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

Avatar for Fine Designs by US Home Remodeling
Fine Designs by US Home Remodeling
5.0(
32
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2009

Free estimates

Emergency services offered

"Fine Design did a great job on our bathroom from the gutting to the finish. Dave and Lenny were easy to work with and the workers were great! Cleaned everything up each day and were very polite. The quality of the work is outstanding. Everyone was very professional and was a much more pleasant experience compared to other contractors I have used. Thanks again-I highly recommend Fine Design."
Remodeling - Kitchen & Bathroom Project
Remodeling - Kitchen & Bathroom Project
Remodeling - Kitchen & Bathroom Project
Remodeling - Kitchen & Bathroom Project
Remodeling - Kitchen & Bathroom Project

+149

Response time1 day
4 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for TAS Construction Corporation
TAS Construction Corporation
4.7(
15
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 1996

Free estimates

Warranties offered

"Anthony and his crew were friendly and professional throughout the whole project. Anthony gave us a clearly broken down estimate prior to starting the work and we were very confident in his work from start to finish. He and his crew did an excellent job and we would absolutely use him again for future projects. His prices were reasonable and comparable to other quotes we received-he provided us with a clear payment schedule over the course of the project, communicated with us every step of the way and went above and beyond to give us tips and additional info that was helpful to us as new-ish homeowners. Would absolutely recommend."
Additional Photos
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+8

Response time2 days
Response rate100%
Recommended by91%of homeowners
Avatar for BuildingLI.com - BLI Facilities LLC
BuildingLI.com - BLI Facilities LLC
5.0(
32
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Eddie was great to work with! We had a limited time frame to adhere to town inspections and Eddie and his team knew exactly what we needed and quickly got the job done. The results were great and even the inspector acknowledged the impressive repair. They were able to put a knocked out garage wall back on the foundation and repair the interior dry wall. I would recommend this company for any professional contract work due to their reasonable price, ease to work with and quality of work."
before demo
kitchen demolition
demolition complete
kitchen tile job in progress
kitchen tile

+172

Response time7 hrs
Recommended by76%of homeowners
Avatar for Homecraft Remodeling Corp.
Homecraft Remodeling Corp.
4.5(
88
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 1989

Free estimates

Warranties offered

"Norman helped us to make our Master Bathroom modern and usable. The process was easy, straightforward and relatively quick! Norman's showroom was a great meeting spot to review and talk about design, choose materials and go over any details. He was communicative and helpful in answering any and all questions throughout the process. We are thrilled with our new Master Bath that feels like we are at a hotel or spa. Thank you Norman and team. Highly recommend Homecraft!"
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+43

Response time7 hrs
Response rate100%
6 neighbors recently requested a quote
Avatar for Arthur DeRosa Building and Remodeling
Arthur DeRosa Building and Remodeling
4.7(
13
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 1986

Free estimates

Customers say: True professional

"

This is the 2nd major project I contracted Art DeRosa & Co for.  The 1st being 4 years ago a major living room/family room renovation which was hugely successful.  That 1st experience led me to award Art (after several other competitive quotes) this 2nd and far larger & more complex project.







Overall it went well but this was a complicated project encompassing all the typical trades and expertise of building a new luxury house but far more complicated because it was a renovation performed while we were living in the home. Dust partition walls with wood framing had to be erected in several locations in the house which included temporary doors for entering and egress in certain areas of the remaining living areas of the house in order to protect the remaining house from dust and demolition , as well as, provide privacy for us during construction. 

Experience, Experience, Experience and Professionalism, Professionalism, Professionalism are the hallmarks of Art DeRosa and company.  He is a seasoned performer and pretty much seen it all.  Art has such a vast amount of home construction experience in both hi-end and medium end homes that he can draw upon a wealth of knowledge in all construction disciplines to implement a fine finished result.  As a former tool and die maker his penchant for hi-precision finish work yields highest quality appearances to things like moldings; trim; windows; doors; floors; etc. etc. 

This complex renovation project lasted 7 months which was within the initial time estimate given at the beginning and Art DeRosa and team were here every single day, day in and day out,  bright and early during that time frame. He did not start any other projects and stayed on the job day-in and day-out even when other sub-contractors such as plumbers and electricians were on the job site excluding his people from doing any other work. Art DeRosa and team were here every single day until final signoff.

I would not hesitate to recommend Art DeRosa & Co for any planned New House and/or House Renovation of any kind.


"
Additional Photos
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+20

Response time2 days
4 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for All Island Additions and Renovations
All Island Additions and Renovations
5.0(
20
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"I had my second floor dormer done by All Island Additions and Renovations, and they did an amazing job. The work was clean, professional, and done the right way. I?m really happy with the results and would absolutely recommend them to anyone looking to build a dormer or renovate their home. Wil was professional , explain everything clearly, and made whole process really comfortable."
Before
After
Kitchen remodel
Bathroom remodel
Bathroom remodel

+71

Response time1 day
Response rate100%
Recommended by81%of homeowners
Classic Home Design & Construction, LLC
5.0(
9
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"Definitely I would recommend this company to do remodeling work, bathroom and kitchen. They did a tremendous job and very professional. As a homeowner, you want to hire a company that reliable, neat, detail oriented, quick and efficient. For that, I am totally satisfied."
Westbury 2021 Bath
Westbury 2021 Bath
Westbury 2021 Bath
Westbury reverse Gable remodel
Westbury 2021 Backyard

+38

Response time10 hrs
Response rate91%
4 neighbors recently requested a quote
Avatar for Powers Performance Construction LLC
Powers Performance Construction LLC
4.3(
27
)
Addition to Existing Structure - Build

Serving Old Bethpage, NY and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"They did an excellent job in our bathroom. Reasonable, professional and quality of work was amazing. I highly recommend this company. I would hire them again. Kept us informed along the way to ensure we got exactly what we wanted. Started job in time and finished in time. Amazing company and very pleasant to work with."
Decks and Porches Project
Remodeling - General Project
General Remodeling Project
Finished Carpentry and Woodworking Project
Gazebo

+53

Response time2 days
Response rate100%
4 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Old Bethpage, 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 Old Bethpage, 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.