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.
"NSE Windows in Massapequa did an unbelievable job at my house. We had a very specific project with very specific requirements. Eric and his team knocked it out of the park from design to measurement to fitment, install and finish! We couldn't be happier with all of our custom windows from NSE. Eric is one of the most professional and thorough consultants/contractors I dealt with in redoing my house! Marvin windows were head and shoulders above the rest in my opinion compared to our previous windows which were also newer from leading competitors and these blew them away! The fit and finish of Marvin including the ease of handles are absolutely amazing! Thank you, Eric, and team!!"
- Harry S., Long Island, NY Homeowner