Servicing The Entire Chicagoland Area Since 1959. Key Decorating Service is an interior and exterior painting business that caters to the needs of commercial, residential, and institutional clients. We make customer satisfaction our number one priority! We service all of Chicago and surrounding suburbs. We specialize in • Interior / Exterior Painting • Paper Hanging • Plaster Repair • Drywall Repair For a painting specialist with over 50 years of experience, give us a call for your free estimate today!