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Find Addition to existing structure builders in Greenwich

Hill Top Remodeling, LLC

16 Unity Drive
4.68(
17
)
•Approved Pro

Hill Top Remodeling, LLC

16 Unity Drive
4.68(
17
)
•Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
12 years of experience

With over 30 years of experience in the Remodeling industry, Hill Top Remodeling, LLC is your industry expert. We pride ourselves on our extreme professionalism and attention to detail. Our customer satisfaction guarantee will assure you we will not leave your property until you are completely satisfied with our work. As a family owned and operated business you can trust that we will treat your home as we would treat our own. Give us a call today we look forward to working with you!

"If you want sloppy incomplete and incorrect work hire Hilltop. Bill did not use the products contracted for- used less expensive options without telling us - and hardly ever showed up. The job went way beyond promised finish date. Paid the full balance, Bill then left the work unfinished and ghosted us!"

T P on July 2025

With over 30 years of experience in the Remodeling industry, Hill Top Remodeling, LLC is your industry expert. We pride ourselves on our extreme professionalism and attention to detail. Our customer satisfaction guarantee will assure you we will not leave your property until you are completely satisfied with our work. As a family owned and operated business you can trust that we will treat your home as we would treat our own. Give us a call today we look forward to working with you!

"If you want sloppy incomplete and incorrect work hire Hilltop. Bill did not use the products contracted for- used less expensive options without telling us - and hardly ever showed up. The job went way beyond promised finish date. Paid the full balance, Bill then left the work unfinished and ghosted us!"

T P on July 2025

Avatar for BHI Builder & Home Improvement LLC

BHI Builder & Home Improvement LLC

194 West Avenue Apt 4
5.00(
1
)
•Approved Pro

BHI Builder & Home Improvement LLC

194 West Avenue Apt 4
5.00(
1
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Builder Home Improvement LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. 20 years of accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"They were great, quick and creative."

Gustavo x on July 2022

Builder Home Improvement LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. 20 years of accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"They were great, quick and creative."

Gustavo x on July 2022

Avatar for All Trades Contracting

All Trades Contracting

19 Oakridge Street, Unit A
5.00(
1
)
•Approved Pro

All Trades Contracting

19 Oakridge Street, Unit A
5.00(
1
)
•Approved Pro
35 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"The team helped us through one of the worst situations. Our home was severely damaged and flooded by Superstorm Sandy. We needed someone to help secure the existing structure, help oversee the insurance process and do the rebuild and remodel. We were very appreciative of the diligent work of this firm. They helped create a better design to prevent future flood risks, remodeled the house in full, and did it within our budget with insurance. In the beginning there were many nights where the team pulled all nighters."

Tracy B on June 2025

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"The team helped us through one of the worst situations. Our home was severely damaged and flooded by Superstorm Sandy. We needed someone to help secure the existing structure, help oversee the insurance process and do the rebuild and remodel. We were very appreciative of the diligent work of this firm. They helped create a better design to prevent future flood risks, remodeled the house in full, and did it within our budget with insurance. In the beginning there were many nights where the team pulled all nighters."

Tracy B on June 2025

Avatar for JR General Contractor, LLC

JR General Contractor, LLC

22 Olive Street
4.83(
15
)
•Approved Pro

JR General Contractor, LLC

22 Olive Street
4.83(
15
)
•Approved Pro
Customers say: Quick response
15 years of experience
Free onsite estimate

JR General Contractor LLC, is committed to excellence every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"Yes they did an excellent job"

Louise R on May 2025

JR General Contractor LLC, is committed to excellence every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"Yes they did an excellent job"

Louise R on May 2025

Avatar for Newfield Development Company

Newfield Development Company

201 Marshall Ridge Road
5.00(
1
)
•Approved Pro

Newfield Development Company

201 Marshall Ridge Road
5.00(
1
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
33 years of experience

We provide a full range of contracting and construction management services. Planning, pre-construction and construction services can be delivered in a variety of ways to meet the specific needs of your project. Our projects include - New Homes - Additions, large & small - Renovations - New Kitchens - New Baths - Elevator Installations - Land Development - Sub-divisions - Home Repairs - Basement De-watering

"He was honest, completely upfront and trustworthy. He kept us informed of what was happening, and overall did a great job--very happy!"

Catherine N on August 2014

We provide a full range of contracting and construction management services. Planning, pre-construction and construction services can be delivered in a variety of ways to meet the specific needs of your project. Our projects include - New Homes - Additions, large & small - Renovations - New Kitchens - New Baths - Elevator Installations - Land Development - Sub-divisions - Home Repairs - Basement De-watering

"He was honest, completely upfront and trustworthy. He kept us informed of what was happening, and overall did a great job--very happy!"

Catherine N on August 2014

Avatar for Douglas Marshall Cooper Associates, LLC

Douglas Marshall Cooper Associates, LLC

57 Westchester Avenue
4.63(
22
)
•Approved Pro

Douglas Marshall Cooper Associates, LLC

57 Westchester Avenue
4.63(
22
)
•Approved Pro
Customers say: Quick response
29 years of experience
Free onsite estimate

Douglas Marshall Cooper Associates is a full-service design and construction firm whose practice encompasses both new and existing buildings of residential and commercial use, as well as speculative housing and development. Mr. Cooper’s office is located in Pound Ridge, New York and includes a staff of himself, an associate partner, three assistants and a host of carpenters, masons, and laborers, in addition to various subcontractors that work on projects small to large. Douglas Marshall Cooper Associate's roots are based in Construction, Design, Real Estate Investment and Development & Construction Management. Our portfolio includes a wide range of work across these fields. Our uniqueness comes from understanding what it is to be the Owner, the Developer and the Builder –- a trifecta that is evident in DMC Associate's core portfolio of prestigious residential, commercial, and corporate projects. Douglas Marshall Cooper Associates, LLC...a solid track record. A powerful future.

"I wish I could give zero stars. We hired Douglas for a kitchen remodel which involved installing a kitchen island, pantry, and all the related plumbing and electrical work. The communication between Douglas and his carpenter was terrible. We submitted sketches and agreed upon the design for the cabinets which were meant to be overlaid. When the island arrived, the cabinets were inset which did not match the rest of the kitchen. In addition, the kitchen island has split and cracked at more than half of the joints. The pantry cabinet has split and areas of unpainted MDF are showing. We have needed to paint and touch up many of these spots. Regarding the plumbing, we have had multiple significant leaks from piping and tubing that the team installed. Water has leaked even through the floor and into the basement. Upon review from other plumbers, all have confirmed the parts used were cheap and of low quality, and the workmanship was subpar. After a major leak in the middle of the night, we reached out to Douglas and respectfully voiced our issues and complaints. He ignored us for a full month, and then instead of simply stopping by to take a look at the problems (which would have been the first major step to alleviating our frustrations), he responded in a despicable manner. He even included the following quote from his lawyer, He laughed saying that perhaps you lost your job (due to the CoronaVirus) and were probably scrounging for any money you could scrape up. Who would want to work with someone like this?"

Keri P on October 2020

Douglas Marshall Cooper Associates is a full-service design and construction firm whose practice encompasses both new and existing buildings of residential and commercial use, as well as speculative housing and development. Mr. Cooper’s office is located in Pound Ridge, New York and includes a staff of himself, an associate partner, three assistants and a host of carpenters, masons, and laborers, in addition to various subcontractors that work on projects small to large. Douglas Marshall Cooper Associate's roots are based in Construction, Design, Real Estate Investment and Development & Construction Management. Our portfolio includes a wide range of work across these fields. Our uniqueness comes from understanding what it is to be the Owner, the Developer and the Builder –- a trifecta that is evident in DMC Associate's core portfolio of prestigious residential, commercial, and corporate projects. Douglas Marshall Cooper Associates, LLC...a solid track record. A powerful future.

"I wish I could give zero stars. We hired Douglas for a kitchen remodel which involved installing a kitchen island, pantry, and all the related plumbing and electrical work. The communication between Douglas and his carpenter was terrible. We submitted sketches and agreed upon the design for the cabinets which were meant to be overlaid. When the island arrived, the cabinets were inset which did not match the rest of the kitchen. In addition, the kitchen island has split and cracked at more than half of the joints. The pantry cabinet has split and areas of unpainted MDF are showing. We have needed to paint and touch up many of these spots. Regarding the plumbing, we have had multiple significant leaks from piping and tubing that the team installed. Water has leaked even through the floor and into the basement. Upon review from other plumbers, all have confirmed the parts used were cheap and of low quality, and the workmanship was subpar. After a major leak in the middle of the night, we reached out to Douglas and respectfully voiced our issues and complaints. He ignored us for a full month, and then instead of simply stopping by to take a look at the problems (which would have been the first major step to alleviating our frustrations), he responded in a despicable manner. He even included the following quote from his lawyer, He laughed saying that perhaps you lost your job (due to the CoronaVirus) and were probably scrounging for any money you could scrape up. Who would want to work with someone like this?"

Keri P on October 2020

Avatar for AI Art and Design

AI Art and Design

3 AVONDALE RD
5.00(
7
)
•Approved Pro

AI Art and Design

3 AVONDALE RD
5.00(
7
)
•Approved Pro
3 years of experience
Free onsite estimate

We are a design studio with over 10 years of international experience. We'll help you hone your style, get inspired, and realize your design dreams. Beyond design we are also project managers and custom builders. This means we can deliver a project to our clients from start to finish, by streamlining the process and understanding the feasibility of each design.

"We hired Ion and AI Art and design after lengthy process with many others. He showed a high understanding of design and a sensitive. He designed and took us through the whole process with other professionals in the design and construction phases. It was a pleasure seeing everything coming together. The house looks spectacular. We highly recommend working with AI and Ion on your project. "

Michael B on July 2025

We are a design studio with over 10 years of international experience. We'll help you hone your style, get inspired, and realize your design dreams. Beyond design we are also project managers and custom builders. This means we can deliver a project to our clients from start to finish, by streamlining the process and understanding the feasibility of each design.

"We hired Ion and AI Art and design after lengthy process with many others. He showed a high understanding of design and a sensitive. He designed and took us through the whole process with other professionals in the design and construction phases. It was a pleasure seeing everything coming together. The house looks spectacular. We highly recommend working with AI and Ion on your project. "

Michael B on July 2025

Avatar for MDI Construction, LLC

MDI Construction, LLC

81 Kensett Dr
4.64(
18
)
•Approved Pro

MDI Construction, LLC

81 Kensett Dr
4.64(
18
)
•Approved Pro
Customers say: Quality work
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
13 years of experience

We are a locally owned and operated company with over 10 years of industry experience. We value honesty and integrity in all aspects of our business. We offer a variety of home improvement services that are customizable to each individual project. We specialize in carpentry work and a variety of related service and repair projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships with our clients and guarantee your satisfaction!

"Very professional, courteous, timely, knowledgeable and amazing workmanship! Very pleased with their service, plan to use them going forward for all my home upgrades."

Pam M on April 2023

We are a locally owned and operated company with over 10 years of industry experience. We value honesty and integrity in all aspects of our business. We offer a variety of home improvement services that are customizable to each individual project. We specialize in carpentry work and a variety of related service and repair projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships with our clients and guarantee your satisfaction!

"Very professional, courteous, timely, knowledgeable and amazing workmanship! Very pleased with their service, plan to use them going forward for all my home upgrades."

Pam M on April 2023

Avatar for GM Carpentry & Remodeling LLC

GM Carpentry & Remodeling LLC

10 Francis Rd
5.00(
19
)
•Approved Pro

GM Carpentry & Remodeling LLC

10 Francis Rd
5.00(
19
)
•Approved Pro
Customers say: True professional
5 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"We hired Marcelo and his team to find and fix a leak. It involved assessing the problem which he patiently did and determined the best fix which involved a window replacement. His work was professional, efficient and fairly priced. We have been using GM Carpentry and remodeling for both big and small jobs ever since. "

Pam C on April 2025

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"We hired Marcelo and his team to find and fix a leak. It involved assessing the problem which he patiently did and determined the best fix which involved a window replacement. His work was professional, efficient and fairly priced. We have been using GM Carpentry and remodeling for both big and small jobs ever since. "

Pam C on April 2025

Avatar for J A L Construction

J A L Construction

334 Exeter St
5.00(
4
)
•Approved Pro

J A L Construction

334 Exeter St
5.00(
4
)
•Approved Pro
50 years of experience
Free onsite estimate

J A L Construction has over 50 years of experience delivering high-quality construction and remodeling services. Our experience speaks for itself—we take pride in reliability, clear communication, and craftsmanship that stands the test of time. Whether you’re planning a full home addition, remodeling your kitchen or bathroom, or updating your exterior, we bring skill and dedication to every job. Our services include additions, major renovations, kitchen and bath remodels, deck and porch builds, siding installation, structural steel beam work, window replacement, and brick, stone, or paver patios and walkways. We work closely with homeowners to understand their vision and deliver results that exceed expectations. At J A L Construction, no job is too big or small. We look forward to earning your trust and helping bring your next project to life.

"The job was done in a timely manor without any issues. This was important because it is my rental unit,"

Sharon Z on August 2025

J A L Construction has over 50 years of experience delivering high-quality construction and remodeling services. Our experience speaks for itself—we take pride in reliability, clear communication, and craftsmanship that stands the test of time. Whether you’re planning a full home addition, remodeling your kitchen or bathroom, or updating your exterior, we bring skill and dedication to every job. Our services include additions, major renovations, kitchen and bath remodels, deck and porch builds, siding installation, structural steel beam work, window replacement, and brick, stone, or paver patios and walkways. We work closely with homeowners to understand their vision and deliver results that exceed expectations. At J A L Construction, no job is too big or small. We look forward to earning your trust and helping bring your next project to life.

"The job was done in a timely manor without any issues. This was important because it is my rental unit,"

Sharon Z on August 2025

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FAQs for addition to existing structure building service projects in Greenwich, CT

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 Greenwich, CT 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.