Gross volume

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The gross volume (BRI) is a term that defines the volume of a building . In Germany it is calculated on the basis of the DIN 277 standard , in Austria on the basis of ÖNORM B 1800. The BRI is given in cubic meters .

An important key figure for a building project can be calculated with the gross volume : the price per cubic meter. The gross volume is also part of the lending documents and is required to determine the value of the building ( valuation ). A lender uses this to calculate the mortgage lending value . This is decisive for the amount of a building loan to finance a property.

The ratio of the gross volume to the living space is called the expansion ratio .

Note: The term enclosed space is still used in many cases, but has been replaced by gross volume in DIN, but is not to be equated with. The enclosed space is defined in the II. Calculation Ordinance and is calculated differently than the BRI.

Definition of DIN 277-1, as of January 2016

According to DIN 277-1 (as of January 2016), the gross volume (of buildings) is the volume of a building, limited by the outer boundary surfaces of the building, formed by the lower surface of the structural floor (underside of the sub-floors and floor slabs, which are not the foundation serve), the outer edges of the external walls and the surface of the roof coverings, including dormers or roof skylights.

Does not include:

  • Deep and shallow foundations;
  • Light shafts;
  • External stairs and external ramps not connected to the building by building structures;
  • Entrance canopies;
  • Roof overhangs, unless they represent overlaps for the volume of the area (S) according to 5.6.2;
  • cantilevered sun protection systems;
  • Chimney heads, ventilation pipes or ventilation shafts that extend beyond the roof covering;
  • Skylights ≤ 1.0cbm;
  • Pergolas and paved outdoor seating or terraces.

Investigation rules

The gross volume (BRI) is to be determined from the determined gross floor area (GFA) and the associated heights. The heights for determining the gross volume (BRI) are the vertical distances between the surfaces of the ceiling coverings in the respective floor plan levels or, in the case of roofs, the surfaces of the roof coverings.

For the lowest storey of the building, the height is the distance from the underside of the sub-floors and floor slabs, which are not used for the foundation, to the upper side of the ceiling covering of the floor plan above.

In the case of structures or parts of structures that are delimited by non-vertical or non-horizontal surfaces, the volume must be determined using appropriate geometric formulas.

The upper edges of the delimiting building structures (e.g. parapets, parapets, railings) are decisive for the heights of the volume of the area S (special case of room enclosure according to 5.6.2).

Definition of ÖNORM B 1800

According to ÖNORM B 1800, the gross volume (of buildings) is the volume of a building, limited by the lower surface of the structural floor and the outer boundary surfaces of the building.

Does not include:

  • Foundations
  • Subordinate components, for example design and construction projections and recesses on the outer surfaces, cantilevered sun protection systems, skylights, chimney heads, roof overhangs (provided they are not a limitation of the BRI)
  • Components insofar as they are of minor importance for the BRI, for example cellar light shafts, external stairs, external ramps, dormers (after the revision of February 2005, dormer windows are to be included), entrance roofs

See also

Web links