Doors
Door Installation in Long Island
40 Years of Experience
Certified Professionals
Superior Workmanship with Proven Reputation
Stress-Free Process
Thermo-Seal Windows, Siding & Roofing, Inc.
Door Installation in Long Island — Trusted by Tri-State Homeowners for Over 40 Years
Looking for expert door installation on Long Island to improve your home's energy efficiency, security, and curb appeal? With over 40 years of experience, Thermo-Seal delivers high-quality door installation services using top brands like Andersen, Pella, Therma-Tru, and Harvey. Whether you’re replacing a weathered entry door, adding a storm door, or upgrading to sleek sliding glass doors, we offer professional installation for homeowners across Long Island and throughout New York and Connecticut.
From the scenic North Shore to the bustling communities along the South Shore, Long Island residents count on Thermo-Seal for expertly installed doors that enhance both function and style.
DOORS
Experience the Difference with Thermo-Seal Door Installation in Long Island
Proper door installation on Long Island requires precision, quality materials, and reliable professionals. That’s why at Thermo-Seal, our certified in-house team—never subcontractors—handles every installation with care and consistency.
We offer a variety of exterior doors tailored to Long Island homes:
✔ Entry doors that offer strong security and a polished look
✔ Sliding glass doors for smooth access and added natural light
✔ French doors that add elegance and openness to any space
✔ Storm doors that increase insulation and shield against the elements
From fiberglass to steel to wood, we help you choose the best material and install it with expert attention to detail.
Solving Homeowner Pain Points with Precision Door Installation in Long Island
Outdated, poorly installed, or damaged doors can lead to higher utility costs, security concerns, and comfort issues. That’s why Long Island homeowners turn to Thermo-Seal for door installation that solves real-world problems while upgrading the look of their home.
✔ Enhancing insulation and efficiency with properly sealed doors
✔ Improving safety with reinforced construction and premium hardware
✔ Blocking noise and drafts for better indoor comfort
✔ Modernizing your home’s exterior with updated, attractive doors
We bring top-tier certifications—including GAF Master Elite and Andersen Premier Certified Contractor—to every Long Island installation.
Who Benefits Most from Thermo-Seal Door Installation in Long Island?
Thermo-Seal’s door installation service on Long Island is the right choice for:
✔ Homeowners replacing aging or broken doors
✔ Families improving energy savings, design, or security
✔ Sellers preparing their homes for a competitive market
✔ Anyone seeking dependable installation from experienced professionals
No matter where you live on Long Island, our team customizes the installation process to fit your home and goals.
Long-Term Value That Goes Beyond the Installation in Long Island
Thermo-Seal installs doors that add long-term value to your Long Island home:
✔ Reduced heating and cooling costs thanks to better insulation
✔ Less maintenance with weather-resistant materials
✔ Improved property value through enhanced curb appeal
✔ Confidence in a job done right by fully certified professionals
We make sure you get the full value of your investment—day after day.
Why Choose Thermo-Seal for Door Installation in Long Island?
Since 1985, homeowners across Long Island have trusted Thermo-Seal for reliable, professional door installation. Here’s why we’re the go-to team:
✔ 40+ years of proven remodeling expertise
✔ No subcontractors—only full-time, certified installers
✔ Trusted partnerships with brands like Pella, Harvey, Andersen, and Therma-Tru
✔ Recognized credentials including GAF Master Elite certification
✔ Award-winning customer service praised by Angi and the BBB
When it comes to door installation on Long Island, we deliver with quality and care.
What is the average cost to install a door in Long Island?
Door installation costs on Long Island vary based on the door style, size, materials, and scope of the project. Entry doors may require extra framing, while French and sliding doors often involve more complex setup.
That’s why Thermo-Seal offers free in-home estimates across Long Island—giving you clear, custom pricing and honest recommendations.
What do you call someone who installs doors in Long Island?
Whether referred to as a door installer, carpenter, or contractor, the professionals at Thermo-Seal are certified, full-time experts. Our Long Island team is trained by leading manufacturers to ensure you receive a top-tier installation every time.
FAQs: Door Installation in Long Island
How long does a door installation take?
The time required for door installation varies based on the door type and project complexity. A standard replacement may be completed in just a few hours, while more customized installations—such as French doors or entry doors with sidelights—can take longer. Thermo-Seal’s team will give you a clear timeline during your free in-home consultation.
Can you install a new door in an existing frame?
Yes, in many cases, Thermo-Seal can install a new door into your existing frame, depending on its condition and size compatibility. However, for optimal results, especially in older homes, we often recommend replacing both the door and frame to improve energy efficiency, fit, and security.
What types of doors do you install?
We install a wide range of doors, including entry doors, storm doors, sliding glass doors, and French doors. We work with trusted brands like Therma-Tru, Andersen, Pella, and Harvey, offering materials such as fiberglass, steel, wood, and vinyl to match your home’s style and needs.
Do your door installations come with a warranty?
Yes. All of our door installation projects are backed by manufacturer warranties and Thermo-Seal’s own workmanship guarantee. We’ll walk you through the specific warranty details based on the brand and product you choose.
How do I schedule a door installation with Thermo-Seal?
Scheduling is easy. Simply call us at (866) 901-6808 or fill out our online form to request your free, no-obligation estimate. One of our certified professionals will visit your home, assess your needs, and provide a clear, upfront quote.
Ready to upgrade your home with professional door installation?
Contact Thermo-Seal today to schedule your free in-home consultation. Experience the difference that certified craftsmanship, premium products, and four decades of expertise can make.
Call us today at
(866) 901-6808 or
Contact us today to schedule a project consultation.
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Contact Info.
Phone Number:
Email Address:
Showroom:
456 Sunrise Highway, Rockville Center NY 11570 - (516) 689-7214
Rye Corporate Office:
411 Theodore Fremd Avenue, Rye NY 10580 - (914) 635-3748
Stamford Office:
263 Tresser Blvd., Stamford, CT 06901 - (203) 990-1812
Melville Office:
68 South Service Road., Melville NY 11747 - (631) 710-6937
CLIENT REVIEWS
What Our Clients Are Saying About Us
Thermo-seal Windows provides exceptional customer service alongside high-quality products. Recently, I had the majority of my home's windows replaced by Aaron's team, and their performance was nothing short of impressive. They arrived on time, maintained a tidy work area, and dedicated themselves to ensuring a perfect installation of the windows.
Aaron and his team were amazing, from start to finish! They worked with us every step of the way and Aaron was always just a call or text away to answer any questions we had. The windows are perfect and we love them. We highly recommend working with Aaron and his team. They are professional, courteous and their work is top notch!
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