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Top-Rated Foundation repair specialists in Nassau - Updated Nov 2026

Avatar for Adirondack Basement Systems, Inc.
Adirondack Basement Systems, Inc.
4.6(
107
)
Concrete Foundation - Repair

Serving Nassau, NY and surrounding areas

Approved (Corporate)

In business since 1998

Free estimates

Warranties offered

"It was a complex project. They were very careful with their procedures and raised sunken concrete sections next to the house and around a pool to allow for drainage. They filled the major cracks. They were courteous and on-time over several days. After many years the water in the basement problem has been resolved."
Additional Photos
SaniDry Sedona Dehumidifer
Additional Photos
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Additional Photos

+9

Response time12 hrs
Response rate100%
8 neighbors recently requested a quote
Avatar for G & G Landscaping
G & G Landscaping
4.9(
129
)

Serving Nassau, NY and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"G & G landscaping did an amazing job! Giacomo worked with us to refine the job and keep it within our budget. It turned out better than we could have anticipated. We needed to contain a hill that was eroding. Instead of a retaining wall, he had the idea to use very large boulders that matched the boulders around our pond. The end result looks like it was installed when the pond was installed. He and his crew worked nonstop until it was finished. They took care not to damage the yard with their heavy equipment and took the time to consult with me a few times during their work. I highly recommend them for hardscaping. Honest, dependable, punctual, and respectful of the property"
Response time12 hrs
3 neighbors recently requested a quote
Recommended by81%of homeowners
Avatar for All Dry Basement
All Dry Basement
4.2(
22
)
Concrete Foundation - Repair

Serving Nassau, NY and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"It’s been 5 months since Todd and his crew encapsulated my crawl space but I wanted to wait to give a comprehensive review of their services and the outcome of their work. The short answer is: I’m thrilled! Here’s the story: Last summer I bought a small home which has a crawlspace. As soon as the weather turned humid I noticed a distinctly musty/earthy odor. When I had central air installed, all it did was exacerbate the situation by blowing the air from the crawlspace all over the house. To say I was distressed is an understatement. I wasn’t sure encapsulation was the answer but after calling around and doing some online research there didn’t seem to be any other obvious solutions. While I had built one new house (full basement) and gut renovated another (slab foundation) I found myself in new territory with an older home (60s) and a crawlspace. Doug came in and did a consultation. I had a lot of questions and deep dove the technical details. I’m sure it was trying for both Doug and Todd, but every question I had was answered promptly and thoroughly (something other companies failed to do). I decided to go for a full encapsulation solution with a commercial humidifier, drain, and some underlayment in particularly rough areas. Todd (and his assistant Kyle) did outstanding work and every unexpected issue they encountered was handled quickly and professionally. When they found rotting wood forms that were left from when the concrete supports were poured, they pulled them out. When they found some rough areas of construction debris around the perimeter, they cleaned that out. And when Todd found some minor seepage in the corner of the crawlspace that he traced it to the outside where a downpipe was punctured and draining too close to the house, he went and bought some new downpipe and repaired it--charging me just for the materials. To say that these guys went above and beyond is an understatement. Any homeowner knows that feeling of having made a horrible mistake and I wasn’t sure the crawlspace issue could be fixed. Not only did Todd and his crew do an amazing job but they put me at ease throughout the process. They were punctual, tidy, thorough and just generally great to work with. I couldn’t recommend them more highly! (Now if only I could find other contractors who are just as good…) P.S. The other reason I waited so long to write a review is that in my particular situation, there is little separation between the air of the crawl space and the rest of my small house. So after it was first encapsulated, there was a strong smell of… well kind of a mix between plastic and dryer sheets. It was not terribly unpleasant but distinct and noticeable (and I’m very sensitive to smells). If anyone else experiences this, I recommend buying a large fan for the crawlspace and using it periodically to move the air from the crawlspace out of the house and move fresh air in. (I bought a cheap contractor fan that pivots upwards and put it on a smart home remote). Over the course of a few months it dissipated and I’m thrilled to report that I don’t notice it at all now."
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+7

Response time1 day
Response rate100%
21 neighbors recently requested a quote
Avatar for Groundworks
Groundworks
5.0(
6
)
Concrete Foundation - Repair

Serving Nassau, NY and surrounding areas

Approved (Corporate)

In business since 2019

Free estimates

Warranties offered

"We cannot say enough good about Dylan, Seth and Tim. 3 very hard workers. Lifting heavy heavy loads of concrete and stone up my and down my cellar and porch steps. They never stopped for breaks. Great workers. Respectful and pleasant and knew their job requirements. Very careful with doors, floors etc It?s a messy job. ThankYou"
Foundation
Foundation
Foundation
Foundation
Foundation

+14

246 neighbors recently requested a quote
Delanson Gardens
4.6(
79
)

Serving Nassau, NY and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

"I ended up choosing to do it myself. It was to put a French drain in my back yard. It cost me only $700 but if I had them come in it would have cost me like $2500. It was the price that really threw me off. As for their overall outlook they seemed to be a very decent company. It was very good, I had no problems with them. Their price was way above what I expected to pay.  I wasn’t happy with the estimate."
Response time3 days
Response rate100%
Recommended by90%of homeowners
Avatar for LaBello's Masonry and Waterproofing, LLC
LaBello's Masonry and Waterproofing, LLC
3.5(
186
)
Concrete Foundation - Repair

Serving Nassau, NY and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"Chad came over on a Friday to give me an estimate on a foundation repair on my garage which faced my pool. He knew exactly how to fix it and said he could do it the next day since it was a relatively small job. He came over the next day with his son and they both got to work right away. They were both very friendly and very easy to talk to and work with. They completely repaired the garage wall as well as filled in some cracks on the concrete around the pool. He also gave me an easy fix for another small repair on my patio. They took something that was an eyesore and made it look brand new and also protected the structural integrity of the garage. His work also comes with a 2 year warranty which gives peace of mind. Chad and his son were a pleasure to work with and I will definitely call them again for any other masonry project or repairs I have in the future!! Thank you very much!"
LaBellos Masonry
Foundation Repair
Basement and foundation
Exterior block wall
Exterior waterproofing

+1

Response time7 hrs
61 neighbors recently requested a quote
Recommended by74%of homeowners
Avatar for Expediant Environmental Solutions, LLC
Expediant Environmental Solutions, LLC
3.9(
438
)

Serving Nassau, NY and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"Great! An honest business will always prosper. Thanks so much for being concerned and honest as oppose to being money hungry and false. Rep was also very knowlegable."
Response time2 days
Response rate100%
13 neighbors recently requested a quote
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