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60+ Locations Nationwide & Growing

The Window Source

The Window Source believes that local family-owned businesses, supported by industry leaders with more than 40 years of operating experience, are an ideal combination for a company that values providing high-quality customer service, exterior home-improvement products at the best prices possible.

About Us

The Window Source of St. Louis

Welcome to The Window and Siding Source of St. Louis

At The Window and Siding Source of St. Louis, we have firsthand knowledge about how much new exteriors can benefit your home. The right siding and windows can help to keep your energy bills affordable while dramatically increasing your property value.

Installing New Windows, Siding & More in

  • St. Louis
  • Oakland
  • Clayton
  • Ladue
  • Wildwood
  • Olivette
  • Frontenac
  • Glendale
  • And More!

The Window Source Products

Quality Products For Every Home

The Window Source of St. Louis: Energy-Efficient Windows, Patio Doors, and More

Whether you’re in St. Louis or a suburban location like St. Charles, The Window Source of St. Louis offers a wide variety of energy-efficient windows to replace the old ones in your home. Our experienced professionals can install new home windows, updated patio doors, and entry doors, or even replace the siding on your house to create an aesthetic that makes you feel happy to be at home. There are a variety of reasons to choose to install a new casement window, awning window, bow window, or a selection of picture windows in your home. Having excellent replacement windows is a good way to cut down on energy bills. In addition, it ensures your home is comfortable with an aesthetic you want to show off.

Reasons to Consider The Window Source of St. Louis for Window Replacement

There are several signs that it is time to replace your windows with new Energy Star models. Window replacements can cut your energy bills, give a new appearance to your windows, and even block out excess sound from outside. If your current window frames have cracked, the windows are hard to open, or you feel drafts, choose new replacement windows today. As the top window replacement company in St. Louis, The Window Source of St. Louis helps you determine which windows need to be replaced. Our experienced team can also provide you with a selection of window options that will increase your enjoyment of your home.

Vinyl Siding, Patio Doors, and New Home Windows in St. Louis

Windows are an important part of the home, but so are the doors and siding that make up the look of the home. We can install patio doors or entry doors and even replace your home siding to give a new look and feel to the home. If you’re ready to find out what improvements you can make with replacement windows, reach out to us today.

The WIndow SOurce Presence

Trusted With Homeowners Across The U.S.

Find your local Window Source location and experience why thousands of homeowners trust us with their most important investment.
  • "“The company to use if your needing window replacement, Fair pricing and honest fast work.”
    Tom R.
    Georgia
  • "Fantastic Company and true to their word! The crew was so professional and polite. We had our entire house of windows done and it only took 2 days..."
    Jennifer R.
    New Hampshire
  • "We had all the windows and the front and back exterior doors replaced in our home. It could not have gone more perfectly. The owner and the crew were all super nice and did a superb job. Very happy customers!!"
    Becky D.
    Oklahoma
  • “Excellent service, product, and less than half the price of the other 2 estimates I had. Installer cleaned up after himself and was very professional.”
    Ian G.
    Oklahoma
  • “Quality windows at an affordable price. Love our windows! Talked to several companies, but The Window Source offered top notch windows at the best price. Sales and installation crew were very nice, knowledgeable and professional. They did a great job.”
    M.K.
    Oklahoma

Window Source Q&A

Is it worth it to replace my windows?

Older windows are notorious for being leaky and inefficient. At The Window Source, we are constantly improving our technology to be more energy efficient. Installing new windows can realize up to an 80% return on investment when you sell your home. Coupled with the savings you’ll see on your energy bill, the cost of window replacement can often be quickly offset.

How do I know when to replace my windows?

Anytime you notice damage on your windows, it is a good time to have them looked at by an expert. Damage can be caused by water, insects, and father time. Your old windows ar inefficient, unattractive, and can cause damage to your home, call our experts today!

How much will it cost to replace my windows?

The best way to determine the cost is to contract a professional and receive an in-home estimate. At The Window Source, our estimates are FREE to you.

What types of payment methods and financing do you offer?

We offer a variety of payment methods and financing options. Please contact us to hear our options.

What Warranty do you offer?

Lifetime Warranty - All Window Source products come with a limited lifetime warranty. You will have peace of mind knowing that you will only make this investment in your home once. Ask your window consultant for details.

The Window Source Difference

More Than Just Windows, Doors, and Siding

The Window Source difference goes beyond premium products and professional installation. We're committed to delivering an exceptional experience from start to finish, backed by the resources of a national brand and the personal touch of local ownership. When you choose The Window Source, you're choosing a partner invested in your home's long-term performance and your complete satisfaction.
FIND YOUR LOCATION

The Window SOurce Locations

Ready to Transform Your Home?

With 60+ locations across America, there's a Window Source near you ready to provide a free, no-obligation consultation and estimate. Each location is independently owned and operated by professionals who live in your community, backed by the training, support, and quality standards of our national brand. Connect with your local team today and experience the Window Source difference.

  • Energy Efficiency Experts - We help you choose products that reduce energy costs and improve home comfort while qualifying for available rebates and tax credits.
  • Comprehensive Product Selection - From traditional to contemporary styles, we offer hundreds of options in windows, doors, and siding to match any home.
  • Local Accountability, National Backing - Your local owner is invested in your community's reputation, supported by the resources and standards of a national organization.
Get A Local Estimate