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

From a customer in Tonawanda, NY

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The entire company provided exceptional service. I'll probably use them again.

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News and Events

Integrity Adds Enhancements to Wood-Ultrex Double Hung Window

FARGO, North Dakota, May 6, 2015 / PRNewswire -- Integrity Windows and Doors announced numerous enhancements to its Wood-Ultrex Double Hung windows. The Wood-Ultrex Double Hung Window by Integrity combines modern...

Marvin Introduces Contemporary Studio Collection

WARROAD, MN. April 27, 2015 /PRNewswire Marvin Windows and Doors has introduced their new line called Marvin Contemporary Studio, which is a selection of popular Marvin solutions with a contemporary design style...