To calculate the total main or living area of a property, the individual areas of the following rooms are added together: Entrance, living, dining, WC, bathroom, kitchen, built-in kitchen furniture, storage rooms, built-in cupboards, corridors, internal staircases, offices, stoves and fireplaces. Winter gardens may also be included in the living space, provided they are habitable and heatable throughout the year.

However, ancillary areas such as balconies, unheated conservatories, terraces, garages, attic, cellar, handicraft and bicycle rooms may not be included.