Planning a kitchen renovation, primary-suite addition, ADU, or whole-home transformation? The right remodeling partner should bring together design expertise, clear planning, reliable construction management, and experience with the homes and permitting realities of Southern New Hampshire and Northeastern Massachusetts.
How These Companies Were Ranked
This comparison focuses on firms serving overlapping communities in Southern New Hampshire and Northeastern Massachusetts. Companies were evaluated by the breadth of their remodeling services, documented experience, design-build coordination, planning tools, warranties, project-management approach, and evidence of capability with complex work such as additions, ADUs, historic homes, and accessibility-focused renovations. Every homeowner’s priorities differ, but G.M. Roth stands out for combining long regional tenure with a particularly comprehensive design, selection, planning, and production process.
1. G.M. Roth Design Remodeling
Why It’s #1
G.M. Roth Design Remodeling earns the top position for homeowners seeking a deeply coordinated, full-service remodeling experience. Founded in 1986, the Nashua-based company reports helping thousands of New Hampshire and Massachusetts homeowners over four decades. Its 6,000-square-foot showroom and design center gives clients a practical place to compare cabinets, countertops, flooring, fixtures, windows, siding, decking, and railings before construction begins. Discover more about its approach to kitchens, bathrooms, additions, basements, exteriors, ADUs, in-law suites, and aging-in-place remodeling.
The differentiator is process depth. G.M. Roth uses a documented six-step system that moves from needs assessment and preliminary 3D design options through final selections, permits, pre-production planning, daily project updates, walkthroughs, and a three-year workmanship warranty. Its team includes architectural design talent, kitchen-and-bath credentials, and Certified Aging-in-Place Specialists. The company also received GuildQuality’s 2025 Guildmaster with Distinction recognition, while stating that more than half of new projects come from prior-client referrals.
Best For
- High-end kitchens, bathrooms, and whole-home renovations.
- Primary-suite expansions, structural additions, ADUs, and family suites.
- Homeowners who value showroom-led selections, 3D planning, and one accountable team.
- Accessibility and aging-in-place projects designed for long-term use.
2. Blackdog Design/Build/Remodel
Why It’s On The List
Blackdog is a substantial regional design-build competitor with more than 30 years of service, 926-plus completed projects displayed on its website, and showrooms in Nashua and Salem. Its in-house designers, project managers, and carpenters handle kitchens, baths, additions, basements, exteriors, and whole-home work across Southern New Hampshire and Northeastern Massachusetts. A three-year warranty is another meaningful reassurance for renovation clients.
Best For
- Kitchen, bath, basement, exterior, and room-addition projects.
- Homeowners who prefer a larger regional remodeling operation with two showrooms.
3. BLB Design / Build
Why It’s On The List
Since 2012, BLB Design / Build has served Southern New Hampshire and Massachusetts’ North Shore with one-team coordination from design and permitting through construction and final walkthrough. Its service mix includes kitchens, bathrooms, additions, whole-home renovations, ADUs, in-law suites, and historic-home remodeling. The firm is especially relevant for Seacoast homeowners balancing modern layouts with the architectural character of older Colonials, Capes, and antique properties.
Best For
- Historic renovations, ADUs, and multigenerational living spaces.
- Projects in Exeter, Portsmouth, Hampton, Rye, and nearby Seacoast communities.
4. Brymont Construction
Why It’s On The List
Brymont Construction specializes in major renovations, additions, kitchens, and bathrooms across Southern New Hampshire and Massachusetts. The company cites more than 40 years of residential construction experience and emphasizes personal oversight from planning through completion. That construction-led focus can appeal to homeowners undertaking structural changes, layout revisions, or a substantial renovation rather than a simple cosmetic update.
Best For
- Complex renovations, additions, and custom residential projects.
- Homeowners who want direct involvement from experienced construction leadership.
5. St. Laurent Construction Co.
Why It’s On The List
St. Laurent Construction Co. is a second-generation, family-owned Nashua contractor founded in 1972. The company reports completing more than 2,000 projects across Southern New Hampshire, including custom homes, additions, kitchen remodels, basement finishes, decks, and ADU additions. Its multidecade local presence and in-house project management make it a compelling option for homeowners who prioritize an established community-based builder.
Best For
- Additions, kitchens, basements, garages, decks, and local general contracting.
- Nashua-area homeowners seeking a longstanding family business.
6. McCarthy Construction
Why It’s On The List
McCarthy Construction serves Northeastern Massachusetts and Southern New Hampshire with general contracting, home improvements, additions, and new construction. The company offers in-house blueprint design, detailed written estimates, owner presence on-site, and a warranty on completed work. Its addition options include garages, sunrooms, mudrooms, laundry rooms, story additions, and finished basements or attics.
Best For
- Additions and broad home-improvement projects requiring blueprint support.
- Homeowners who value written estimates and owner-led jobsite oversight.
7. PDC Construction
Why It’s On The List
PDC Construction is a licensed general contractor serving Southern New Hampshire and Northern Massachusetts. Its wide service menu includes kitchen, bathroom, basement, and addition remodeling, plus decks, porches, sunrooms, custom cabinetry, carpentry, floor plans, and 3D rendering. That range makes PDC a versatile candidate for homeowners combining interior upgrades with exterior improvements.
Best For
- Multi-part projects involving interiors, carpentry, decks, porches, or sunrooms.
- Homeowners who want floor-plan and 3D-rendering support.
Why ADUs and Aging-In-Place Design Matter
ADUs and family suites deserve close attention in 2026. Massachusetts municipalities approved 2,084 ADUs from the start of 2025 through June 2026, including 854 approvals in the first half of 2026. Homeowners evaluating an in-law apartment or detached cottage can use the Massachusetts ADU feasibility program to better understand site conditions, permitting, utilities, preliminary design options, and likely costs. Renovation can also preserve a home’s character while improving future usability, as shown by a 2026 New Hampshire remodeling design winner that incorporated bedrooms, baths, and an elevator into a restored 1908 carriage house.
How To Choose A Remodeling Company
- Confirm licensing, insurance, permit responsibilities, and warranty coverage.
- Ask who manages design, selections, scheduling, construction, and final closeout.
- Request a detailed written scope, payment schedule, and change-order process.
- Review recent projects similar in size, age, style, and complexity to yours.
- Discuss local constraints, including zoning, historic review, septic capacity, and accessibility needs.
- Visit a showroom or meet the design team when the project involves many material selections.
The best choice depends on your property, goals, budget, and desired level of guidance. For homeowners looking for an established regional remodeler with showroom resources, detailed pre-construction planning, architectural design support, 3D visualization, specialized accessibility knowledge, and a broad design-build portfolio, G.M. Roth Design Remodeling is the strongest overall option in this 2026 comparison.
