Big L is celebrating 40 years of providing Western New York with the best window and door products available, and matching it with unbeatable quality service. See the video>>

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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Welcome to Big L Windows & Doors

Best replacement windows in Buffalo and western New York State

Big L Windows & Doors in greater Buffalo, NY offers replacement windows & 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.

Customer Reviews

Rob Smiley
Rob Smiley
21:57 23 Mar 17
One of the best companies I've ever dealt with great customer service and great installation from beginning to finish the installers did a great job and kept it real clean
Mike Santoro
Mike Santoro
18:05 24 Sep 16
one of Buffalos oldest continually ran window and door installers with a good track record. Just installed windows on my customers home and did a swift, neat and professional job
jeff worden
jeff worden
17:50 06 Jul 16
Big L claims to be the only place locally that carries Marvin windows, and so they advised that we need to pre-order and put a deposit down on replacing a vandalized window. We have left them multiple messages with no contact back over the past couple of weeks. There service is terrible, and considering this was an incident of no-fault to us, you'd think they would take pride and deliver good customer service. It's a pathetic way to run a business, and I will certainly be advising friends to not give them any business.
Egon Moldenhauer
Egon Moldenhauer
12:27 29 Jun 16
Rinki Maurya
Rinki Maurya
23:55 15 Sep 15
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News and Events

Promoting Wellbeing With Accessible Homes

When envisioning the perfect home for their family, Kiley and Jim agreed that accessibility was paramount—access to the outdoors, and access for their daughters, Langley and Boelyn, who have special needs and...
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Union Stables Case Study

Built in 1909, the 63,768-square-foot, four-story heavy-timber and masonry building stood silent for decades, tantalizing Ed Weinstein, FAIA, with a wealth of adaptive reuse possibilities to revive this landmark...
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