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Net floor space
According to SIA 416 (ordinance of the Swiss Institute of Engineers and Architects), net floor space (Nettogeschossfläche – "NGF") is the part of the overall floor space (Geschossfläche – "GF") lying between the perimeter walls and the interior construction elements.
Net floor space is categorised into usable space (Nutzfläche – "NF"), transit or access space such as corridors (Verkehrsfläche – "VF"), and functional space (Funktionsfläche – "FF").
