Carpet Area: This is the area of the apartment that does not include the area of the walls i.e. the area of the apartment that a carpet can cover.
Built-Up Area: This is the area of the apartment that includes the area covered by the walls.
Super Built-Up Area: This includes the built-up areas such as the vestibule, hoists, stairs etc. This word is therefore only applicable for multi-dwelling units, such as flat complexes.