American Made Vinyl and Aluminum Windows

Lang Exterior vinyl and aluminum windows and patio doors are entirely made in the United States.

Lang opened for business in 1953 in Chicago, IL, and all of our factory production is still done in Chicago today. Lang Exterior not only extrudes its own custom formulated premium vinyl profiles but also does vinyl lamination and fabrication of many other parts that go into our products.

See more in the videos below.


Lang Fabrication of Small Parts

This video shows how even the smallest parts in Lang Exterior's products are made in-house.


Insulated Glass Unit Production

At Lang Exterior, we not only manufacture our own vinyl and aluminum but we also make all the insulated glass units that go into our windows and patio doors. This video shows part of our insulated glass production line.