The house is a mostly mid-18th-century neo-Gothic design. Designers who worked on the house include William Adam and Roger Morris; the interior includes a number of neoclassical rooms created for the 5th Duke by Robert Mylne. These are among the rooms open to the public. The 13th Duke and his family live in private apartments occupying two floors and set between two of the castle's crenellated circular towers. Recent renovations included the installation of the house's first central heating.