Welcome to Hidden Doors By Design LLC. Best of Show Award - 2014 Denver Home Show Meticulously crafted, expertly engineered hidden door bookcases with concealed 115 lb. steel structural systems designed by a structural engineer. No hinges, tracks, or rollers! We have left and right in-swing or out-swing models, custom sizes, designs, woods, cabinet doors, and drawers. Flush with wall closure and deep shelves for heavy books and optional commercial magnetic locking systems with remote activation and concealed security panels. Trust us for truly exquisite fine furniture quality. Give us a call today!