Top-rated addition to existing structure builders.

Get matched with top addition to existing structure builders in your area

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Addition to existing structure builders in Chelsea

Avatar for Dee Construction Co., Inc.
Dee Construction Co., Inc.
P.O. Box 207
4.70(
29
)
Approved Pro
Dee Construction Co., Inc.
P.O. Box 207
4.70(
29
)
Approved Pro
Customers say: Quality work
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
51 years of experience

At Dee Construction Company my goal is 100% customer satisfaction at all times. In over 40 years of business we have had no complaints, claims, or problems we were not able to make right with any of our customers. Communication is the number one tool we use to build your addition or remodel your home. I work closely with you at every phase of your project from the design to the last nail hammered in. We understand that your time is valuable and always complete our projects on schedule. I personally have over 47 years of experience in the industry and my crew averages 30 plus. We guarantee all of our work, and give free estimates. I look forward to your call and your business. We now accept all major credit cards. .Visit us at: www.deeconstruction.net or email us @ deebuck@verizon.net If your looking for a new deck or porch, visit us at www.deckmasters.pro

"Good builder"

Richard A on June 2024

At Dee Construction Company my goal is 100% customer satisfaction at all times. In over 40 years of business we have had no complaints, claims, or problems we were not able to make right with any of our customers. Communication is the number one tool we use to build your addition or remodel your home. I work closely with you at every phase of your project from the design to the last nail hammered in. We understand that your time is valuable and always complete our projects on schedule. I personally have over 47 years of experience in the industry and my crew averages 30 plus. We guarantee all of our work, and give free estimates. I look forward to your call and your business. We now accept all major credit cards. .Visit us at: www.deeconstruction.net or email us @ deebuck@verizon.net If your looking for a new deck or porch, visit us at www.deckmasters.pro

"Good builder"

Richard A on June 2024


Avatar for REMODELING REMEDIES, LLC
REMODELING REMEDIES, LLC
112 Hartford Ave
5.00(
5
)
Approved Pro
REMODELING REMEDIES, LLC
112 Hartford Ave
5.00(
5
)
Approved Pro
Customers say: Quick response
31 years of experience
Free onsite estimate

With over 30 years of experience, Remodeling Remedies, LLC specializes in all phases of construction. Our commitment to professionalism, quality craftsmanship and competitive pricing sets us apart in the industry. We have a Small Pojects Division, which caters to all of the punch list items all homeowners have! We look forward to working with you on your project!

"We hired Rick to convert our Mudroom/entry way into a Handicapped Bathroom. The quality of work - was beyond our expectations. Rick was on site daily - kept the schedule of the project right on track for us. His communication throughout the project was so helpful and greatly appreciated. Highly recommend Rick Leland - Remodeling Remedies, LLC"

Marcia H on June 2025

With over 30 years of experience, Remodeling Remedies, LLC specializes in all phases of construction. Our commitment to professionalism, quality craftsmanship and competitive pricing sets us apart in the industry. We have a Small Pojects Division, which caters to all of the punch list items all homeowners have! We look forward to working with you on your project!

"We hired Rick to convert our Mudroom/entry way into a Handicapped Bathroom. The quality of work - was beyond our expectations. Rick was on site daily - kept the schedule of the project right on track for us. His communication throughout the project was so helpful and greatly appreciated. Highly recommend Rick Leland - Remodeling Remedies, LLC"

Marcia H on June 2025


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 A-Z Finish Carpentry, LLC
A-Z Finish Carpentry, LLC
31 Thornton Street
4.93(
7
)
Approved Pro
A-Z Finish Carpentry, LLC
31 Thornton Street
4.93(
7
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
16 local quotes requested

A-Z Finish Carpentry LLC is committed to excellence in every aspect of the business. 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. We look forward to making lasting relationships. Call us today at (954) 621-5966.

"I Hired A-Z Finish Carpentry. They were very professional, Respectful of our space, the process was very straight forward from the beginning and Charles and his crew nailed it."

Christopher M on January 2024

A-Z Finish Carpentry LLC is committed to excellence in every aspect of the business. 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. We look forward to making lasting relationships. Call us today at (954) 621-5966.

"I Hired A-Z Finish Carpentry. They were very professional, Respectful of our space, the process was very straight forward from the beginning and Charles and his crew nailed it."

Christopher M on January 2024


Avatar for Russell Remodeling and Restoration
Russell Remodeling and Restoration
169 M Street
4.95(
33
)
Approved Pro
Russell Remodeling and Restoration
169 M Street
4.95(
33
)
Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
20 local quotes requested

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 home improvement services that are customizable to each individual project. We specialize in additions and kitchen remodels, but also offer a wide range of expertise for a variety of other 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 and guarantee your satisfaction!

"The quality of the work was excellent. They cleaned up the work area every day after they worked and we are very pleased with the deck post replacement and trim board wrapping of the posts. Highly recommend and would employ them again if needed."

Chris O on June 2024

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 home improvement services that are customizable to each individual project. We specialize in additions and kitchen remodels, but also offer a wide range of expertise for a variety of other 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 and guarantee your satisfaction!

"The quality of the work was excellent. They cleaned up the work area every day after they worked and we are very pleased with the deck post replacement and trim board wrapping of the posts. Highly recommend and would employ them again if needed."

Chris O on June 2024


Avatar for M Builders, LLC
M Builders, LLC
32 School St
New on HomeAdvisorNew on Angi
Approved Pro
M Builders, LLC
32 School St
New on AngiNew 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 Angi
Approved Pro
Legacy Building Group, LLC
13 George St Apt 3
New on AngiNew 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 Angi
Approved Pro
R & J Construction
532 Water St
New on AngiNew 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.


Avatar for Baystate Group Builders, LLC
Baystate Group Builders, LLC
8 Bellingham Road
5.00(
5
)
Approved Pro
Baystate Group Builders, LLC
8 Bellingham Road
5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
23 local quotes requested

Baystate Group Builders Inc 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. 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.

"One of the best contractors I have ever worked with. Amazing attention to detail, kept us up to date on the project, and treated our money like his own."

Liz K on December 2024

Baystate Group Builders Inc 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. 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.

"One of the best contractors I have ever worked with. Amazing attention to detail, kept us up to date on the project, and treated our money like his own."

Liz K on December 2024


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

...
Showing 1-10 of 971

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

Building an in-law suite takes between two and seven months. Converting an existing basement, attic, or room can be done in about two months. Constructing a new addition or detached suite often takes four to five months for construction, plus one to two months for permits. The bigger the suite, the longer it will take. 

Yes, you can build an in-law suite in your backyard if you meet local building codes and zoning regulations. An in-law suite often occupies 300 to 800 square feet. Be sure to follow size restrictions, utility separations, and entrance requirements. Hiring a qualified contractor ensures you meet all regulatory requirements because they can pull permits, double-check local code, and gather other skilled pros to work on your suite. 

An in-law suite is a self-contained living space attached to—or detached from—your main home. Expect a bedroom, full bath, and a kitchenette or compact living area. The setup gives relatives privacy, doubles as a potential rental, and can lift your property value. To qualify as a legal dwelling, the suite must meet local building codes and zoning rules.

The Chelsea, 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.
CONTRACTOR LOOKING OVER HOME DEVELOPMENT
Apr 19, 2025
Apr 19, 2025
Budget for your general contractor’s hourly rate by considering factors such as project scope, fee structure, pricing model, and more.
Outdoor view of the modern house
Jun 16, 2025
Jun 16, 2025
Explore how square footage, room type, home additions, and other common factors affect house renovation costs with our detailed cost guide.
BRIGHT OPEN ATTIC SPACE
Jun 10, 2025
Jun 10, 2025
An in-law suite is a great solution for people who have family visiting often. Explore how much an in-law suite costs and prep to build yours.
white and gray kitchen with butchers block countertop
Apr 8, 2025
Apr 8, 2025
Looking to enhance the warmth and utility of your kitchen? Explore how much a butcher block countertop costs and start your budget here.
built-in outdoor kitchen with grill and sink
Apr 30, 2025
Apr 30, 2025
Budget for outdoor kitchen costs based on factors such as appliances, materials, permits, labor, amenities, kitchen size, customizations, and more.
BLUE TWO STORY HOME
Apr 30, 2025
Apr 30, 2025
Budget for the cost to add a second story based on factors such as size, foundation work, materials, labor, permits, post-construction cleaning, and more.
Share project details to get started.