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 2019 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.

What Your Neighbors are Saying

Photo of window installation Northern Buffalo NY

Margarita – North Buffalo, NY

Photo of Chris Hamburg from Big L Windows & Doors

Chris – Hamburg, NY

Joan & Richard - Cheektowaga, NY

Finished entry door handle from Buffalo NY

Kimberly - Buffalo, NY

WELCOME TO BIG L WINDOWS AND DOORS

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

How To Install An Entry Door

Entry Door Installation There a number of reasons you might consider installing an entry door in your home. Perhaps your current door looks worn out or has become difficult to operate. Maybe it is not energy...

3 Reasons To Choose Infinity Replacement Windows

Infinity Replacement Windows Selecting the right windows for your home can feel like a daunting process. We're here to tell you why choosing Infinity replacement windows may be the right choice for your next...