Serving Connecticut, Westchester and Putnam Counties

Contact Us For
A Free Estimate!
Reviews From Thornwood
Products & Services
Basement Waterproofing Services & Products
WaterGuard Interior System
DryTrak Drainage Channel
TrenchDrain Drain Grate
IceGuard Discharge Line
FlexiSpan Wall Crack Repair
Polyurethane Crack Sealing
WellDuct Window Drainage
BrightWall Waterproof Panels
ThermalDry Wall Barrier
Basement To Beautiful Pre-finishing Wall Insulation Panels
Drain Tile Installation
SuperSump Pump System
TripleSafe Pumping System
UltraSump Battery Back Up
Sanidry Basement Dehumidifier
French Drain Alternatives


Crawl Space Repair Services & Products
CleanSpace Encapsulation Vapor Barriers And Liners
Turtl Access Hatch
EverLast Crawl Space Doors
Sanidry Csb Crawl Space Dehumidifier
SmartDrain Water Drainage
SilverGlo Wall Insulation
TerraBlock Floor Insulation
SmartSump Sump Pump
Crawl-o-Sphere Crawl Space Fan
WallCap Block Wall Sealer
SmartVent Flood Vents


Foundation Repair Services & Products
Push Pier Underpinning For Settlement, Foundation Leveling, Sinking Foundation Repair
Geo-lock Wall Anchors
Geo-lock Helical Anchors
PowerBrace Bowed Wall Repair
CarbonArmor Fiber Wall Repair
SmartJack Crawl Space Support
Slab Pier Repair
Foundation Underpinning
EZ Post Deck Repair
Shotcrete Wall Restoration


Basement Finishing & Remodeling
Everlast Wall Panels
Insulated Wall Panels
Premier And Linen Ceiling Tiles: No-sag Warranty
Thermal Dry Floor Tiles
ThermalDry® Elite Plank Flooring
Sunhouse Window Wells
Everlast Window Replacement
Rockwell Basement Egress Windows


Company Awards
2017 Angie's List Super Service Award
Connecticut Basement Systems has been awarded the 2017 Angie's List Super Service Award®! The Angie’s List Super Service Award honors... [Read more]
Larry Janesky award the Valley of Chamber of Commerce's Silver Medal Award
Larry Janesky was awarded the Valley Chamber of Commerce's Silver Medal Award for the Big Build at Ansonia Nature Center!... [Read more]
Best Places to Work
For the 3rd time, Basement Systems has won the Best Places to Work award for being one of the best... [Read more]
More Awards

Thornwood, NY's Respected Crawl Space & Foundation Repair Pros

Chuck was great help to me! I also love the products that Connecticut Basement Systems offers....
Happy Customers Surrounding Thornwood, NY
Work Requests

Click the icons to see what our customers had to say.

Thornwood, NY's expert in basement waterproofing, foundation repair, & more

Connecticut Basement Systems has been your trusted home improvement company providing reliable basement waterproofing, foundation repair, crawl space encapsulation, basement finishing, and more to over 85,000 New York homeowners since 1987. As a three-time winner of the CT Better Business Bureau's Torch Award for Marketplace Ethics, we are committed to creating an honest and reliable experience with our customers.

Whether you need a moisture-proof basement waterproofing system complete with a sump pump or permanent foundation settlement repairs, we provide these solutions and much more!

Our services in Thornwood:

  • Basement waterproofing
  • Foundation repair
  • Crawl space repair
  • Basement finishing
  • Air purifiers
  • And more!

Schedule a free estimate to learn more. Connecticut Basement Systems proudly serves Thornwood and areas nearby!

Trusted basement waterproofing company serving Thornwood

A wet basement can affect your home more than you think. If left to worsen, water in the basement can cause structural issues, mold growth, pest problems, and more. That is why Connecticut Basement Systems provides patented basement waterproofing solutions, designed to keep your below-grade space dry and healthy for years to come! So, if you're tired of dealing with basement flooding, high humidity, water in basement, or other waterproofing issues, contact our experts today!

Our basement waterproofing services in Thornwood:

  • Sump pump installation & maintenance
  • Basement drainage systems
  • Basement Dehumidifiers
  • Basement windows
  • Egress windows & window wells
  • And more!

Since 1987, we have provided warrantied basement waterproofing solutions to Thornwood homeowners - this includes sump pumps, basement dehumidifiers, french drains, and more. Schedule a free basement waterproofing estimate to learn more!

Transform your home with basement finishing in Thornwood

Want to transform your dreary basement into the space of your dreams? From a lavish apartment to a new play area for the kids, Connecticut Basement Systems can help you with these remodeling projects and more - the only limit is your imagination! Unlike other basement finishing contractors, we actually use remodeling products designed to withstand common environmental conditions in the below-grade space, including moisture and mold. Plus, the basement finishing system is warrantied, has insulating qualities, dampens noise, and is eco-friendly.

Our basement finishing system in Thornwood:

  • Finished basement flooring
  • Waterproof wall products
  • Ceiling tiles
  • Basement dehumidifiers
  • Replacement windows
  • Egress windows & window wells
  • And more!

Schedule a free basement finishing estimate to learn more. We proudly serve Thornwood and areas nearby.

Permanent foundation repair solutions in Thornwood

No matter how minor your home's foundation problem seems, it is always better to schedule a foundation inspection and get repairs sooner than later. That is because issues like foundation settlement, leaning chimneys, bowing walls, and more can affect your house's value and curb appeal. Even worse, they can create unsafe living conditions for you and your family.

But there is no reason to worry - Connecticut Basement Systems is backed by Supportworks, a nationally renowned network of expert foundation repair contractors. This partnership also gives us exclusive access to professional training, warrantied solutions, and best practices proven by hundreds of dealers across the globe.

Our foundation repair services in Thornwood:

  • Slab piers
  • Push piers
  • Helical piers
  • Foundation wall repairs
  • Crawl space support jacks
  • Wall anchors
  • Wall reinforcing systems
  • And more!

Schedule a free foundation repair estimate to learn more. We proudly serve Thornwood and areas nearby.

Reliable crawl repair & encapsulation services in Thornwood

A nasty crawl space can cause a lot of issues for the home. If left unrepaired and unsealed, the crawl space can start to rot and grow mold, leading to structural issues, unhealthy indoor air, and discomfort throughout the house. That is why Connecticut Basement Systems provides moisture-proof crawl space encapsulations and durable structural repairs.

When we seal the crawl space using a moisture-proof vapor barrier, add a high-performance crawl space dehumidifier, install crawl space jacks for failing support posts, and provide other crawl space repair solutions, we can create a dry, secure below-grade space for years to come!

Our crawl space encapsulation & repair services in Thornwood:

  • Crawl space vapor barrier
  • Crawl space drainage system
  • Crawl space dehumidifier
  • Crawl space insulation
  • Crawl space support jacks
  • And more!

Schedule a free crawl space repair and encapsulation estimate to learn more. We proudly serve Thornwood and areas nearby.

Quality basement waterproofing, crawl space repairs, & more since 1987

Connecticut Basement Systems is the largest basement waterproofing, foundation repair, crawl space encapsulation, and basement finishing company in Thornwood - and for good reason. We are committed to improving the lives of our employees, customers, and the world through education and development. For over 30 years, we have built a solid reputation backed by honesty and expertise. So you can have absolute confidence in our services!

Contact us to schedule a free estimate today. We proudly serve Thornwood and nearby areas.

Job Stories From Thornwood, NY
WaterGuard and ThermalDry Flooring in Thornwood, NY

This Thornwood, NY home had a water issue in his basement that prevented him from utilizing the space to its full potential. He also wanted to have a finished area for all to enjoy. After doing his research he decided to trust the experts at Connecticut Basement Systems and schedule a free, no obligation appointment.

On the day of the appointment, Sales Representative Gary Meglino arrived at the home to evaluate the basement. He concluded that the water issue would need to be addressed first. He recommended a WaterGuard system which will collect water internally before it enters the basement. It will then channel the water to the SuperSump that will discharge the water away from the home. This system will keep the basement dry. In addition, Gary suggested to have new flooring and wall restoration done to make the basement dry and enjoyable. After reviewing each product thoroughly, the homeowner decided to follow through with the project.

On the day of installation, Foreman Al Guglielmoni and his crew installed the WaterGuard System and SuperSump pump professionally and efficiently. Once the waterproof system was placed, Foreman Kevon Barnett installed wall restoration and ThermalDry elite pecan flooring. The wall restoration will replace the water damaged walls that were previously in the basement and will resist any mold or mildew growth. The ThermalDry flooring not only looks beautiful, but it is waterproof and warmer compared to traditional concrete flooring. This is exactly what the homeowner had wanted and was pleased with his waterproofed and finished basement! 

Work Requests From Thornwood, NY
Project Location: Thornwood, NY
I have what appears to be water coming up through the foundation in my laundry room in my basement. I believe the home needs a new drainage system setup around the rear of the home.
Project Location: Thornwood, NY
Our basement has recently started flooding during heavy flash flood periods of rain. We have a sump pump in the basement but the water is coming in, in a different location.
Project Location: Thornwood, NY
Water in basement after recent heavy storm. We discovered immediately and cleaned with towels but interested in a solution to prevent further problems.
Project Location: Thornwood, NY
Seal cracks in basement
Project Location: Thornwood, NY
Water seepage in one corner of basement
Project Location: Thornwood, NY
Need French drain, sum pump, maybe new basement windows and egress.
Project Location: Thornwood, NY
Selling a home that showed some water in basement.
Project Location: Thornwood, NY
We just moved into a house and looking to get a quote and suggestions on how to best insulate our crawl space in a split level under the kitchen, dining room and living room.
Project Location: Thornwood, NY
I would like a quote on a crawl space barrier installation
Project Location: Thornwood, NY
Basement Finishing Estimate
Project Location: Thornwood, NY
I recently purchased this house so I don't have much history to talk to you about. The basement shows signs of previous water damage but tested dry at time of home inspection. There was some normal damnpness that a dehumidifier took care of. However, after yesterday's rain storms I have significant water in in my basement. Not a ton, not even a 1/8 of an inch, but it was wet, and I m in the process of turning it into a kids playroom, so any water is bad. I would appreciate a cost a talk about my options a pricing them. Thank you
Project Location: Thornwood, NY
Concerned about where water comes into the basement and possible cracks in the foundation.
Project Location: Thornwood, NY
About 6 months ago had water seep in basement after heavy rainfall. With rain past few days I'm seeing for the first time since then rain beginning to seep in again. I've only been in the house less than two years, I personally took up all carpets and removed Sheetrock 4ft and down. I can now see exact areas of vulnerability. Would like to see what a more permanent solution would cost. Thanks
Project Location: Thornwood, NY
Garage/basement flooding
Project Location: Thornwood, NY
I have an unfinished basement. Would like to know the cost to finish it up.
Project Location: Thornwood, NY
Water seeps into basement of store approximately two feet below grade and about 10 ft long when it rains basement exterior wall is poured concrete.
Project Location: Thornwood, NY
I would like an estimate to have a sidewalk raised about 1"