, & Porches

Bring the outdoors in with custom four-season sunrooms, covered porches, and structural composite decks built to handle New England weather while maximizing year-round natural light.

Discuss Your Addition Project With an Expert

Accessory Dwelling Units (ADUs) vs. Home Additions: Which Is Right for You?

When planning to add space to your property in Nashua, choosing between an Accessory Dwelling Unit (ADU)—whether attached or detached—and a standard home addition depends on how you plan to use the space, local municipal zoning rules, and your long-term goals.

Feature / Goal	Custom Home Addition	Accessory Dwelling Unit (ADU)
Primary Focus	Expanding primary living space (kitchens, primary suites, family rooms).	Creating fully independent, autonomous living quarters on the same lot.
Key Amenities	Integrated directly into existing floor plan flow; shares main house utilities.	Includes dedicated kitchen/kitchenette, full bath, living area, and private exterior entrance.
Best Used For	Extra bedroom space, entertaining areas, enlarged kitchens, or second-story expansions.	Aging parents (aging-in-place), returning adult children, or long-term rental income opportunities.
Property Impact	Maximizes main home resale value, square footage, and overall livability.	Increases total property functionality, offers independent living separation, and boosts property utility.

Whether you need a quiet in-law suite with complete privacy or an open-concept main floor room extension, our team guides you through Nashua’s local zoning laws, setback requirements, and permitting processes.

Schedule an ADU vs. Addition Feasibility Audit

Our Streamlined Design/Build Advantage

Traditional remodeling often forces homeowners to act as the middleman between separate architects, structural engineers, and home additions builders. At G.M. Roth Design Remodeling, our integrated design/build approach puts every discipline under one roof with a single point of contact.

In-Home Design ConsultationWe meet at your home to evaluate your current space, review architectural possibilities, and discuss your lifestyle vision.
Detailed 3D Modeling & SpecsVisualize your second-story expansion or luxury room addition before construction begins. You see exact material finishes, layouts, and transparent pricing.
Dedicated Project ManagementYou are assigned a dedicated project manager who oversees structural engineering, site prep, framing, plumbing, electrical, and interior finishes.
Prompt, Efficient ServiceWe respect your timeline and understand that home construction disrupts daily life. Our expert crews complete your project efficiently without sacrificing quality or attention to detail.

Experience Design/Build — Call (603) 634-9616

Benefits of a Luxury Home Addition

Investing in a custom home expansion with G.M. Roth Design Remodeling delivers long-term lifestyle and financial rewards:

Increase Usable Square Footage: Gain the exact room you need for living, working, or hosting without sacrificing comfort.
House Guests & Family Comfortably: Create dedicated suites for visiting guests, extended family, or multi-generational living arrangements.
Boost Home Value: Expand your house’s market appraisal value and curb appeal with seamless, high-end architectural craftsmanship.
Skip the Hassle of Moving: Save on the massive expenses, closing costs, high interest rates, and stress associated with selling your home and relocating.

Call Our Team (603) 634-9616

Frequently Asked Questions About Home Additions in Nashua, NH

How long does a luxury home addition or second-story expansion take?

Timelines vary based on scale and structural complexity. Typically, the architectural design, engineering, and municipal permitting phase takes 6 to 10 weeks. Physical construction for a major custom room addition or second-story expansion generally ranges from 3 to 6 months. During your initial consultation, we provide a detailed project schedule so you know exactly what to expect at every phase.

Will a second-story addition require us to move out during construction?

For major second-story additions where the existing roof structure is temporarily removed and upper-level utility connections are established, living off-site during the framing and weatherproofing phase is often recommended for safety and comfort. For main-floor room additions or ADUs, we erect containment and dust barriers that allow you to stay comfortably in your home throughout the build.

How do you match the exterior of an addition to an older New Hampshire home?

Achieving a seamless transition is our specialty. We carefully source matching siding, custom masonry, stone veneers, roofing materials, and architectural millwork that honor your home’s existing style—ensuring the new structure looks like an original part of the house.

Ready to Get Started on Your Home Addition?

Connect with G.M. Roth Design Remodeling today instead of trading the neighborhood and home you love for the hassle, closing costs, and moving expenses. Let our design/build team build the custom space your family deserves.

Request Your In-Home Consultation

Call Our Design Team Today: (603) 634-9616

Alan Cohen

I am a returning customer who recently needed a wall and ceiling repair due to water damage, and a bathroom remodel. My experience was j7ust as good as it was many years ago - with everyone and everything. Our leads were Kris and Liam - both excellent at their work and very approachable. They took great pride in doing an excellent job. Everyone that came to our house was did at good job, very gracious and always cleaned up. Forgive me for not remembering everyone: John, Dominic, Sabeno, Matt, ?. They were great. On the phone, Scott, Diane and Theresa were very helpful and were genuinely hapy to engage with us. The first person that I had contact with Justin.He represented the company. We talked about the job over the phone. That was followed by a thorough meeting on-site to understand exactly what we wanted and how best to move forward. We met with justin three additional times, once at the shjowroom to pick out products and twice at our house.His job was sales, but he treated the project as if it was important to GM Roth, and to him personally, and more importantly he treated us like valuable customers. The first person that you meet in any organization sets the tone and establishes expectations. We had confidence that the project would turn out well and we could rely on everyone to make sure of it. we were very pleased with the outcome and would not hesitate to recommend GM Roth or to call upon you again.

Kerri Figueroa

We couldn’t be more pleased to have chosen G.M. Roth to help us renovate and refresh our outdated primary bathroom. They did high quality work, at a fair price, on schedule and they even offer a warranty on their work. Their thorough process ensured that our selections were ordered and on-site, ready to go, and their well-planned schedule made for a seamless construction process with no surprises. We thoroughly enjoyed working with Anne on the design process! She made the process enjoyable and her expertise was invaluable. She was very accommodating, often meeting us at vendors to help narrow selections and/or scheduling design meetings around our busy schedules. She was super helpful in guiding us towards more cost-effective options to achieve the same design aesthetic whenever possible. Liam and Matt ensured that all of the subcontractors understood the schedule and the job. They provided timely updates via the construction app and answered all of our questions/concerns, resolving any minor issues quickly and efficiently. All of the subcontractors were skilled craftsman, very pleasant to work with and extremely professional, arriving on time, working efficiently and cleaning up after themselves each day. Perhaps most importantly, we were thrilled with the quality of the work throughout and how the finished product came together beautifully. We now have a gorgeous spa-like retreat that we use and enjoy every single day!

Dianne Devito

As homeowners our connection to G.M.Roth Design Remodeling began in 1992 and ever since we have returned to them (most recently, this Fall of 2024)for our home improvement needs. For us, as homeowners G.M. Roth gives us a peace of mind that comes with knowing we were working with a team of professionals who prioritize our satisfaction. G.M. Roth listened to our ideas, preferences, and/or our concerns. In return, G.M Roth provided thoughtful feedback while outlining the construction process. Their excellent communication skills made it easy for us to stay informed about the progress of the project. Throughout the construction process, the professionalism displayed by everyone on the team was exceptional! Our experiences with G.M.Roth has been and IS very positive! Their long-standing reputation in the home remodeling industry is well-deserved and we wouldn’t hesitate to recommend them to anyone seeking dependable , professional and high-quality home remodeling/construction services.

Jay Nannicelli

When we first contacted G.M. Roth we were envisioning a complete replacement of of the front door and entryway to our home. After discussion and review of the problem we were trying to solve, Roth was able to recommend a less costly solution. The two carpenters assigned to the job were professional, took care to protect our property and completed the repairs efficiently and on time. Wew are very pleased with the outcome and our experience with G.M. Roth.

Cathy Waters

GM Roth completed our third project in ten years this summer, so we are very confident in recommending them. They have redone three bathrooms, one kitchen, and in our latest project, an assortment of things that improved our new home. They are meticulous in their planning and their people are nice, trustworthy, and competent. We had to wait a few months for the job to start, but once they got going, they made regular progress. If there was a hangup, they explained what was causing it. We have to drive further than is convenient to meet them in their showroom, so the fact that we are willing to go the extra miles is proof that we appreciate their work!

Bill Fitzgerald

Couldn’t be more pleased with our experience with G.M. Roth Design Remodeling. We upgraded to a walk in shower. Every employee at G.M. Roth was very professional and clear from the beginning to completion. Matt was the on-site supervisor and kept us updated every step of the way. Work area was cleaned every day. Questions were answered clearly & succinctly. The new shower is beautiful. If you want a first class installation then G.M. Roth is who you want. We plan on having more work to be done by G.M. Roth.

kathy

Many of us have a goal to age in place. GM Roth help us make sure that goal became a reality. Our new bathroom now provides my husband, who has mobility issues, with confidence that he will stay safe while showering. The entire GM Roth process is very transparent and the communication between the team members and myself was great. We are very pleased with the final project outcome and appreciate everyone's patience and assistance while we made our final decisions.

Award-Winning High-End Home Additions

Award-Winning Luxury Home Addition Contractors