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

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

Serving Wilmington, MA and surrounding areas

Approved

In business since 1988

Customers say: True professional

"My wife and I were looking to have an addition built on our 2 bedroom / 1 bath home back in the winter of 2022. After a phone conversation with Richard, we decided to have him come out to the house. He was very clear with the iCornerstone process, and the benefits of using this process. He is meticulous in measuring and understanding the existing structure. There are no guesstimates and all cost projections are based on the actual materials and labor needed to complete the work. Having such clarity regarding costs before any work begins is not something I've seen in this industry prior to this experience. It was certainly a welcome change. We now have plans for a home addition and complete control over the project. We decide the scope and can customize the plan to our budget. We are grateful to have worked with Richard, and highly recommend him!"
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 Wilmington, 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."
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+154

Recommended by89%of homeowners
Avatar for The Curtice Group
The Curtice Group
4.6(
143
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 1992

Free estimates

Warranties offered

"I had an excellent experience with The Curtice Group. I would highly recommend them and I'd use them again for a future project. We utilized the full design to build service to add a master bedroom/bath/closet, a 2nd floor 3x10 balcony, and renovate a number of items associated with the build including a re-build of an existing bathroom.  We live in an old house and Scott did a fantastic job making use of space and working with the house limitations, and overall, giving us lots of details and options as we had back/forth meetings on the concept.  The design process was great. We had a number of meetings starting from a wish list that expanded to initial design concepts and then to more final concepts. Scott made excellent use of space and gave us a lot of options which for budget reasons, we had to slowly narrow things down to a final concept. The build was equally fantastic. Not only was the quality extremely high but they stayed on schedule and never skipped days; there was always a team working every day. The workers and subs were reliable and on schedule, which you dont see too much of. Not only that but juggling/managing the schedule when the different subs had to show up was very impressive as the goals for each week were always met. Scott and his team really care to make a top-quality build. A few family members in construction walked through a few times and commented on the high quality of everything.  The house had two surprises as we things opened up.  Somewhat expected as unwelcome as it was: a bad foundation and a roof with upgrades needed. Both these items were attended to very quickly and surprisingly got back on track sooner than I thought it would.  Budget: Scott's budget was extremely accurate. Aside from the 2 house surprises (above) and the additional rise in lumber cost during COVID, all numbers and quotes lined up extremely well. Yes the cost went over the estimate but I hold no concern over this, since it was due to two extra side projects (that were impressive accomplishments). When the project was done Scott made sure we were happy with everything. A few items to touch up were quickly dealt with and Scott really went above and beyond making sure things were 100%. No negative comments from me. Any items to nit-pick are not worth putting in a review: this was an extremely positive experience and I would recommend the Curtice Group and would/will certainly utilize them again in the future."
Finished Basement & Renovated Bathroom
Kitchen Expansion & Remodel
Renovated Kitchen with Island
AFTER:
Full Kitchen renovation with island
We removed the wall separating the Kitchen and Living room we created an open floor plan.

+203

Response time2 days
Response rate100%
2 neighbors recently requested a quote
Avatar for D & R Construction
D & R Construction
4.7(
31
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

"Eric and co are the best - attentive, listen, give their professional advice, and just do a great job. The project went really well - repaired water and bug damage and fixed what was originally done in a not so great manner. Our third successful project w/ Eric and team. Very pleased"
Response time4 days
Response rate100%
Recommended by89%of homeowners
Avatar for HS General Contracting
HS General Contracting
4.8(
84
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 2007

Free estimates

Warranties offered

"Humberto is the best! He and his crew are reliable, careful, knowledgeable, and professional. They always clean up afterwards and are careful not to get paint chips (from power washing) or paint drips in the soil of my garden. I've hired him twice to paint the outside of my half of a duplex. My neighbor in the other half went in with me this time. A third neighbor who saw the work decided to have their freestanding house painted as well. A beautiful job all around. Humberto is also honest and forthright about the costs and doesn't go over."
Bathroom remodeling - Newton, MA
Wooden Outdoor Bathhouse for Backyard
Bathroom remodeling
Kitchen Remodeling
She Shed

+53

Response time11 hrs
Response rate100%
Recommended by97%of homeowners
Avatar for John R Elander & Son Inc
John R Elander & Son Inc
4.8(
19
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 1920

Free estimates

Customers say: True professional

"Rob has done just about everything for me, from building and helping to design a "ground-up" 1,000 sq-ft addition, to custom building a four-season porch, and redesigning a small bathroom, down to simple "fix-it" jobs. I can always rely on Rob to price the job fairly and honestly, have a sharp eye for detail and quality, and maintain a clean and professional working environment. He is easy to "spitball" ideas with and has often told me when an idea wasn't worth pursuing -- an admirable trait amongst construction professionals who are incentivized to keep adding work. If you appreciate an "old school" guy with subs who he and his father have known for years, then Rob is your man."
2 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Sublime Construction Corp
Sublime Construction Corp
4.9(
12
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 2010

Free estimates

Warranties offered

"Joshua called within a few minutes of my placing the request and arranged to call the next day to give me an estimate for repair of two steps at the front of our house. The quoted price was very competitive and I agreed to hire them. They came Wednesday, worked in 95 degree heat and because the steps were in such bad condition they replaced my two steps completely. My wife also asked if they would fix some cracks in our cellar walls while they were here and again we were very satisfied with the price. The work was excellent, the workers very friendly and left a clean area after they had finished. Overall excellent experience and we are already talking about hiring them for another job we will need doing soon. Very highly recommended"
project photos
Turnkey Concrete package
Turnkey Concrete package
Turnkey Concrete package
Turnkey Concrete package

+7

3 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for C P Construction and Carpentry
C P Construction and Carpentry
4.1(
47
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"CP construction and carpenrty did a great job building a new deck for my family. I was kept in the loop during the building process. Most importantly the price was right and great workmanship. I will use CP construction again and I highly recommend. Thanks again guys, from Nigel."
close up view of tile job on shower
remodel a bathroom
remodel a bathroom
remodel a bathroom
bathroom

+20

Response time2 days
2 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Quality Construction
Quality Construction
4.6(
13
)
Addition to Existing Structure - Build

Serving Wilmington, MA and surrounding areas

Approved

In business since 1992

Free estimates

Emergency services offered

"I hired Quality Construction (QC) to build a 22x24 two car garage, started from preparing the site. Turns out the site has ledge, QC worked with the foundation guy and did it very reasonable price. QC framed in garage, matched existing vinyl siding to house, iced and water shield the whole roof. QC installed garage door and garage side entrance door. QC installed gutter for the garage and also a French drain behind the garage, paved a new drive way leading to the garage. I also hired QC to build a deck between the house and the garage. Very thing comes out so beautiful excellent job. There is no issue working with QC. I really appreciate his workmanship and efficiency according to the schedule. I definitely will hire him for my future projects again. As a matter of fact, two of my neighbors have hired him for their projects."
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+35

Response time2 days
2 neighbors recently requested a quote
Recommended by92%of homeowners
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FAQs for addition to existing structure building service projects in Wilmington, 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 Wilmington, 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.