Best Price GuaranteeThe Window Source
Servicing MO & IL Clients
(314) 325-8547
(618) 216-6677
Best Prices Guaranteed
Affordable and Custom-Made Windows and Siding

Free Second OpinionBest Price Guarantee

Contact Us to Request Our Services Today


Window Company in St. Louis

Improve your view of the outside world by installing new home windows. Trust the experts at our window company in St. Louis for affordable window sales, and replacement. We offer unparalleled services, high-performance windows, and competitive prices. Add value to your home and lower your energy bills when you depend on The Window Source.

We are a locally owned and operated company that installs quality windows as well as siding. Both products are custom manufactured to suit your needs and style. All of our windows are ENERGY STAR rated and come with a lifetime warranty. You'll be impressed with how our energy-efficient windows transform the look and feel of your home from the inside out. Some of the windows we install include:

  • Basement Windows/Hoppers
  • Awning Windows

A Local & Reputable Window Contractor

Depend on a trusted local home window contractor when you need to replace your windows. We are the area's premier source for replacement windows, because we pay close attention to detail, provide customized services, and dedicate ourselves to your complete satisfaction. In addition, you can always expect honest and open communication when you deal with us. Rest assured your new home windows will be expertly installed for the right fit every time.

Low Prices for Home Windows

Do you need a second opinion? If you've already gone to another window company to get a quote, come to us for a free second opinion. We know you will be pleasantly surprised by our prices and impressed with our services. Whether you want to replace one window, several home windows, or all the windows in your home, you can depend on us for options that cater to your needs and budget. In fact, we guarantee the lowest prices around for window replacement, and installation.

House with New Windows and Siding in St. Louis

Best Price Guarantee for Premium Windows

Make the right choice by choosing our window company. We are so confident that you will love our windows and our prices that we back our promise with a Best Price Guarantee. If you find a better price on the same window anywhere else, we'll refund you the difference. As a reputable window contractor, we are known for our exceptional products and customer service. Allow us to offer a free estimate and show you how you can save on new windows in your home.

Contact us for more information about our lifetime warranty. We proudly serve clients throughout St. Louis, St. Charles, Chesterfield, Fenton, and Manchester, Missouri, as well as the surrounding areas.

Add curb appeal and value to your home with
help from our window and siding company.
Call (314) 325-8547

Contact Us in St. Louis

Thank you for your interest. For questions or comments, please use the information listed here. We look forward to hearing from you soon.

(314) 325-8547

Hours of Operation
Monday - Friday, 9 a.m. - 6 p.m.
Saturday, 10 a.m. - 2 p.m.

Service Area
St. Louis, St. Charles, Chesterfield, Fenton, Manchester, Kirkwood, Webster Groves, St. Peters, O'Fallon, Ballwin, and Ellisville, Missouri


Over 40 Locations Nationwide ENERGY Star Certified GreenSky, Logo
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