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

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

Serving Central Islip, 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 Arthur DeRosa Building and Remodeling
Arthur DeRosa Building and Remodeling
4.7(
13
)
Addition to Existing Structure - Build

Serving Central Islip, NY and surrounding areas

Approved

In business since 1986

Free estimates

Customers say: True professional

"Artie & Mike are simply the best. I used them to: 1) Build a LARGE extension to my house and redo my entire kitchen and dining room. The job was completed on time and on budget. Throughout the process Artie was transparent & professional. EVERY person who has stepped into my house has complimented at the detailed perfection. 3) Artie built us a custom walk in pantry 2) Built 2 large decks in the backyard as well as an outdoor shower. This project was completed on time, on budget while exceeding all expectations. If you are looking for a contractor and crew that is responsible, responsive, polite, creative and delivers the HIGHEST LEVEL of quality - Artie is the one."
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+20

Response time2 days
4 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 Central Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Warranties offered

"Excellent! Alta Renovations did my bathroom from the studs out. Tile, sheetrock, floor, vanity and the plumbing and towel hardware. The job was was in a co-op, with very frustrating "rules" and "requirements ". Most contractors would not want to participate (paperwork, time schedules and parking restrictions). Jose, the owner of Alta, abided by all the rules, whiles still keeping a smile!!! His workers worked neatly and orderly, knew exactly what had to be done, and did it. Very pleased. I'm recommending him to all my ? ? ? ? ?"
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+26

Response time8 hrs
22 neighbors recently requested a quote
Recommended by80%of homeowners
Classic Home Design & Construction, LLC
5.0(
9
)
Addition to Existing Structure - Build

Serving Central Islip, 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 A-Frame Construction LLC
A-Frame Construction LLC
4.7(
14
)
Addition to Existing Structure - Build

Serving Central Islip, NY and surrounding areas

Approved

In business since 2023

Free estimates

Small jobs welcome

"Exceptional craftsmanship. A-Frame Construction provided a very meticulous attention to detail with designing and building of our new composite deck. We look forward to working with this company again for our future home construction needs. Regards, Brian"
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 Central Islip, NY and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"I used K&A Home Repairs to rebuild my deck. I found them to be dependable, professional and experienced for what I needed. Anthony came at the appointment time to provide a fair estimate and followed the work schedule as close to the plan as He could, weather permitting. I am extremely pleased with my new deck and will be calling K&A for more projects on my home."
Remodeling
Remodeling
Remodeling
Remodeling
2 of 2
fire pit

+48

Response time11 hrs
8 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 Central Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 1987

Free estimates

Warranties offered

"Absolutely, I’d be happy to help you out with that review! Here’s a glowing one for Tri Build Construction and Ray: --- I recently had the pleasure of working with Tri Build Construction, led by Ray, and I can't say enough great things about the experience. From start to finish, the work was absolutely fantastic. Ray and his team were the epitome of professionalism: they arrived on time, communicated clearly, and maintained a clean and organized workspace every single day. Not only was the craftsmanship top-notch, but the attention to detail really stood out. They took the time to ensure everything was done exactly as we envisioned and even went above and beyond to accommodate a few last-minute tweaks we requested. The final result was everything we hoped for and more. In short, if you're looking for a reliable, skilled, and incredibly professional construction team, I highly recommend Tri Build Construction and Ray. They truly deliver a five-star experience!"
Response time1 day
4 neighbors recently requested a quote
Recommended by66%of homeowners
JMC Services Corporation
5.0(
14
)
Addition to Existing Structure - Build

Serving Central Islip, NY and surrounding areas

Approved

In business since 2022

Free estimates

Offers commercial services

"I cannot speak highly enough of the exceptional craftsmanship and professionalism displayed by Mr. Casteñeda and the employees ofJMC service corps. Their attention to detail and precision in installing the porch railing was truly impressive. Not only did they deliver outstanding results, but they also demonstrated a deep understanding of design aesthetics, seamlessly blending the railing with the overall architecture of the porch. It is evident that they take great pride in their work, and their commitment to excellence is truly commendable. I wholeheartedly recommend their services to anyone seeking top-tier contracting work."
Recommended by64%of homeowners
Avatar for Patzan Home Improvement Inc
Patzan Home Improvement Inc
5.0(
6
)
Addition to Existing Structure - Build

Serving Central Islip, NY and surrounding areas

Approved

In business since 2008

Emergency services offered

Customers say: True professional

"Giovanni and his crew were very professional and did a wonderful renovation to my garage. Any question or concerns I had were answered to my satisfaction . I would highly recommend them for any work you may have. Mike B"
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+29

5 neighbors recently requested a quote
Recommended by83%of homeowners
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FAQs for addition to existing structure building service projects in Central Islip, 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 Central Islip, 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.