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

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

Serving Winthrop, 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 Winthrop, MA and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"We had a very small roof area need to be repaired. I sent request to multiple company to give a service quote. Few of them sent me replies and stated that they are too busy to come. Matt of MMP Consturction's contacted me promptly, scheduled an on-site visit and gave us a quote right away. The work was then scheduled and finished quickly. Matt did great job on reaching out, effective communication, and always arriving on-time. He also gave an evaluation on our roof condition. Also, Eric and Don did excellent job on finishing the project. They are all very polite, knowledgeable, and showed their professionalism. We would like to express our sincere appreciation to Matt and his crew. We are very grateful for having them arriving on-time before the winter storm to prevent potential damage of the house. From their react, we see a warm heart. No job is big or small, all jobs are equally important. Understanding the difficulties of others, for the people, been appreciated by the people. Thank you again for your high quality service. We definitively recommend MMP Construction Inc. to anyone for any related home project."
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+154

Recommended by89%of homeowners
Avatar for SILMAC Construction Inc.
SILMAC Construction Inc.
4.8(
219
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2004

Free estimates

Warranties offered

"We hired Joe and his team to build a deck on the back of our home and gut renovate our kitchen. The final products look amazing and we’re very happy with the new spaces. Joe and his team did high quality work and were very friendly. These were our first Home renovation projects and we plan to hire Joe again in the future."
Final
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+11

Response time6 hrs
1 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Neary Construction
Neary Construction
4.8(
174
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"Any construction can be stressful, but with Liam and his team I was in good hands. I had some upgrades to one bathroom and a tub to shower conversion in the master bathroom. Liam was clearly very knowledgeable, and his workmanship in both bathrooms was impeccable. He answered all my questions, had great suggestions and was very responsive whenever I needed to contact him. The demo in the master was completed in a day, and the guys cleared everything after they finished. The tile work was meticulous and just beautiful. I highly recommend Liam Neary Construction."
After a little framing is done we start closing up the walls
Another view of recess cabinet and vanity cabinet
This is the Bathroom before demo
Tiling done before final fixtures got installed
Corner shelves

+27

Response time1 day
Response rate100%
3 neighbors recently requested a quote
Avatar for Crystal Renovations LLC
Crystal Renovations LLC
4.9(
64
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"Pedro Quissanga was wonderful throughout the process. The project started out as a porch window replacement with an architect drawing plans, but once we started construction, we discovered that the whole underneath part was rotting and needed reconstruction. Pedro and his crew were hard working, reliable and careful, and his price for all of the work was very reasonable. When something went awry late in the construction, Pedro took it seriously and got people over within hours to locate the issue and fix the problem. Even though the project ended up being much more difficult than initially expected, there were never any unexpected charges and the additional work was at a consistent high level. We recommend Crystal Renovations without reservation and have several neighbors using them now for small-to-medium sized projects."
Remodeling - General Project
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+10

Response time3 days
3 neighbors recently requested a quote
Recommended by94%of homeowners
Mavridis Contracting Services
5.0(
15
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

In business since 1998

Free estimates

Warranties offered

"Our house is 50+ years old and had the original casement windows, which were starting to fail. In addition, the exterior of our house need to be painted and there were a great deal of shingles or trim that was rotted and needed to be replaced. George and his team did an outstanding job, kept us informed as they went along and completed everything on time and on budget. We couldn't be happier with how the house looks. I would highly recommend Mavridis Contratcing to anyone looking for a contractor."
Condo Reno
Condo Reno
Condo Reno
Condo Reno
Condo Reno

+73

3 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Tejada's Remodeling Inc
Tejada's Remodeling Inc
4.7(
32
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Warranties offered

"Tejada’s remodeling will go above and beyond to make sure you are happy with the services provided. They were flexible and worked around our schedule. I already have them scheduled for more work this month! They do it all! Thank you Tejada’s!!!"
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+6

Response time2 days
Response rate100%
5 neighbors recently requested a quote
Avatar for Sublime Construction Corp
Sublime Construction Corp
4.9(
12
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

In business since 2010

Free estimates

Warranties offered

"Great value, nice-clean work, Joshua was honest, reliable and started the job ahead of schedule. As a general contractor myself, I will be using these guys again. The work was brick repair, concrete, stairs, retaining walls, foundation repair. Finish product was exactly what I was looking for. Glad I found Sublime when I did. Great job guys!"
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 Winthrop, MA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"The CP construction crew were very hard working and competent. Clod as the owner is extremely customer service oriented. He communicated with me throughout the permitting process, the build and the inspection process. The new deck and stairs look great and bring compliments from all the neighbors. I will definitely reach out to CP construction in the future."
close up view of tile job on shower
remodel a bathroom
remodel a bathroom
remodel a bathroom
bathroom

+20

Response time2 days
Recommended by94%of homeowners
Avatar for Quality Construction
Quality Construction
4.6(
13
)
Addition to Existing Structure - Build

Serving Winthrop, MA and surrounding areas

Approved

In business since 1992

Free estimates

Emergency services offered

"We needed some patching done to our dining room ceiling, Phil did a great job can't tell where the repairs were made. Phil was always on time, showed up when he said he would, always cleaned up, and gave us a very fair price. Easy to recommend."
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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 Winthrop, 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 Winthrop, 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.