The auditorium of the Sand du Plessis Theatre (1985) is unique in South African theatre architectural design. Provided with continental seating (no centre aisle), and separate entrances for various rows, the auditorium has no distinct balcony but is divided into four staggered seating areas, each giving its occupants a sense of intimate surroundings, while together (viewed from the stage) giving the impression of space and majesty. The auditorium has 964 seats.
Care has been taken to provide areas in the auditorium where wheelchairs may be brought in.
For smaller productions, the auditorium can be subdivided by hanging a curtain, which decreases the number of seats to approximately 450.
The walls of the auditorium are covered with acoustically designed embuia panels, which, as part of their acoustic function, imbue the space with warmth and visual interest.
The colours of the wooden material covering the seats, the vinyl floor covering and the main stage curtain, have been chosen to blend with the embuia panels. Together they create an interesting visual effect.
A guest area in the centre of the auditorium is served by a private lounge behind it, leading to the main foyer.
The Theatre is the venue throughout the year for opera, ballet, drama and concerts.