A room is a space in a dwelling, separated from other spaces by fixed walls from the floor to the ceiling, with an area of at least 4 square metres, with direct day lighting, i.e. with a window or a French window in an external wall of the building; kitchens are also considered rooms as long as they fulfill the above criteria.

Corridors, halls, bathrooms, toilets, larders, verandas, porches, storerooms, etc. are not considered rooms irrespective of their area and lighting.