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Top-Rated Addition to existing structure builders in Northborough - Updated Nov 2026

Avatar for iCornerstone, Inc.
iCornerstone, Inc.
4.9(
58
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

In business since 1988

Customers say: True professional

"For our home addition/renovation we are very grateful to have found Richard Connolly and his site iCornerstone. Our vision was a Two-story + basement + livable attic space home addition which would provide significant practical square footage to our existing house and integrate seamlessly with it. We interviewed a number of general contractors but we were overall a bit uncomfortable after the interviews due to gaps in transparency regarding how costs were calculated and how timelines were established, resulting in some lack of confidence. We happened upon Richard’s iCornerstone site via Angies. Richard provided an extremely transparent and detailed description of his unique and practical process, which delivered a set of superb designs along with a truly logical, transparent, and honest listing of costs, both materials and labor, at all stages, and how those costs were derived. Richard also delivered transparency on timelines, and he provided recommendations for all the needed tradespeople that he had historically a close working relationship with; alternatively we could have selected tradespeople of our own choosing. Richard and his process gave us the utmost confidence for proceeding. We proceeded with our renovation under Richard’s guidance and his own crew and the entire process went according to plan with excellent communication, rapport, and confidence at all stages from excavation to final finish work. Transparency, confidence-building, dependability, highly knowledgeable, customer-friendly, and results-oriented are all terms we would use to describe Richard and the iCornerstone process. We strongly recommend Richard for anyone contemplating any home renovation or home addition, large or small."
Entertainment center
Entertainment center
Architectural details
computer room left
computer room right

+11

Response time8 hrs
Response rate100%
Recommended by91%of homeowners
Avatar for MMP Construction Inc
MMP Construction Inc
4.6(
222
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"When we started our plan of remodeling, the first thing we did was the complete roof replacement including kitchen vent & duct pipe installation to the roof, and new installation of attic ventilation. MMP did not only completed it just as agreed but also very efficiently. The crews were friendly, professional, and careful. The jobs were carefully managed and implemented effectively. I was impressed by Matt, who is the manager, and he does an outstanding job in managing the crews and the progress of the situation, and the communication was clear and always to the point. We then moved to initiate a search for a contractor of two bathrooms remodeling after completing the roof and attic vent, MMP was one of the many candidates. Matt has had not only the best idea and proposals but also shown an impressive & professional sense of evaluating the project accurately, including the possible structural modification as well as a competitive estimate of the cost of the build. His proposal included a rebuild of a wall of the bathroom to expand another one adjacent to it. Matt accepted to use my schematic design image (made with a software tool) and a spreadsheet list of the fixtures that I created - as many as fifty items including TOTO, Grohe, American Standard, Panasonic, and IKEA - to start the job (later changed some of them due to local plumbing code compliance) After beginning the bathroom remodel project, Matt shared what jobs will be done with us timely and efficiently via text so that we feel comfortable enough in knowing what is going on while living in the house of dust & noise from remodeling. The crews, Zen and Mark, were very courteous, extensively experienced, reliable, and friendly with excellent communication, sometimes with songs of 80s rock music. They ask me when more precise specifications are needed and notified me when they feel advance notifications are required. When a change is necessary due to inspection, they informed me and clarified what and why. I have never felt uncomfortable in living together with the remodel job which has lasted over four months. The completed two bathrooms were stunning, just as I imagined. Matt, Zen, and Mark have proved their strong & thoughtful expertise and lived up with my request patiently until completion. Great job. A home remodeling project cannot be successful without having a trusted partner, and my experience with MMP has led me to be glad to share my confidence that MMP has a credential to become your reliable partner to manage a construction project together."
Additional Photos
Additional Photos
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Additional Photos

+154

Recommended by89%of homeowners
Avatar for Strong Builders, LLC
Strong Builders, LLC
5.0(
54
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

In business since 1988

Free estimates

Customers say: Quick response

"Jack just completed an addition to our home, and we could not have asked for a better builder experience! He is organized and efficient, his work is excellent and the result is a wonderful addition that we are enjoying! Jack is responsive, straightforward and knowledgeable. He also built our neighbors home 6ish years ago and they love it and have not had any issues. We highly recommend working with String Builders and Jack. We plan to work with him for more house projects in the future!"
Rear Elevation
Great Room
Kitchen
Kitchen
Screened Porch

+123

Response time10 mins
Recommended by77%of homeowners
Avatar for ALVESCO CONSTRUCTION INC
ALVESCO CONSTRUCTION INC
5.0(
27
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

In business since 2013

Free estimates

Customers say: Quality work

Alvesco Construction is a locally owned, licensed and insured general contractor based in Lancaster, Massachusetts. With over 13 years of experience and more than 500 projects completed, we specialize in home additions, kitchen and bathroom remodeling, basement finishing, and whole home renovations. From planning and permits through final inspections, we coordinate skilled tradespeople and keep homeowners informed throughout the project. We prepare detailed written estimates based on your project scope and selections. Our services also include decks, siding, roofing, windows, doors, and finish carpentry. Contact us for a free estimate. English and Portuguese spoken.

Bathroom Vanity
Interior Details
Wood Stairs
Kitchen Remodeling
Reading Addition

+1

3 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Reyes Contractors LLC
Reyes Contractors LLC
5.0(
19
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"We worked with William on some structural framing reinforcement in our basement. William offered some suggested approaches, was clear in communications, and performed the work in a timely manner. Very happy to recommend!"
Remodeling - General Project
Cape Cod home remodel
Remodeling - General Project
Cape Cod home remodel
Remodeling - General Project

+28

Response time1 day
6 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Remodel Home Pro
Remodel Home Pro
4.6(
27
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

In business since 2009

Free estimates

Small jobs welcome

"Did a fantastic job doing a complete overhaul of my bathroom. Excellent communication, familiar with Somerville permitting, hired good specialty contractors. Great attention to detail, including implementing custom bathroom design. I have been recommending them to all my friends."
Response time9 hrs
18 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for TaylorMade Carpentry and Construction, LLC
TaylorMade Carpentry and Construction, LLC
5.0(
8
)
Addition to Existing Structure - Build

Serving Northborough, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Small jobs welcome

"Did excellent work! Was professional, honest, and explained how the process works. Equally as important to me is that he answered all of my questions. Admittedly, I can be overbearing in that regard, so I genuinely appreciated his patience. Highly recommended and look forward to having other projects done by him and his team when my budget allows for it again."
Response time2 days
Recommended by50%of homeowners
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FAQs for addition to existing structure building service projects in Northborough, MA

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Northborough, MA homeowners’ guide to addition to existing structure building services

From average costs to expert advice, get all the answers you need to get your job done.