Replacement Windows and Doors in Long Island, NY
NSE Windows delivers premium replacement windows and doors, including exclusive Infinity by Marvin fiberglass products, with expert installation and personalized guidance throughout your project.
As Long Island's exclusive Marvin Certified Installing Retailer, NSE combines top-tier brands like Marvin and Infinity by Marvin with unmatched local expertise. Our highly trained, certified installers ensure flawless results using durable Ultrex® fiberglass that's energy-efficient, low-maintenance, fade-resistant, and built to last—outperforming traditional materials for beauty, strength, and efficiency.
NSE Windows is deeply rooted in the Long Island community, we prioritize exceptional service, pride in craftsmanship, and hassle-free experiences—from consultation to completion. Our team handles every detail so you can enjoy a smoother process and a more comfortable, beautiful home.
With three convenient showrooms in Hauppauge, Massapequa, and Water Mill, we proudly serve Nassau and Suffolk Counties, from the Hamptons to Bethpage and beyond.
Connect with NSE Windows in Long Island
Schedule a consultation for expert advice, custom recommendations, and a quote tailored to your style and budget. We're committed to making your window and door replacement project stress-free and rewarding.
"Can’t say enough about NSE windows. The entire experience, starting with the sales rep John and ending with Mike and his team installing the windows, was amazing. They went above and beyond to ensure that a challenging job was done as professionally and efficiently as possible. The price was very competitive, and the work was done quickly but also with care and attention to detail. Can’t ask for anything more from a window company. Absolutely recommend NSE to anyone looking for quality windows with quality service."
- - Steven B., Long Island, NY Homeowner