Window World
Southern Illinois - Mt. Vernon

Window World of Southern Illinois, a subsidiary of Sun-Tec, Inc., has been serving the Southern Illinois area since 1994. We take pride in being a part of the rich heritage and history of this area. We have three locations to serve 28 counties, with offices in Centralia, Mt. Vernon, and Marion, IL.

We also take pride in the quality of the products that Window World has provided to its national network of dealers. Our “Simply the BEST for LESS” is more than a slogan, it’s Window World’s promise to our customers.

As part of America’s largest replacement window company, we have access to incredible buying power on high quality windows and siding that many competitors don’t have. We are “THE ORIGINAL $189 WINDOW COMPANY”. Many companies try to copy our advertising and pricing, but they aren’t able to copy our quality for our price. That’s why we offer our “100% guaranteed low price” program.

Window World of Southern Illinois can help you save on heating and cooling costs, time and maintenance while increasing the value of your home by installing Energy Star approved windows and Prodigy R-5.3 rated siding. In fact, Window World Inc. has been named an Energy Star Corporate Partner.

We offer a complete line of windows including double-hung, slider, picture, casement, bay, bow, and basement windows, endorsed by Good Housekeeping, and our installers are factory certified.

We also carry Comfortworld siding in beautiful colors and styles, soffit, fascia, and the newest PRODIGY siding, the ONLY R-5 and R-5.3 rated engineered, insulated siding panel available today!

Want to add a beautiful new sunroom or conservatory to your home? Window World of Southern Illinois can do that too, along with patio and entry doors, to complete your home makeover!

Member of NARI (National Association of the Remodeling Industry), Centralia Chamber of Commerce, Salem Chamber of Commerce, Mt. Vernon Chamber of Commerce, and Marion Chamber of Commerce.

Centralia Office: 539 S. Poplar St. Centralia, IL 62801 Phone: 618-532-1189

Mt. Vernon Office: 227 S. 10th St. Mt. Vernon, IL 62864 Phone: 618-246-0189

Marion Office: 303 N. Carbon St. Marion, IL 62959 Phone: 618-997-0189

Showroom/Office Hours: Monday through Friday 7:30 am – 4:30 pm. Hours may vary by location. Also, by appointment after hours and on Saturday.

Forms of Payment Accepted: Cash, Personal Check, Visa, MasterCard, Discover or American Express. We also offer several financing packages with approved credit.

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