Thank you for your support for the past 63 years! We would like to repay you with A NEWLY REMODELED SHOWROOM AT OUR CORPORATE AND NORTHSIDE LOCATIONS FEATURING OVER 70 DIFFERENT WINDOWS on display, including Bows, Bays, Garden Windows, and our full line of Platinum windows! Please use our showroom to introduce your clients to our many products.

Lang Insulated Glass Units

Did you know that Lang Exterior manufactures and sells Insulated Glass Units in addition to complete windows? Our customers can order IGUs with the same glass options as our windows, including grids, V-Groove, Enhanced Glass with Argon and Low-E and many more!

> How to become a Lang customer

Now Available: Aluminum Windows

Did you know Lang Exterior offers aluminum windows? Ultra Tuff aluminum windows are perfect for commercial or residential use and have an innovative thermal break that makes them unbeatable for interior comfort.

> See Ultra-Tuff Aluminum Double-Hung Windows           > Check Out Ultra-Tuff Aluminum Picture Windows

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How-To Videos by Lang Exterior

Learn how to clean the exterior of a Lang double-hung window. Learn about removing a sliding window sash and check out all of our other videos.

See Videos on Operating Lang Windows
More Videos: Inside Our Factories in Chicago, Illinois


Triple-Pane R5 Windows
U-Value .20!

R5 is the most energy efficient triple-pane option available.

Learn more about R5 triple pane windows and doors

View products with the R5 option:

Platinum Series
Powerweld Series
Renaissance Series
Glide Patio Doors