We’re still doing business, but without the risk.


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We would love to hear about your experience working with the experts at Big L. Write us a review and let us know how we did!

Get our Exclusive Total Trust Guarantee

When you buy new windows and doors from Big L, you can rest easy knowing our work and products are backed by our Total Trust Guarantee.

BNBEA Business Ethics Award Winner

Big L is honored to be the winner of the Buffalo Niagara Business Ethics Award, in the mid-sized company category. The BNBEA annual award event raises community awareness of ethical behavior and pays tribute to companies that consistently demonstrate ethical conduct in everything they do.

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.


The best home window replacement company in Buffalo and Western New York

Big L Windows & Doors in greater Buffalo, NY offers home window replacement & replacement doors featuring Marvin windows for homeowners & builders. 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.

We have a reputation for making a Big difference – a Big difference in sales, service, installation, and products.

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

View our window and door products and professional services.

News and Events

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