Come find out how the experts at Big L Windows and Doors can help add curb appeal to your home by replacing your windows and doors. Combining the best quality materials with our experienced staff, Big L is western New York's window replacement leaders. See our Before and After's >>

Come find out how the experts at Big L Windows and Doors can help add curb appeal to your home by replacing your windows and doors. Combining the best quality materials with our experienced staff, Big L is western New York's window replacement leaders. See our Before and After's >>

Our May Project of the Month is the Hunt Real Estate Office expansion in Buffalo, NY. Take a look at the products we used in replacing this office's windows. Learn More >>

Rest assured that your products and installation services are covered with Big L's Total Trust Guarantee. We offer the utmost responsibility for the products and services we offer. Learn More >>

Hassle-Free Financing Options

We make it easy to realize your dreams today! Big L offers a variety of great financing options including "same as cash" financing with no interest and no payments for one year.

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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.

Customer Reviews

What our customers say
Patrick H. in West Seneca, NY
They were very professional and knowledgable!


View all feedback from Big L Windows & Doors

News and Events

Therma-Tru’s “Door Do-Over Week” is August 3-7, 2015 – includes Sweepstakes!

Maumee, Ohio (PRWeb) July 23, 2015 / Therma-Tru is sponsoring "Door Do-Over Week" from August 3-7, 2015. Door Do-Over Week is where experts can answer important questions and offer insight to homeowners who are...
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Therma-Tru Classic Craft Collections Named Repeat Best Buy Winner by Consumers Digest

MAUMEE, Ohio, July 6, 2015/PRNewswire/ -- For the second consecutive time, Consumers Digest named Therma-Tru's Classic-Craft® line of energy-efficient entryways as a Best Buy selection in the fiberglass entry...
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