About XL Building Products

Your window to opportunity!

Since 1997, XL Building Products has proven itself as the premier window and door wholesale distributor in the St. Louis and Bi-State area. Known for our exceptional customer service and unmatched knowledge and experience in the window and door industry, we are the preferred distributor for area contractors and home builders.

At XL, we understand that selecting windows and doors can be challenging. We provide comprehensive solutions for new construction, replacement, custom and historic applications. You can rest assured knowing that our experienced associates will work with you in the selection process giving you the “Good-Better-Best” recommendations that you need to determine the best-valued option for your project, style preferences and budget.


We look forward to becoming your supplier of choice. Explore and learn about the window and door products we have to offer. Contact XL Building Products in St. Louis today to get complete product information and a quality, value-based bid on your next project!

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