Why Choose Lang Windows and Patio Doors?

Oldest Vinyl Window Manufacturer in the Midwest

How many window manufacturers can say they have been in business since 1953? Lang Exterior can.
Learn More about Lang Exterior's history

Quality and Strength

We at Lang pride ourselves on the quality in every detail of our windows, and from the virgin vinyl that we extrude ourselves to our advanced fusion welding process to the great number of other features that go into a Lang window, we believe in our products.

Lower Price Guarantee

We will beat any price on a comparable window by 10%.* That's our lower price guarantee and it proves our dedication to "the best product at the best price."

* Ask for details

Black Vinyl Windows

Lang now has a really remarkable vinyl window color offering: BLACK. We offer black inside and out in pure vinyl form, unpainted! We also offer windows with a black exterior and a white interior, and, again, this is still unpainted, extruded vinyl only!
More about black windows

Color and Finish Choices

We know how important colors and woodgrains are, and we give you over 30 combinations, including bronze and clay. We are the only company that offers bronze inside and out.
View all color combinations
More about Lang woodgrain finishes

Grids and V-Groove Glass

We offer Grids as well as V-Groove glass, and of course we give you a lot to choose from, with over a dozen patterns of each! Click below for more details.
Grids - More Info
V-Groove Glass - More Info

Energy Efficiency

With energy efficiency ratings as high as "R5," Lang windows and patio doors help reduce energy use and lower heating and cooling bills.
Learn about R5 windows and patio doors from Lang
Browse windows

Custom Built

We do not limit you to stock sizes - all of our windows and patio doors are custom made in our factory and can be ordered in 1/8" increments.

American Made

Not only do we manufacture the products we sell, we also make our windows and patio doors right here in Chicago, Illinois!
Learn how Lang products are made entirely in America

Fast Lead Time

In most cases your windows are made within 3 to 5 business days!* Because we make our windows in our own factory right at our location, there is no added delay.

* Depending on season

Matching Laminated Trim

When you buy a woodgrain-finished window, you want the interior trim to match. Lang Exterior can make the trim for you, in the same finish as the window.
See all laminated trim styles.

Customer Service

Call or stop by one of our locations and we know you will find our customer service friendly and knowledgeable. We strive for customer responsiveness that is as innovative as our windows.

Available Nationwide

If our Chicago locations are not convenient for you, we can ship to most addresses nationwide.

Window Repair

Bring in your broken vinyl sash or window by 8 am, you will have it back by 3:30 pm! Lang Exterior offers this service directly to the public.
Learn more about Lang's expert vinyl window glass repair/reglazing

Open Six Days a Week

Are we open Saturdays? Yes! Lang Exterior always goes the extra mile to serve you.
View hours and locations.