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.
"Completed an entire gut home renovation and extension with 40+ windows, sliding door, side door and front door. Before working with Eric @ NSE, I had spoke to a few other door & window companies and I couldn't be happier with my decision to work with Eric. Eric is an EXPERT in his business. Never did I feel as if I was being "
- sold". He knows his products, addressed each and every question and concern and he delivered everything as agreed to and ahead of schedule! Top notch service! I've recommended him to a few friends who have used him as well and they all had the same experience." Chris P., Long Island, NY Homeowner