Every workroom should have sufficient floor area, height and unoccupied space (Regulation 10). The ACOP says that, as a minimum, 11 cubic metres should be allowed per person working in a room, discounting any room height over three metres. HSE guidance says that the number of people who can work in any room at the same time will depend on the size of the room, the space taken up by furniture, fittings and equipment, and the layout of the room.