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

Avatar for BuildingLI.com - BLI Facilities LLC
BuildingLI.com - BLI Facilities LLC
5.0(
32
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Hector and Moises were excellent! Hector came with one other of their crew and assembled my permanent gazebo. I have stone pavers and they were very careful in cutting them and digging Deep enough to establish a good anchor. They even installed railings for my back stoop. I would highly recommend them! Clean... affordable and professional."
before demo
kitchen demolition
demolition complete
kitchen tile job in progress
kitchen tile

+172

Response time7 hrs
Recommended by76%of homeowners
Avatar for Arthur DeRosa Building and Remodeling
Arthur DeRosa Building and Remodeling
4.7(
13
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 1986

Free estimates

Customers say: True professional

"Arthur gave us a fair and competitive estimate and was able to start work quickly thereafter. He and his team did an excellent job gutting and totally remodeling two bathrooms and a closet as well as redoing some of the wood flooring, moving vents, and moving hallways. Arthur himself was at the home everyday and did the important work himself. He also went the extra mile in helping us with small projects around the major project as they came up. He was extremely responsive in provided us with timely updates. When complications occurred (due to the house having not been renovated in 40 years) he was clear and helpful in keeping the project on schedule. He was extremely honest and I trusted him to be alone in my house for weeks on end with his team. I would/plan to work with Arthur again in the future for my home renovation projects."
Additional Photos
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Additional Photos
Additional Photos
Additional Photos

+20

Response time2 days
3 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Alta Renovations Corp
Alta Renovations Corp
5.0(
30
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Warranties offered

"Jose and his crew did an outstanding job on our extensive interior and exterior renovation, which included a new addition. The project covered everything from a new structural roof with shingles and skylights to new construction windows and doors, siding, a Trex deck, and fully renovated kitchen, bathroom, and laundry room. They also refinished a bedroom and installed beautiful hardwood floors. As with any large project, a few unexpected challenges came up, but Jose handled them with professionalism and kept everything moving forward smoothly. His craftsmanship is excellent, and he’s not only easy to work with but also patient and highly skilled at problem-solving. I wouldn’t hesitate to hire Jose again for future projects and highly recommend him to anyone looking for quality work and a reliable contractor."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+26

Response time8 hrs
19 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Homes & Beyond, Inc.
Homes & Beyond, Inc.
4.8(
20
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Highly highly recommend Homes & Beyond….Miguel is a true professional from start to finish, communication was at 100% all the way throughout the project, I’ll be hiring them for other projects I have….and cannot say enough about his crew, polite, knowledgeable and kept my home so clean after every day til end of project!!!….they totally exceeded my expectations!!!!"
Kitchen
Kitchen
Kitchen
Kitchen open layout
Kitchen open layout

+50

Response time6 hrs
Response rate100%
7 neighbors recently requested a quote
Avatar for A-Frame Construction LLC
A-Frame Construction LLC
4.7(
14
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2023

Free estimates

Small jobs welcome

"A Frame (Billy) responded immediately to my requests and took careful measurements I needed a new screen door plus platform/landing and staircase to an existing deck. Excellent workmanship !!!! Cleanup was done thoroughly Would hire again and highly recommend this company. Thanks for a job well done"
Hampton Bays Interior job
Hampton Bays Interior job
Hampton Bays Interior job
Hampton Bays Interior job
Medford Deck

+112

Response time4 hrs
Response rate100%
10 neighbors recently requested a quote
Avatar for A.S.M. Home Improvements
A.S.M. Home Improvements
5.0(
12
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"Anthony is the consummate professional. He worked with us to design a porch that not only looks outstanding but adds curb appeal and value to our home we never could have imagined. He is efficient, neat, completely open to last minute "hey we forgot but could you...", incredibly excellent at everything he does (he's also done for us internal painting, fixed floor planks etc) and most important is that he is just the nicest person with whom to work on home projects. Highly recommend."
Remodeling
Remodeling
Remodeling
Remodeling
2 of 2
fire pit

+48

Response time11 hrs
5 neighbors recently requested a quote
Recommended by58%of homeowners
Avatar for Tri Build Construction
Tri Build Construction
4.2(
40
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

Super Service Award Winner

In business since 1987

Free estimates

Warranties offered

"I am incredibly thankful to Ray LaManna and Tri Build Construction for my new roof. I had major structural damage to my roof due to improperly installed solar panels. Not only did Tri Build diagnose the leaks before the repair, they fixed it in record time. It was extremely reassuring to know what the cause was and how it would be resolved so that I would not have to worry about my home, my greatest investment. If you have roof damage due to improperly installed solar panels, or if you’re looking for a new roof and need a competent and honest contractor, you need Tri Build Construction, a U.S. Veteran owned company."
Response time1 day
5 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Patzan Home Improvement Inc
Patzan Home Improvement Inc
5.0(
6
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2008

Emergency services offered

Customers say: True professional

"We are very happy and satisfied with the projects completed by Patzan at our home. Mr. Patzan is very professional, knowledgeable and pays great attention to detail to deliver a good durable, functional and great look looking finish at a decent price. Mr. Patzan Communication is excellent and he answers all my questions. We did two projects with Patzan and we are planning my our next one with Patzan. I really recommend this company."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+29

3 neighbors recently requested a quote
Recommended by83%of homeowners
JKL Construction, Inc.
4.2(
21
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2010

Free estimates

Customers say: Quick response

"I had a new porch built and working with Ken and co, and they were outstanding from start to finish. The crew showed up when they said they would, kept the workspace clean, and treated my home with real care. They walked me through choices, gave clear timelines, and delivered exactly what they promised. The craftsmanship is solid and the porch has already become our favorite spot at the house. What stood out most was how easy they made the whole process. No surprises, no pressure, just steady communication and thoughtful work. I’d recommend them without hesitation to anyone looking for reliable, high-quality construction."
Response time9 hrs
Response rate89%
19 neighbors recently requested a quote
Concorde Remodeling, Inc.
4.2(
48
)
Addition to Existing Structure - Build

Serving Centereach, NY and surrounding areas

Approved

In business since 2008

Free estimates

Customers say: Quick response

"5 years ago I put an addition to my house, a relatively large job. I was very pleased with the work Bob's People did. So when I recently decided to remodel my kitchen I didn't hesitate to hire bob again. And once more very pleased ."
New addition
New addition
New addition
Working
New addition

+14

Response time1 day
Response rate100%
Recommended by92%of homeowners
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FAQs for addition to existing structure building service projects in Centereach, NY

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 Centereach, NY 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.