Over the years, Illinois Home Improvement Corp. has established trusted vendor-distributor relationships with multiple Chicago building materials suppliers which allows us to provide a large selection of windows and doors quickly and affordably. Our long-term master carpenters have installed thousands of windows and doors throughout the years. When it comes to our customers, Illinois Home Improvement Corp. only selects the best products in the industry. Our indoor showroom contains many sample windows and doors, as well as multiple large portfolios featuring products from the highest-quality manufacturers.