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  • Verified reviews icon104
    Verified basement remodels reviews

Top-Rated Basement remodelers in West Islip - Updated Nov 2026

Avatar for Arthur DeRosa Building and Remodeling
Arthur DeRosa Building and Remodeling
4.7(
13
)
Basement - Remodel

Serving West Islip, 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."
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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
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Warranties offered

"Jose and his team were the best team I have ever had work on a job in my house. Jose went WAY above and beyond to make sure we had our basement back in order in a timely fashion. He was willing to work after hours if needed to help get our finished basement back after we had suffered a sewage leak and had to wait until mitigation was complete. A 3-4 day job was complete in 2 days! And one of his workers, Carlos, from the second day stuck around to help me get the heavy and large items back into the basement. There was a previous review that said Jose was very emphatic to their needs and that is so true. That review actual was what made me give Jose a call. I wish there was a word better than highly recommend. Thank you Jose and your entire team!"
Additional Photos
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+26

Response time8 hrs
22 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for BuildingLI.com - BLI Facilities LLC
BuildingLI.com - BLI Facilities LLC
5.0(
32
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"I hired Long Island handyman construction group to remodel a 400sf basement and bathroom in Melville. They were priced in the middle compared to other bids. I picked them thanks to their out of the box advice which saved me thousands of dollars. There was one problem with the plumbing which cost an extra 1800 dollars. The owner settled with me 50/50 even though it was a pre-existing issue. The project was started early and completed early. All mess was cleaned up and the crew was very friendly and fully aware. Very reputable guys and very easy to deal with. Thanks Moises and Eddy."
before demo
kitchen demolition
demolition complete
kitchen tile job in progress
kitchen tile

+172

Response time7 hrs
Recommended by76%of homeowners
Classic Home Design & Construction, LLC
5.0(
9
)
Basement - Remodel

Serving West 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 Jag Construction & Maintenance Inc.
Jag Construction & Maintenance Inc.
5.0(
23
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2020

Free estimates

Customers say: True professional

"Excellent work. We used JAG for a small bathroom remodel. Walter listened to our ideas, made great suggestions and executed the final product to perfection. We love our new bathroom and would definitely use them again for future projects."
Handymen Project
Handymen Project
Handymen Project
Handymen Project
Additional Photos

+37

4 neighbors recently requested a quote
Recommended by78%of homeowners
Avatar for Reliable Home Remodeling, LLC
Reliable Home Remodeling, LLC
4.6(
29
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Reliable Home Remodeling lives up to their name - they are reliable! They show up when they say they will - whether for an estimate or to do the work. Their estimates are concise with no surprises and their prices are reasonable. They use quality materials and their work is amazing! I will definitely use them again in the future and would recommend them without hesitation."
3 neighbors recently requested a quote
Recommended by68%of homeowners
Avatar for Homes & Beyond, Inc.
Homes & Beyond, Inc.
4.8(
20
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"

It was devine intervention that days after the storm the president of Homes and Beyond was given the wrong address to provide an estimate for a basement remediatioon job in my Rockaway neighborhood. When he knocked on my door, we struck up a conversation. I showed him my basement. He was reluctant to take a downpayment from me because I had never met him before, had no references for him, and he didn't want to spook me. Nevertheless, I had a good feeling. I gave him a deposit which he said he would not cash until I had checked out a few references. I went to the homes where he was in the process of doing work, made a few calls, and liked what I heard. He did an excellent job on the basement gutting and remediation. I then hired him to do the outdoor repairs from falling trees and to do the one floor (including new base molding, sheetrock, insulation and painting) inside my house that had water damage. He is currently in the process of renovating my basement, which includes walls (framing, sheetrocking and some cement skim-coating) floor, ceiling, insulation, etc. All of his workers must be given some kind of orientation because they are all super considerate, very neat, etc. I have no complaints and would certainly recommend Homes and Beyond.

.
"
Kitchen
Kitchen
Kitchen
Kitchen open layout
Kitchen open layout

+50

Response time6 hrs
Response rate100%
7 neighbors recently requested a quote
Avatar for Loja Renovations Fine Carpentry LLC
Loja Renovations Fine Carpentry LLC
5.0(
27
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2024

Free estimates

Small jobs welcome

"I hired Loja Renovations to assembly a number of furniture I bought online that was very difficult to put together. They came and quickly assembled them with ease. They're very skilled and efficient. Apart from the reasonable cost, I was particularly impressed with their professionalism, their show of care for the customer and their respectful attitude. I definitely plan to use them again."
Bathroom
Bathroom
Bathroom
Bathroom
Bathroom

+5

Response time1 day
Response rate100%
Avatar for DEPENDABLE RENOVATIONS LLC
DEPENDABLE RENOVATIONS LLC
5.0(
25
)
Basement - Remodel

Serving West Islip, NY and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"These guys, took a care of my home in the mist professional way. They met with me professionalism where my thoughts and concerns collided. The way they kept me updated through the whole process. I am grateful and I will absolutely use again."
3 neighbors recently requested a quote
Recommended by84%of homeowners
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Showing 1-10 of 541
Basement Remodel FAQs, answered by experts

To determine if your basement walls are suitable for finishing, assess their structural integrity and moisture conditions. Look for any signs of damage, such as cracks, bowing, or excessive moisture. Ensure proper drainage and address any underlying issues before proceeding. 

Consult with a professional if you're uncertain about the structural stability or potential risks associated with finishing your basement walls.

Basements are commonly converted into game rooms. The potential challenges you may run into include controlling moisture, working with low ceilings, limited natural light, and the need for additional electrical or HVAC work. Addressing these issues can add to the total cost, but it ensures a comfortable and functional space.

You should always use high-quality lumber for your framing in order to ensure it will last the test of time and resist moisture. Use 2-foot by 4-foot lumber that is pressure-treated for your framing.

Adding a bathroom to your basement can increase your home value since homes with multiple bathrooms sell for more. The return on investment (ROI) for a basement bathroom is 50% to 75%. The actual return varies with your home and location. Adding a half bath to your home increases the value by 2.9% while finishing a basement increases the home value by 6.6%.

When choosing materials for finishing basement walls, consider factors such as moisture resistance, durability, and fire resistance. Opt for materials specifically designed for basement environments, like moisture-resistant drywall or cement board. Insulation with vapor barriers can help regulate temperature and prevent condensation. Consider using mold-resistant paints or coatings. 

Research and consult with experts to select materials that are suitable for your specific basement conditions and intended use. Prioritize quality and compatibility to achieve long-lasting and aesthetically pleasing results.

The West Islip, NY homeowners’ guide to basement remodels

From average costs to expert advice, get all the answers you need to get your job done.