High-End Window Replacement in Southampton, NY
Upgrade the elegance, comfort, and efficiency of your Southampton home with custom window solutions from Thermo-Seal. For over 35 years, we’ve served the East End with precision-crafted windows designed for the coastal climate and classic architecture of Southampton. Whether you own a historic estate on Hill Street, a new build in Water Mill, or a modern bayfront property in North Sea, our windows provide unmatched performance and aesthetic harmony, installed with white-glove service by our expert team.
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Schedule Your Free In-Home Consultation
Custom Window Options Designed for Southampton Homes
We offer a full range of styles, all ENERGY STAR® rated and professionally installed:
- Double-Hung Windows – Easy to clean, classic design
- Casement & Awning Windows – Superior ventilation and seal
- Bay & Bow Windows – Dramatic curb appeal and light
- Sliding Windows – Smooth operation and space-saving
- Picture Windows – Expansive views, maximum efficiency
Every window is built with advanced glass packages to reduce heat loss, block UV rays, and lower your energy bills.
BAY & BOW
CASEMENT
DOUBLE-HUNG
GARDEN
PICTURE
SLIDING
Bay & Bow Windows in Southampton
Elegant Views, Expanded Space
Add architectural elegance to your home with expansive bay and bow windows—perfect for capturing garden views in Water Mill or creating a sun-filled breakfast nook overlooking Meadow Lane. These window styles enhance curb appeal while flooding your space with natural light. Choose from customizable configurations, seat board options, and energy-efficient glass packages—all designed for durability, comfort, and timeless appeal. Our expert team ensures a flawless installation that transforms both the inside and outside of your Long Island home.
Casement Windows in Southampton
Sleek Design, Maximum Ventilation
Enjoy unobstructed views and coastal breezes with casement windows that open wide to the South Fork air. Popular in Southampton’s waterfront neighborhoods like North Sea and Shinnecock Hills, they provide superior ventilation, clean lines, and top-tier insulation against the elements. Built with advanced sealing technology and high-performance glass, they deliver outstanding thermal insulation and weather resistance, even in Long Island’s coastal climate. Customize your look with multiple frame finishes, grille patterns, and hardware options for a clean, contemporary aesthetic.
Double-Hung Windows in Southampton
Classic Style, Modern Efficiency
Perfect for the Colonial and traditional homes found in Southampton Village, double-hung windows offer classic style with modern function. Our energy-efficient designs feature tilt-in sashes for easy cleaning and reinforced weather seals—ideal for seasonal homeowners and year-round residents alike.
Designed with two operable sashes that tilt in for easy cleaning, these windows offer versatile ventilation, excellent airflow control, and low maintenance convenience. Each unit is built with multi-chambered frames, energy-efficient glass, and weather-tight seals to enhance insulation and reduce energy costs year-round. With a variety of finishes, grille designs, and hardware options, double-hung windows are a smart, stylish upgrade for any room.
Garden Windows in Southampton
Bring the Outdoors In
Bring a touch of greenery into your kitchen with a custom garden window. Ideal for Southampton’s classic kitchens and sun-drenched cottages, garden windows offer additional shelf space and light—perfect for herbs, plants, or charming coastal decor. With operable side vents for ventilation, energy-efficient glass, and durable, low-maintenance materials, our garden windows offer both form and function. Enjoy panoramic views and extra shelf space while brightening up your interior with natural light—all with expert installation and long-lasting performance tailored for Long Island homes.
Picture Windows in Southampton
Expansive Views, Maximum Efficiency
Designed for the luxury homes and open landscapes of Southampton, picture windows provide panoramic views with maximum energy efficiency. Ideal for showcasing outdoor scenery or dramatic interior focal points, these fixed windows offer large, uninterrupted glass panels for timeless sophistication. Built with high-performance insulated glass and airtight seals, our picture windows enhance energy efficiency, reduce outside noise, and deliver a clean, modern aesthetic. With customizable sizes and frame finishes, Thermo-Seal’s picture windows are a stylish, energy-smart choice for Long Island homes.
Sliding Windows in Southampton
Sleek, Space-Saving Performance
Sliding windows are a smart solution for modern homes or pool houses in Southampton’s estate sections. With easy-glide operation and minimal maintenance, they offer both functionality and a clean, contemporary look—perfect for lower-level spaces or compact room designs.
These horizontally gliding windows feature smooth-operating tracks, low-profile frames, and wide glass areas that bring in natural light while maintaining excellent insulation. With dual operable sashes and easy-to-remove screens, sliding windows are great for rooms where space is tight but ventilation is essential. Built to resist drafts, moisture, and wear, they deliver long-lasting performance with minimal upkeep—a smart, stylish solution for any home.
Get Your Free Quote Today
Ready to upgrade your windows? Contact Thermo-Seal now for a free, no-obligation estimate. Our local team is ready to help you choose the perfect windows for your home and budget.
Call 631-849-0434 or fill out the form to get started!
Expert Craftsmanship, Backed by Decades of Local Experience
Thermo-Seal’s certified installers handle every detail, from initial measurement to clean-up. No shortcuts. No surprises.
- Lifetime product warranties
- Satisfaction guaranteed
- Fully licensed and insured
- Flexible financing options available
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.
