Gross floor area

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The gross floor area is used in Austria as a synonym for the gross floor area (GFA) defined in DIN 277 . In Germany, its use is incorrect and is often confused with the floor area .


The term is not used in the Building Utilization Ordinance and DIN 277 , but the wrong use is very persistent. Strictly speaking, the use of the word gross in combination with floor area is superfluous, since the latter already includes the sum of all areas of each floor by definition. In terms of the base area, however, a distinction can be made between construction and net areas.


In Austria, the term is defined in the building laws of the individual federal states. In the Styrian building law, the gross floor area is “the area per floor that is enclosed by the external walls, including the external walls” . This corresponds to the gross floor area of ​​a floor according to DIN 277. Municipalities can change the definition by ordinances. In the municipality of St. Kanzian am Klopeiner See, “The gross floor area is the area of ​​each storey that results from the measurement of outer wall to outer wall, with terraces and balconies as well as open sun protection roofs on three sides not included in the calculation. That part of a floor that protrudes more than 1.50 m from the primeval terrain is to be included in the calculation. "

The calculation of the gross floor area is specified in ÖNORM B-1800.


See also

Individual evidence

  1. Text of the Building Use Ordinance
  2. Styrian building law - Styria. BauG
  3. Ordinance of the parish council of St. Kanzian am Klopeiner See ( Memento of the original from October 20, 2007 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. dated April 4, 2003  @1@ 2Template: Webachiv / IABot /
  4. ÖNORM B 1800 - Determination of areas and volumes of buildings ,