Integrity Windows and Doors from Marvin—the long-lasting, energy efficient, virtually maintenance-free solution for all your window or door needs. Now, the Wood-Ultrex series includes the new 4 Panel Sliding French Door. Learn More >>

Bring a fresh, modern look into your home with Marvin’s new contemporary products, featuring strong, clean lines and larger glass areas on windows and doors. Learn More >>

Marvin builds the windows that define your personal aesthetic and achieve your standards for beauty and quality. Learn More >>

Built to perform.® More strength, durability and performance are offered by Integrity® from Marvin All Ultrex® Series. Learn More >>

As you select a new entry door system, rest assured that Therma-Tru® has the right door to meet all your needs. Learn More >>

Super Service Award Winner

Choosing a replacement window can be daunting, but let the pros at Big L Windows and Doors guide you!

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Proud Guild Quality Member

See what the Guild Quality Community is saying about Big L Windows and Doors.

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Welcome to Big L Windows & Doors

The Best in Windows and Doors for Buffalo and Western New York

If It’s a Window or Door, Our People Know More

Welcome to Big L Windows & Doors, your first choice for high quality Windows and Doors. Our extensive selection of cutting edge products deliver unmatched beauty and state-of-the-art performance for energy savings, reduced maintenance and a more comfortable home.

Big L Windows & Doors delivers a wide array of custom-made styles, decorative options, complementary trim selections and performance packages for a fully customizable solution to suit your individual needs.

At Big L Windows & Doors, we have a reputation for making a Big difference – a Big difference in sales, service, installation, and products.

Big L’s professional approach, highly trained staff, and affordable pricing will help take the stress and confusion out of your new project.

What Our Customers Say

Testimonials for Big L Windows & Doors

Valued Window and Door Installation Reviews from Our Western New York Family

“I would like to recognize the entire team. They did a great job. I was most satisfied with the level of quality of talent and number of people on the job. I was also satisfied with how well they worked as a team and their professionalism.”

-Dan, Amhers...

News and Events

The Integrity 4-Panel Sliding French Door

Big L Windows Now Features the Integrity 4-Panel Sliding French Door June 25th, 2014 For those who need a strong, tough door, but crave expansive views, Integrity Windows and Doors offers the perfect solution:...

Big L Windows & Doors to Support Veterans

Big L Windows and Doors Distributor Now Offers “Thank-A-Vet” Discount on American Made Products Erie County, NY- Erie County Clerk Chris Jacobs announces that Big L Windows and Doors, located at 2727 William...