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Find Addition to existing structure builders in Winthrop

Avatar for Design Construction and Consulting Services, Inc.

Design Construction and Consulting Services, Inc.

74 Howland Street, Unit 2
4.60(
6
)
•Approved Pro

Design Construction and Consulting Services, Inc.

74 Howland Street, Unit 2
4.60(
6
)
•Approved Pro
Customers say: Quality work
35 years of experience
Free onsite estimate

Design Construction & Consulting Services (DCCS) is a Boston-based firm with over 30 years of experience in residential and commercial construction. From new builds to renovations and historic restorations, we bring hands-on expertise, personalized service, and a commitment to quality. Locally rooted and community-focused, we’ve partnered with homeowners, developers, and public agencies across the Northeast. Our skilled team delivers full-scope construction services—from foundation to finish—with the care of a small firm and the capability of a large one. We’re especially proud of our work restoring Boston’s historic homes, blending modern construction with original charm. Whether you're building new or breathing life into a century-old property, DCCS is ready to bring your vision to life.

"Cesar and his team were a pleasure to work with. I hired them to redo my kitchen and I couldn't be more satisfied with the outcome. Once the kitchen was gutted, we discovered some surprises (insufficient framing and rotten roof planks), which Cesar's team handled expertly. His men are true craftsmen and were able to resolve every issue with ease and professionalism. Cesar is very communicative and always available to discuss plans and changes. The work is superior and the finished product is stunning. I couldn't be happier and wholeheartedly recommend them."

John L on January 2021

Design Construction & Consulting Services (DCCS) is a Boston-based firm with over 30 years of experience in residential and commercial construction. From new builds to renovations and historic restorations, we bring hands-on expertise, personalized service, and a commitment to quality. Locally rooted and community-focused, we’ve partnered with homeowners, developers, and public agencies across the Northeast. Our skilled team delivers full-scope construction services—from foundation to finish—with the care of a small firm and the capability of a large one. We’re especially proud of our work restoring Boston’s historic homes, blending modern construction with original charm. Whether you're building new or breathing life into a century-old property, DCCS is ready to bring your vision to life.

"Cesar and his team were a pleasure to work with. I hired them to redo my kitchen and I couldn't be more satisfied with the outcome. Once the kitchen was gutted, we discovered some surprises (insufficient framing and rotten roof planks), which Cesar's team handled expertly. His men are true craftsmen and were able to resolve every issue with ease and professionalism. Cesar is very communicative and always available to discuss plans and changes. The work is superior and the finished product is stunning. I couldn't be happier and wholeheartedly recommend them."

John L on January 2021

Avatar for B's & D's Landscaping and Construction, LLC

B's & D's Landscaping and Construction, LLC

18 Maplewood Street, Unit 3
4.67(
3
)
•Approved Pro

B's & D's Landscaping and Construction, LLC

18 Maplewood Street, Unit 3
4.67(
3
)
•Approved Pro
Customers say: Terrific value
5 years of experience
Free onsite estimate

xx

"They showed up when they said they would and finished the job also when they said it would ."

Steven M on June 2021

xx

"They showed up when they said they would and finished the job also when they said it would ."

Steven M on June 2021

Avatar for M Builders, LLC

M Builders, LLC

32 School St
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

M Builders, LLC

32 School St
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
4 years of experience
Free onsite estimate

Our goal is to complete your project to perfection. We look forward to building long lasting relationships with the customers that we serve. We look forward to serving you. Call us today! You will not be disappointed. With 25+ years of experience in construction, Luis Matute and Rony Mendez, longtime friends, decided to put together their skills and found M Builders LLC. Luis holds a General Contractor license, Home improvement license, alongside with other licenses. He has an electrical company and has been supervising construction sites for years now. Rony Mendez, also has an Electrical License with multiple other licenses and has a Security Systems company. He has been supervising construction sites alongside with Luis for years. They have been working together for so long that they do not only consider each other business partners but also family. M Builders is coming to simplify construction for their clients in the State of Massachusetts.

Our goal is to complete your project to perfection. We look forward to building long lasting relationships with the customers that we serve. We look forward to serving you. Call us today! You will not be disappointed. With 25+ years of experience in construction, Luis Matute and Rony Mendez, longtime friends, decided to put together their skills and found M Builders LLC. Luis holds a General Contractor license, Home improvement license, alongside with other licenses. He has an electrical company and has been supervising construction sites for years now. Rony Mendez, also has an Electrical License with multiple other licenses and has a Security Systems company. He has been supervising construction sites alongside with Luis for years. They have been working together for so long that they do not only consider each other business partners but also family. M Builders is coming to simplify construction for their clients in the State of Massachusetts.

Legacy Building Group, LLC

13 George St Apt 3
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

Legacy Building Group, LLC

13 George St Apt 3
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
1 years of experience
Free onsite estimate

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

Avatar for R & J Construction

R & J Construction

532 Water St
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro

R & J Construction

532 Water St
New on HomeAdvisorNew on HomeAdvisor
•Approved Pro
4 years of experience
Free onsite estimate

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction, from the start to the completion of a project. order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction, from the start to the completion of a project. order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

KDS Development

31 Linda Avenue
4.94(
26
)
•Approved Pro

KDS Development

31 Linda Avenue
4.94(
26
)
•Approved Pro
Customers say: Quick response
31 years of experience
Free onsite estimate

Over 20 years of experience throughout Massachusetts, including Middlesex County and surrounding suburbs. Our services include: New construction, general contracting, additions kitchens, bathrooms, basements, built-in cabinetry, raised ceilings and cathedral ceilings, second story additions, entertainment center build and design, surround-sound, windows replacement old and new, roofing, dormers, all general carpentry. We are fully licensed and insured, plenty of references, free estimates.

"Small but significant weatherproofing job handled with care and knowledge equivalent to building the Brooklyn Bridge. Top notch customer care and concern."

Glenn M on February 2025

Over 20 years of experience throughout Massachusetts, including Middlesex County and surrounding suburbs. Our services include: New construction, general contracting, additions kitchens, bathrooms, basements, built-in cabinetry, raised ceilings and cathedral ceilings, second story additions, entertainment center build and design, surround-sound, windows replacement old and new, roofing, dormers, all general carpentry. We are fully licensed and insured, plenty of references, free estimates.

"Small but significant weatherproofing job handled with care and knowledge equivalent to building the Brooklyn Bridge. Top notch customer care and concern."

Glenn M on February 2025

B LAGRASSA CONSTRUCTION LLC

240 Old Main St
5.00(
1
)
•Approved Pro

B LAGRASSA CONSTRUCTION LLC

240 Old Main St
5.00(
1
)
•Approved Pro
4 years of experience
Free onsite estimate

B Lagrassa Construction is your one stop shop for all remodeling, decks and home improvement needs. We pride ourselves on quality work, fair pricing and customer satisfaction on every project...we will treat your home like our own. Give us a call today to schedule your free home estimate and ask all the questions you need answers for regarding your dream project. We are licensed and insured for your protection and look forward to adding you to our long list of happy customers!

"We hired Brennan and his company when he first started his company, years ago. We had to structurally change the living room and dining room prior to renovating the kitchen. By the end of the project we had an entire open concept first floor, and brand new kitchen. Between the workmanship, communication, dedication to show up on time, when they said they would, I would highly reccomend B LaGrassa Construction. "

Daniel C on September 2025

B Lagrassa Construction is your one stop shop for all remodeling, decks and home improvement needs. We pride ourselves on quality work, fair pricing and customer satisfaction on every project...we will treat your home like our own. Give us a call today to schedule your free home estimate and ask all the questions you need answers for regarding your dream project. We are licensed and insured for your protection and look forward to adding you to our long list of happy customers!

"We hired Brennan and his company when he first started his company, years ago. We had to structurally change the living room and dining room prior to renovating the kitchen. By the end of the project we had an entire open concept first floor, and brand new kitchen. Between the workmanship, communication, dedication to show up on time, when they said they would, I would highly reccomend B LaGrassa Construction. "

Daniel C on September 2025

Avatar for Maize Restoration & Remodeling

Maize Restoration & Remodeling

100 Russell Road
4.31(
21
)
•Approved Pro

Maize Restoration & Remodeling

100 Russell Road
4.31(
21
)
•Approved Pro
Customers say: Quality work
210 local quotes requested
15 years of experience

My name is Andrew Chase Piedra. I have been in the general contracting business for over 10 years and have worked on hundreds of projects throughout New England. Each project receives the utmost attention to detail. Whether you want a custom interior renovation, a fine historic restoration, or a simple bathroom remodeling, your job will be treated with our complete attention to every detail. I will make sure your home has the highest quality of craftsmanship from start to finish.

"Hired for a new front porch, deck and stairs. The build was solid, but found issues a month or so later. Called, and technician came out and did the needed repairs. Overall, Happy with the hire."

Lou F on July 2025

My name is Andrew Chase Piedra. I have been in the general contracting business for over 10 years and have worked on hundreds of projects throughout New England. Each project receives the utmost attention to detail. Whether you want a custom interior renovation, a fine historic restoration, or a simple bathroom remodeling, your job will be treated with our complete attention to every detail. I will make sure your home has the highest quality of craftsmanship from start to finish.

"Hired for a new front porch, deck and stairs. The build was solid, but found issues a month or so later. Called, and technician came out and did the needed repairs. Overall, Happy with the hire."

Lou F on July 2025

Coen Construction

387 Page Street, Suite 10B
4.09(
44
)
•Approved Pro

Coen Construction

387 Page Street, Suite 10B
4.09(
44
)
•Approved Pro
Customers say: True professional
132 local quotes requested
14 years of experience

We are a licensed and insured residential construction and remodeling company. Our goal is to exceed all of our clients expectations through exceptional customer service and quality craftsmanship. We work with some of the best tradesmen in the industry to deliver a quality finished product. From kitchen and bath remodels to carpentry and painting, we can do it all. Contact us for an estimate on your project today! Check out our instagram for photos and updates @coenconstruction

"The work was completed ? but if you missed something minor yet important, don?t count on getting it done afterward. Once they?ve been paid, they?ll completely ignore you, even if you?re willing to pay."

Alex K on September 2025

We are a licensed and insured residential construction and remodeling company. Our goal is to exceed all of our clients expectations through exceptional customer service and quality craftsmanship. We work with some of the best tradesmen in the industry to deliver a quality finished product. From kitchen and bath remodels to carpentry and painting, we can do it all. Contact us for an estimate on your project today! Check out our instagram for photos and updates @coenconstruction

"The work was completed ? but if you missed something minor yet important, don?t count on getting it done afterward. Once they?ve been paid, they?ll completely ignore you, even if you?re willing to pay."

Alex K on September 2025

Avatar for Modern Habitat

Modern Habitat

PO Box 582
5.00(
5
)
•Approved Pro

Modern Habitat

PO Box 582
5.00(
5
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 local quotes requested

Modern Habitat is a custom home builder and renovator offering design, general contracting and project management services .

"We added a great room, entryway, deck and second floor room to a ranch. Kip has a great design sensibility and we worked together without an architect to come up with a plan. We've been extraordinarily happy with the result; we love the house. The older section works seamlessly with the newer section. Kip pays attention to details. After the work was done, Modern Habitat has been responsive to whatever issues that arose. We are truly appreciative!"

Lisa B on November 2023

Modern Habitat is a custom home builder and renovator offering design, general contracting and project management services .

"We added a great room, entryway, deck and second floor room to a ranch. Kip has a great design sensibility and we worked together without an architect to come up with a plan. We've been extraordinarily happy with the result; we love the house. The older section works seamlessly with the newer section. Kip pays attention to details. After the work was done, Modern Habitat has been responsive to whatever issues that arose. We are truly appreciative!"

Lisa B on November 2023

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FAQs for addition to existing structure building service projects in Winthrop, MA

Yes, hidden rooms are legal, as long as they meet all local building regulations. If you sell your house, most states require homeowners to disclose full houseplans, which would include any hidden rooms.

If your secret room is a safe room, it should contain a means of communication aside from a cell phone, such as a shortwave radio. You should also have plenty of drinking water, a portable generator, emergency food supplies, blankets, pillows, flashlights, batteries and a first aid kit.

Any time you update your home’s square footage, you increase its value, but a secret room is a niche feature that doesn't rank high on every buyer’s list of must-haves. Investing your money in remodeling more common living areas like bedrooms, bathrooms, or kitchens will have a higher ROI than adding a secret room. Many secret rooms can act as entertainment spaces (think a game room or wine cellar) or quiet spaces (a library or study), so when building your secret room you may want to consider its versatility for when you’re ready to sell.

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.

See all articles
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    Explore the cost to build a bar in your home and learn how materials, wet vs. dry bars, and labor costs influence the total price of your project.