Colorado Window & Siding (CWSI) has been delivering quality windows, doors, and siding solutions to Colorado homeowners and businesses for over 30 years. As a second-generation, family-owned business, we're proud to serve Denver, Boulder, and the Colorado Front Range. We provide both new installation as well as replacement services, and offer the widest range of products available at competitive prices to meet any need you have! We work with the best installation crews, which means that we can take on projects that most companies simply cannot.
Services
Our Story
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The story of Colorado Window & Siding Inc. (CWSI) started in 1983 when my parents, Bob and Diana Zimmermann, my brother Jason, and I moved from Michigan to Littleton, CO. With $2,000.00 in savings on arrival in Denver, Diana got employment with Martin Marietta, Bob started pounding the pavement door to door looking for customers for our new company, and my brother and I started school.
Windows
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Colorado Window and Siding is proud to offer the Weather Shield line of wood windows. With a wide range of products, sizes, options and price points, Weather Shield is a leading manufacture of elegantly designed, energy efficient wood windows. Several products in our Weather Shield line are Energy Star qualifying, allowing you to take advantage of the Federal Energy Tax Credit.
Siding
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Charter Oak siding receives it basic strength and weather resistance from PureStrength PVC resin. It prevents moisture infiltration from rain and humidity, so panels will not rot, warp, shrink or swell. The result is low-cost, easy-care maintenance. Charter Oak's beautiful surface is protected from ultraviolet degradation, so even the hot summer's sun will not damage it.
Doors
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Proven fiberglass durability captures the look and feel of natural wood in 6'8 tall and five new 8' tall Classic-Craft door styles. This door collection complements the style of Southwestern and European country architecture. The Therma-Tru Finishing System offers all the popular stain colors including oak, walnut, cherry, cedar, and antique white plus NEW Mahogany. Whether you pick standard sliding patio doors or French sliding patio doors you will have a host of options that will make each door uniquely yours.
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