Number of building floors

The number of floors of a building includes all floors above ground (including technical floors, attic floors) and semi-basement floors, excluding the attic floor.

NOTE: The attic floor is not included in the number of building floors when it only serves the function of enclosing the stairwell/elevator shaft and shielding the technical equipment of the construction (if any), with the area of the attic roof not exceeding 30% of the roof floor area.