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Get in-touch with us

Fill out the form on this page, or give us a call at 716-895-8484. We’ll contact you promptly to assess the windows and doors in your home, and gather all necessary measurements from the exterior of your home. After our assessment, we’ll contact you via your preferred method of communication and present you with a variety of options customized for your needs.

Select your products

Our Big L Windows & Doors experts will help you select the right products for your home. Choose from Marvin and ProVia’s vast collection of products — including awning windows, casement windows, picture windows and more; as well as sliding, folding and swinging doors. Each window and door will be sized to your home’s specifications and installed in accordance with manufacturers recommendations.

We deliver on our promise!

After you make your decision, we’ll work with you to schedule precise measurements and installation of your project. Our Total Trust Guarantee is our promise that we will take care of you through every step of the process.

Schedule a Consultation

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Benefits of Big L


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 – it’s our promise to you that you’ll be completely satisfied for years to come.


Easy Financing Options

Big L, along with our partners GreenSky Credit, can offer easy financing plans to help you achieve your dream home. Tailor your window and door financing plan to fit your needs with our flexible terms, low interest options and payment plans that work best with your budget.


Expert Installation

Big L’s expert team of trained installers will help manage your project beginning from measurement all the way through delivery and installation, making sure your job is done right! No surprises, no hidden costs, no hassles.

Your neighbors and our customers in their words


Tina – Williamsville, NY

Edward – North Tonawanda, NY

Stephanie – Amherst, NY

We're here to help you

We at Big L Windows & Doors care for the safety of you and our community. With efforts to best serve our customers in the way that best suits your comfort level, we are offering free virtual appointments, in addition to our standard in-home or in-showroom appointments. Request your consultation today – either virtual or in-person – to discuss window and door replacement projects, and get a free quote.

Talk with our professional staff of window and door experts about the national brand products we carry—including Marvin and ProVia. Discuss their styles, materials and benefits so you can make an informed decision for your next home improvement project!

*Sale applies only to the purchase of Marvin brand windows, patio doors and Provia brand entry doors installed by Big L. Savings will be extended as follows: $100 off each Marvin Essential brand window purchased, $150 off each Marvin Elevate and Infinity brand window purchased, and $200 off each Marvin Signature brand window purchased. $500 off Provia entry door or Marvin patio door requires $5000 minimum purchase (before discount) to qualify. Offer expires 11/30/20