Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.
Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.
Since 1973, Premium Technical Services (PTS) has been the Tri-State area’s trusted partner in foundation repair, below-grade waterproofing, and grouting. With more than 50 years of service and over 100 years of combined expertise on our team, we bring proven solutions to keep your foundation strong, dry, and secure for the long run.
Family-owned and operated since 2000, Complete Basement Systems (CBS) is proud to be Long Island’s longest-standing basement and crawl space repair company. For more than 25 years, we’ve helped homeowners protect their most valuable investment by preventing water and humidity damage. Our consultative approach sets us apart—we don’t just fix problems, we educate homeowners and deliver tailored solutions designed for lasting peace of mind.
Founded in 1984, PTS Foundation Supply (PTSFS) has been the Northeast’s go-to resource for helical piles, driven anchors, and installation equipment. From design to installation, we know how complex foundation projects can be. That’s why professionals across the region count on our 100+ years of collective experience to provide reliable products, expert insight, and a partnership that helps every project start—and finish—on solid ground.
Expert Long Island Basement Window Replacement & Repair Solutions
"*" indicates required fields
If your basement feels damp, drafty, or musty, your windows may be part of the problem. Aging panes, loose frames, and poor seals can drive up energy bills, invite water intrusion, and create the kind of conditions that lead to mold growth - especially when moisture is already finding its way in through foundation cracks. Our team specializes in Long Island basement window replacement and repair solutions that improve comfort, reduce moisture risks, and support long-term waterproofing performance.
Premium Technical Systems now brings together two trusted teams: Complete Basement Systems (CBS) for homeowners and light commercial properties across Nassau and Suffolk County on Long Island, and Premium Technical Services (PTS) for commercial, industrial, and engineered work throughout the NYC metro area. For basement window projects, you’ll work with the CBS specialists - backed by the capabilities and resources of the combined team.
Why Choose Premium Technical Services for Basement Windows?
When it comes to basement windows, the right solution is about more than swapping glass - it’s about stopping leaks, improving insulation, and making sure the installation fits the demands of older homes, soil conditions, and seasonal weather on Long Island. With Premium Technical Systems, you get a streamlined experience supported by years of experience serving both residential and commercial needs across the region.
Complete Basement Systems (CBS) provides basement window replacement, repair, and installation services for Long Island property owners. We do everything from new basement egress window installation to basement window replacement for older homes with outdated or deteriorating windows. Our process focuses on correct sizing, durable materials, tight seals, and local building codes with practical guidance so you understand your options before any work begins.
Call (516) 409-6000 to discuss the issues you're experiencing with a trusted Long Island basement window installer and get straightforward recommendations from an experienced local team. Get a free estimate for basement window services today!
Our Basement Window Services for Long Island Homeowners
Basement windows do a lot of work in a tough environment. In many Long Island homes, windows sit close to grade, face heavy rain and wind, and deal with constant humidity changes - making them more vulnerable to rot, corrosion, air leakage, and water intrusion. We offer complete service - from new installations to repairs and basement window waterproofing - so you can address the real cause of the problem, not just the symptoms.
Basement Egress Window Installation
A properly sized egress window can transform a basement from dark and closed-in to brighter, safer, and more functional. Our Long Island basement window installation service begins with an evaluation of the opening, well requirements (when needed), and other details like foundation condition and grading. Your basement window installer will ensure your new window meets code requirements that apply to an escape window, including minimum opening size and safe access for exit in an emergency.
If you’re finishing a basement or updating an older property, expert egress window installation helps ensure the space is both usable and compliant. Contact our specialists for professional basement window installation today.
Replacement Basement Windows
If you have an existing basement window that’s cracked, fogged, loose, or constantly leaking air and water, replacing it can be one of the quickest ways to improve basement comfort. We install replacement basement windows designed for below-grade conditions. We’ll help you compare options based on window type, insulation, durability, and price. Replacing an old window is also a smart upgrade when you’re tackling broader basement moisture or remodeling plans.
Expert Basement Window Repair
Not every issue requires a full replacement. If the problem is isolated - like a damaged latch, minor rot, or alignment issues - we can often perform cost-effective basement window repair. Depending on the window type, repairs may involve the window frame, window sash, or deteriorated wood components that allow air and water to pass through. We also perform basement window well repair to address drainage issues contributing to water damage.
If repairs won’t hold up, we’ll explain why a new window may be the better long-term choice.
Basement Window Waterproofing
Basement windows are a common entry point for moisture - especially when grading, wells, or seals have failed. Our basement window waterproofing solutions focus on sealing vulnerabilities, improving drainage around the opening, and reinforcing weak points so you get waterproof basement windows that stand up to Long Island weather. This is especially important if you’ve noticed staining, peeling paint, efflorescence, or recurring dampness around the window area.
Emergency Window Replacement
A broken pane, a failing frame during a storm, or sudden leakage can’t always wait. We offer emergency window replacement options for urgent situations where security, safety, or active water intrusion is a concern. Call us at (516) 409-6000 when replacing basement windows can't wait - we'll respond quickly to prevent further damage to your home.
Benefits of Energy Efficient Replacement Windows
Upgrading basement windows can deliver many benefits beyond aesthetics. Because basements often run cooler and more humid, old windows with poor seals can create drafts and temperature swings that force your HVAC system to work harder. A degraded wood, steel, or aluminum window frame allows moisture and pests in. Single-pane windows offer very little insulation.
Here are some of the benefits of investing in Long Island basement window replacement:
- Increased energy efficiency to lower energy bills
- Reduced strain on your HVAC system
- Improved comfort by preventing drafts, cold spots, and dampness
- Greater security with a working lock and a good seal against pests
- Prevent water damage and mold from moisture and leaks
- Increased natural light
- Better ventilation to help manage humidity and bring in fresh air when needed
- Makes your basement safer with an operational window or an exit for safety if you're replacing an egress window
- Increased home value
Basement replacement windows help make the basement feel like a cleaner, more livable part of the house, not an area you avoid.
Is it time to replace your old windows? Call (516) 409-6000 and get a free estimate from our expert basement window replacement contractors on Long Island.
Why Waterproofing Your Basement Windows Is Essential
Basement window leaks don’t just cause puddles - they can quietly fuel bigger problems over time. Water intrusion around a window opening can soak framing materials, damage finishes, and contribute to mold and mildew. Even small gaps can let humid air in, which condenses on cooler basement surfaces and keeps moisture levels high.
Waterproofing is essential because it addresses the “path” water uses to enter: failed seals, deteriorated surrounding materials, poorly draining window wells, and cracks or voids near the opening. Effective solutions often combine proper sealing with drainage improvements, so pressure and water have somewhere to go instead of forcing their way inside.
If you're experiencing leaks or water intrusion near a basement window, it may be coming from the window well, window frame, or the foundation. After isolating the cause, we'll recommend the most cost-effective and lasting solution, such as:
- Caulking to seal gaps
- Window well covers to block rain and debris
- Ensuring proper grading around the foundation
- Cleaning and extending downspouts
- Installing exterior drainage systems, such as a window well drain connected to a French drain or sump pump pit
- Foundation repairs, such as concrete crack repair with polyurethane injection
- Basement waterproofing membrane applied to the foundation walls
If you’re seeing recurring dampness, staining, or moisture near a basement window, it’s worth addressing quickly - before repairs become more extensive.
Need immediate help? Call (516) 409-6000 now for a free consultation.
Basement Window FAQ
Common problems with basement windows include water leaks around the frame, drafts from failed seals, condensation from high humidity, and rotting wood or metal frames. On Long Island, most homes were built before the 1970s. These older homes are less energy efficient than newer construction, and many have old windows ready to fail. Heavy rain, a high water table, soil prone to shifting, and decades of hidden foundation problems contribute to issues that may require basement window replacement.
Cracked glass, stuck sashes, and deteriorated caulking are also frequent issues that may require basement window repair or replacement.
You may need basement window replacement if you see recurring leaks, visible rot, or rust on the frame, cracked or fogged glass, or persistent drafts that raise heating and cooling costs. Difficulty opening or locking the window, a loose sash, or water staining around the opening are also common warning signs. In Long Island basements, repeated seepage after heavy rain often indicates failed seals or a deteriorated window well system that needs attention.
On Long Island, the average basement window replacement cost is $450, with a typical price range of $250 to $750 per window installed. The average cost for basement casement windows is $550 installed. These windows have hinges on one side and open outward for ventilation. The cost depends on window type, size, frame material, and whether repairs or extra work are needed. Costs rise when the opening must be resized, a window well needs drainage work, or there is water damage.
The average egress window installation cost is about $3,000 to $10,000+ per window. The cost depends on the size, type, and scope of the project, or the amount of structural and excavation work the basement window installer needs to perform.
Yes, Long Island building codes follow the International Residential Code, and IRC Section R310 requires at least one operable emergency escape and rescue opening for every basement bedroom or finished basement to provide an exit (egress windows or doors) to a yard or public way. To meet code, the clear opening must be at least 20 inches wide and 24 inches high, the sill must be no more than 44 inches above the floor, and below-grade windows need a well (9 sq. ft., 36-inch projection/width) with ladders/steps if deeper than 44 inches for fire escape. An egress window must be opened easily by hand.