Key legal question
What counts as a privileged attic floor under § 17 bis KBV?
Extracted holding
A privileged attic floor exists only if the storey is built into the roof truss, with a roof slope or a reduced floor area compared with the storey below.
Extracted reasoning
The provision and its materials show that only true roof-integrated attic conversions are exempt from floor-number and floor-area counting; a storey outside the roof space is not an attic floor.