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

Avatar for Arthur DeRosa Building and Remodeling
Arthur DeRosa Building and Remodeling
4.7(
13
)
Addition to Existing Structure - Build

Serving Coram, 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 Coram, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Warranties offered

"My husband and I are so happy with our new deck. Just in time for the beautiful weather! We have Jose Diaz with Alta renovations corp. to thank for making our home improvement job stress free. He and his crew were extremely prompt, meticulous, courteous and great communicators. Jose made me feel comfortable asking questions and was prompt to respond. It was truly an absolute pleasure working with them from the start to the finish !"
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+26

Response time8 hrs
22 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for A.S.M. Home Improvements
A.S.M. Home Improvements
5.0(
12
)
Addition to Existing Structure - Build

Serving Coram, 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 Patzan Home Improvement Inc
Patzan Home Improvement Inc
5.0(
6
)
Addition to Existing Structure - Build

Serving Coram, 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
JKL Construction, Inc.
4.2(
21
)
Addition to Existing Structure - Build

Serving Coram, NY and surrounding areas

Approved

In business since 2010

Free estimates

Customers say: Quick response

"Kenneth was amazing to say the least! From the moment we first sat down with him for an estimate, he was professional, polite, & extremely knowledgeable, all the way until the completion of the job. We explained to him that we wanted to update our old kitchen & he offered great suggestions of how we could improve & better maximize our space such as taking down the wall separating the kitchen from living room to create an open concept & allow better air flow through the house, move the back door from the right side to the left to get the best use of the longer wall & allowing for more counter space, & suggesting putting in a toe-kick heater to warm the floor when I expressed how my feet are freezing during the winter. He returned w/ a computer model of what our new kitchen would look like & checked in w/us throughout the build. We were so impressed w/our new kitchen/living room that we also hired him to build our deck & remodel the front of our house so check out those pics too! ???"
Response time9 hrs
Response rate89%
16 neighbors recently requested a quote
Avatar for Adelbin Construction LLC
Adelbin Construction LLC
5.0(
3
)
Addition to Existing Structure - Build

Serving Coram, NY and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"I hired Adelbin Construction for an extension on my home to create and add extra space in my family home. They did a fantastic job, on schedule and was able to come in under budget. They took care of everything from sourcing materials that I had requested to taking care of all permits with the town. 10/10 service. I will most definitely be using Adelbin in the future."
Fire Restoration
Fire Restoration
Fire Restoration
Fire Restoration
Fire Restoration

+17

Response time7 hrs
Response rate100%
8 neighbors recently requested a quote
MGT Construction, Corp.
4.1(
17
)
Addition to Existing Structure - Build

Serving Coram, NY and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"The construction company, MGT Construction has just completed our +/-600 sq foot deck at our home in Southold. MGT managed the planning: We were determined to build the deck per Southold Town code using Timber-Tech composite decking and railings per their specifications. After we had the survey done Steven coordinated with their architect and liaised all building inspections. He was instrumental in all follow-ups with the town until final approval of the permit. We sourced the pressure-treated framing lumber from Amagansett Lumber and with four feet deep footings the underlying structure is solid and constructed to last 30 years, which is also the guaranteed life of the decking. MGT Construction excels in the carpentry aspect of the decking. They made sure the planks were correctly aligned and the surrounding picture frame planks were precisely fitted. This was also true as well regarding the fitting of the railings. We opted for “drink rails” and their finishing on those is superb. Our overall impression of the construction staff was that they were always courteous and friendly. We did however make the observation that the workers should pay attention to their attire, which at times was needlessly sloppy and awkward. However, they were hard workers and respectful. An electrical subcontractor had to redo work because a supervisor was not on the site. The work was corrected and promptly made without complaint. Cleanup was done in a timely manner and to our satisfaction. Having had other construction work done on homes I can honestly say, MGT Carpentry was professional and their work was excellent. I highly recommend them."
Greenport Second Floor Addition
Orient Complete Ground up House
Greenport Complete Ground Up House
Kitchen Remodeling Project
Orient Complete House Build - Bathrooms

+172

Response time1 day
3 neighbors recently requested a quote
Recommended by75%of homeowners
CHELSEA HOME REMODELING INC
5.0(
1
)
Addition to Existing Structure - Build

Serving Coram, NY and surrounding areas

Approved

In business since 1986

Free estimates

Emergency services offered

"The installers arrived on time, were immaculate and the tile job was perfect. The slab was uneven but they somehow managed to pit in a perfectly level floor. The employees are very pleasant and professional. They came highly recommended by Cancos Tile, which is how I found them."
11 neighbors recently requested a quote
Recommended by100%of homeowners
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FAQs for addition to existing structure building service projects in Coram, 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 Coram, 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.