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Find Basement remodelers in Central Islip

Avatar for A.S.M. Home Improvements
A.S.M. Home Improvements
5.0(
10
)

Serving Central Islip, NY and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"The bathroom remodel was done beautifully. Anthony & his crew were very professional. Arrived on time everyday & put in a full day. I noticed he even was concerned about making sure everything was clean when leaving each day. His price was reasonable & we are going hire him again."
Remodeling
Remodeling
Remodeling
Remodeling
2 of 2
fire pit

+48

Response time11 hrs
5 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for JBL HOME IMPROVEMENTS INC
JBL HOME IMPROVEMENTS INC
4.9(
227
)

Serving Central Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Warranties offered

"I cannot say enough about these guys. Their prices were reasonable and about average compared to other companies. The owner, Dave was great to work with, he kept us updated on a daily basis, and was there every morning to look things over and help get the guys set up. The workers were there at 7 am every day. Work was done well within the given timeframe. Everything was left clean each day. They built a bedroom in our basement, and gutted and remodeled a bathroom, we couldn’t be happier with both projects. Very professional, highly recommend."
Additional Photos
Additional Photos
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Additional Photos
Additional Photos

+23

Response time1 day
Response rate89%
11 neighbors recently requested a quote
Avatar for Northgate Home Improvement Corp.
Northgate Home Improvement Corp.
5.0(
83
)

Serving Central Islip, NY and surrounding areas

Approved

In business since 1985

Free estimates

Warranties offered

"Jeff did a great job on our complete basement bathroom remodel last December so we asked him to do a small job of installing a vanity. The job was done quickly and efficiently. The price was reasonable. Everything was cleaned up. I highly recommend Northgate Home Improvement and will gladly hire them in the future."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+56

Response time7 hrs
7 neighbors recently requested a quote
Recommended by98%of homeowners
Avatar for BuildingLI.com - BLI Facilities LLC
BuildingLI.com - BLI Facilities LLC
5.0(
21
)

Serving Central 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

+159

Response time7 hrs
Recommended by90%of homeowners
Avatar for Alta Renovations Corp
Alta Renovations Corp
5.0(
24
)

Serving Central Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Warranties offered

"Would definitely recommend Alta Renovations Corp, they are so professional and I am completely satisfied with their work! I would definitely use them again for any home remodeling!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+26

Response time8 hrs
7 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Refined Renovators & Design
Refined Renovators & Design
5.0(
8
)

Serving Central Islip, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Emergency services offered

"Basement looks great , better then we ever expected .. the workers were on time and very respectful.. I would definitely recommend .. we will be using this company in the future for our next remodel."
comfortable spaces
sunroom
Beautiful Bathroom
Primary Bedroom
custom cabinets

+8

Response time5 hrs
Response rate93%
18 neighbors recently requested a quote
Avatar for Loja Renovations Fine Carpentry LLC
Loja Renovations Fine Carpentry LLC
5.0(
22
)

Serving Central Islip, NY and surrounding areas

Approved

In business since 2024

Free estimates

Small jobs welcome

"I was very pleased and satisfied with the work that Loja Renovation provided. They replaced and installed a medicine cabinet by removing old tiles and replaced with new tiles to accommodate the new one. Patched a wall where a bathroom cabinet was removed. And replaced a tub spout with a new one. I would hire the again and recommend them to others. "
Bathroom
Bathroom
Bathroom
Bathroom
Bathroom

+5

Response time1 day
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Showing 1-10 of 1773
FAQs for basement remodeling projects in Central Islip, NY

Finishing a basement turns unused square footage into livable space and returns up to 70% of what you spend when you sell your home. Beyond that resale boost, you gain a playroom, home office, or guest suite you can start enjoying right away. That mix of daily comfort and solid return on investment (ROI) makes basement finishing one of the smartest upgrades you can tackle.

In some parts of the country—especially lots on swamps, high water tables, or other wetlands—local codes prohibit basements. Saturated soil puts constant pressure on foundation walls and lets water seep in faster than any sump pump can handle. 

If your property sits on waterlogged ground, building on a slab or crawl space is often safer, more affordable, and code-compliant.

Most basements wrap up in four to eight weeks. Framing takes three to five days, with electrical and plumbing rough-ins following over the next week. Add five days for drywall, two to three for flooring, and another week for paint, trim, and punch-list items. 

Delays can happen if materials run late or your contractor’s calendar is packed, so build in a little cushion when you plan.

Whether a finished basement counts toward your home’s official square footage depends on local rules. Many areas only include below-grade space if it has code-approved egress, fully finished walls, ceilings, and floors, plus consistent heating. 

Check with your local assessor or building department before you start; meeting those standards can affect taxes, appraisals, and resale value.

Building codes require a checklist: dedicated heat and electrical service, a code-approved stairway, and at least one egress window or exterior door. Walls, ceilings, and floors must be fully finished and meet insulation, ventilation, and fire-separation standards. If you add a bedroom, you’ll also need a closet, proper clearances, and safe exits. If you change the layout later, be ready to update the space so every new room still meets today’s code.

The Central Islip, NY homeowners’ guide to basement remodelings

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