Who Is GNP? Roofing, Siding, Window and Door Installation Company

Honesty, integrity & experience

As a family-owned and operated business of the second generation, we take pride in fostering transparent and long-lasting relationships with our clients. Roofing and project execution are just the basic aspects of our business, which we carry out with the help of our team of highly skilled and professional installers. Our goal is to provide a hassle-free experience as a Long Island Roofing and Siding Contractor. Our superior warranties and seasonal inspections set us apart from our competitors, and we eagerly anticipate the opportunity to work with and meet our future clients. Time and time again, clients turn to GNP Roofing, Siding & Windows for professional, top-notch results with a personalized approach. We take great care in treating your home as if it were our own and extend the same familial courtesy to you.


“We received the best services we could hope for!”


Licensed Contractor In Suffolk County

Suffolk County Licensed Contractor. We are grateful to be able to call Long Island our home. We live in a beautiful area, with so much to offer within a short distance.  As proud members of this community, we can’t help but be concerned when we see signs in yards of neighborhoods we drive by often. Or worse, areas where we are working hard to provide superior customer service to our customers. We can’t help but worry, who is going to be here after the job is done to provide assistance to these customers? We want to assure you we will and will continue improving our community, home by home. And we will be here if you need us, long after your project is completed.

GNP Roofing, Siding and Window Projects

Take a look at a handful of our completed projects across, Suffolk County Long Island. From siding and roof replacement to window, door, and gutter installations, GNP Roofing and Siding is proud to be your local Long Island contractor for any exterior remodeling project you have. Famil-owned and operated contractor for over 30 years.

Get in touch today – Long Island COntractor

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    “Outstanding Work”

    Yesterday George and his wonderful team of workers did a roof replacement on my house. They did a superb job. I was very pleased with the quality of work on my roof. After the job was done they did an amazing job of cleaning up which left my property spotless. I hired George on the spot after discussing the job and estimate with him. He’s an honest contractor who delivers what he promises. I would recommend George in a heartbeat.