Usable building area

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The building area is used in Germany as an energy reference area size for residential buildings in connection with the Energy Saving Ordinance.

It is determined as follows:

(heated building volume) [m³] = volume that is enclosed by the heat-transferring area A (determined according to EnEV 2009 , Annex 1 No. 1.3.1).

If the floor height h g is less than 2.5 m or greater than 3 m, the usable area of the building must be calculated as follows:

Energy reference areas in Switzerland and Austria

In Switzerland and Austria, the term energy reference area is used, which in residential buildings normally corresponds to the gross floor area ( including the surrounding walls). With storey heights of 3.125 meters, the usable building area is identical to the energy reference area on full storeys.

See also