Interior Design Firm in Scottsdale, Arizona Est Est Inc, established in 1959, is the oldest interior design firm in Scottsdale, Arizona. It has enjoyed distinguished recognition in the local luxury residential and commercial interior design fields, as well as with private clients and contract projects throughout the Southwest, Scottsdale, Phoenix, Paradise Valley, Sedona, Pinetop, Prescott, Payson, Flagstaff and Tucson. Est Est Interior Design has also had the opportunity to work on several projects across North America, Mexico, and Europe.