Windows, Doors, Siding, Roofing & Gutters in Greenport, NY
Exterior Home Services for Greenport’s Historic & Coastal Homes
In Greenport—where historic charm meets coastal living—Thermo-Seal delivers exterior upgrades that honor your home’s character while enhancing comfort and resilience. Whether you’re restoring a 19th-century Victorian near Front Street or upgrading a bayside cottage overlooking Peconic Bay, our team installs custom windows, doors, siding, roofing, and gutter systems designed for Greenport’s architecture and shoreline climate. Trusted across the North Fork for over 35 years, we bring quality craftsmanship and deep local knowledge to every project.
Unlike other exterior remodelers, we never use subcontractors, our full-time team ensures consistent quality and superior results. With elite-level certifications from leading manufacturers, such as Andersen Premier Certified Contractor, GAF Master Elite Contractor, and James Hardie ALLIANCE member designations, we bring the highest standards to every project.
WINDOWS
DOORS
SIDING
Roofing
Gutters
Window Replacement in Greenport
Choose from double-hung, casement, picture, and bay windows that retain the historic aesthetic of Greenport Village homes while delivering modern energy efficiency. Built to resist salt air and seasonal swings, our windows are ideal for homes along Main Street or near Stirling Creek.
Upgrade your home with high-performance Andersen windows, including composite Fibrex®, wood, fiberglass, and vinyl options. We also offer premium selections from Pella and Harvey, all backed by a limited lifetime warranty. Our expertly installed energy-efficient windows enhance curb appeal, improve insulation, and provide long-lasting durability with superior craftsmanship.
Exterior Doors in Greenport
We install secure, stylish entry doors that fit everything from vintage cottages on Fifth Street to new builds near Pipes Cove. French, sliding, and storm door options available for enhanced functionality and curb appeal. Our expertly installed doors improve energy efficiency while elevating the beauty and functionality of your home’s entrance and living spaces.
Siding Installation in Greenport
Preserve Greenport’s signature charm with wood-look vinyl, authentic cedar shake, or fiber cement siding. Our siding solutions match the character of historic facades while protecting against bay winds and salt spray—perfect for homes near Greenport Harbor.
We also proudly offer vinyl siding from CertainTeed and Westlake Royal Building Products, as well as cedar shake siding which will add a touch of natural warmth to your home. Available in multiple styles, our siding options provide superior protection and timeless beauty with minimal maintenance.
Roofing in Greenport
From steep gables on historic homes to low-slope roofs on coastal cottages, we offer architectural shingles, metal panels, and tile roofing designed to weather Long Island storms and enhance Greenport’s classic look.
Protect your home with premium roofing solutions, including GAF asphalt shingles, tile, metal, and copper roofing. As a GAF Master Elite Contractor, we ensure expert installation and long-term durability. Our high-quality materials and professional craftsmanship offer superior weather resistance, energy efficiency, and a long-lasting, beautiful roof built to withstand the elements.
Gutter Systems in Greenport
Keep rainwater in check with seamless aluminum gutters and optional leaf guards—custom-fit for both antique homes and modern North Fork retreats. Our systems are designed to protect foundations and preserve architectural integrity.
Our high-performance gutters efficiently channel water away from your home, preventing costly water damage and erosion. Designed for durability and minimal maintenance, our systems keep your home safe while minimizing the need for gutter cleaning.
What Our Clients Are Saying
We strive to make the entire home remodeling experience positive for our customers—from your first phone call, until the final handshake.
“I had a very good experience with Thermo-Seal. Chose them after interviewing many others because they’re local, communicated efficiently, and offered good midrange pricing and lifetime warranty. The crew did a fantastic job with the installation. They came early and finished 5 windows in 5 hours, and then they cleaned up. Highly recommended!”
Patrick B.
“We just completed a window and siding job for our home with Thermo-Seal. We are very impressed and satisfied with the quality of their products as well as the installation. I would recommend this company & I would use them again in the future if needed.”
Mindy L.
“The crew was a pleasure to work with, and we love our new windows. The installation was efficient, and the team was very professional. I’ve seen a difference in my heating bill since the install, which was our primary goal so we are very happy so far! I will work with Thermo-Seal again for a front door replacement when the time comes.”
Bonnie K.
“We hired Thermo-Seal for new windows and siding and I could not be happier! Their team is on time, professional, and meticulous about their work. You can tell they take pride in their output and ensure things are done correctly the first time around. The project completed ahead of schedule and we were kept in the loop the entire time. Very happy with their work and highly recommended!”
Sarah C.
“We were referred to Thermo-Seal by a neighbor who was very pleased with the results. We replaced seven windows and a sliding patio door are thrilled with the results and how much they enhance the appearance of our home. Without hesitation, we recommend Thermo-Seal for your home improvement projects.”
Frank D.
“Cannot believe how stress-free an experience it was dealing with Aaron and his team. Aaron was very patient with our multiple questions and never any sales pressure. The installation was clean, quiet and the installation team friendly and helpful. The windows were installed a few weeks before they were promised and there were no surprises. We will be strongly recommending Thermo-Seal to friends looking for replacement windows.”
David B.
Why Greenport Homeowners Trust Thermo-Seal
For over 40 years, homeowners have trusted Thermo-Seal for superior exterior remodeling. We deliver expert craftsmanship, high-quality materials, and an unwavering commitment to customer satisfaction. With a proven reputation, professional in-house installers, and industry-leading warranties, we ensure every project is completed with precision, care, and lasting value.
Free, No-Hassle Estimates
We believe in transparency and convenience. Our free, no-obligation estimates give you a clear understanding of your project’s scope and cost—no pressure, no hidden fees, just honest advice.
In-House Installers
Unlike many contractors, we never use subcontractors. Our full-time installers ensure consistent craftsmanship, quality, and accountability, delivering superior results ever time.
Decades of Experience
Since 1985, we’ve been transforming homes across the Tri-State area. With more than 40 years of expertise, we provide top-quality remodeling solutions backed by a trusted reputation.
100% Satisfaction Guaranteed
Your happiness is our priority. We back every project with a 100% Customer Satisfaction Guarantee, ensuring you receive high-quality service and results that exceed expectations.
Certified. Trusted. Proven.
When you work with Thermo-Seal, you can expert craftsmanship backed by trusted credentials. We’ve partner with the industry’s leading manufacturers, earning their top certifications to bring you the best products on the market. As a fully licensed and insured company, we ensure your investment is protected at every step.
