Enclosed space

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The enclosed space (UR) is an outdated term for the cubature (volume) of buildings .


The term was defined in DIN 277 from 1950. This standard has since been changed, the term “enclosed space” has been replaced by the term gross volume (BRI) . Nonetheless, the term “enclosed space” is still widely used today in expert services for profitability calculations and market value appraisals (e.g. for determining the mortgage lending value). In addition, the term is now used as a synonym for the gross volume both in linguistic usage and in specialist literature.

Calculation according to DIN 277 from 1950 (outdated)

The enclosed space was calculated as follows:

  • Basically, length × height × width of the external shell dimensions are calculated.
  • The height is calculated from the upper edge of the basement floor. (Obsolete - according to the new DIN277 UK floor plate)
  • In the case of buildings without a basement, calculations are made from the surface of the site.
  • If the attic floor has not been developed , the height to the surface of the floors above the top floor is calculated.
  • In the case of a converted attic, the calculation is made up to the outer surface of the enclosing walls and ceilings, without roofing
  • If there are different floor plans, the individual floors must be calculated separately.
  • Only one third of the undeveloped roof space is included. (Obsolete according to the new DIN 277)

The following were not charged separately:

  • Dormer windows and structures up to 2 m² visible area (outdated - according to the new DIN 277, dormers and skylights are to be included in BRI regardless of their size)
  • Balcony slabs and canopies up to 0.5 m projection
  • Roof overhangs and cornices , individual steps in front, wall columns and pillars
  • normal foundations

In the case of the enclosed space, the following components, which must be specially assessed, were also not taken into account:

  • unusual foundations (e.g. pile foundations )
  • water pressure retaining seals
  • Balcony and terrace balustrades
  • Balcony slabs and canopies> 0.5 m projection
  • Outside stairs
  • free-standing chimneys
  • Roof structures and dormers with> 2 m² visible area
  • Pits and canals.


If the enclosed space is to be calculated from an indication of the gross room volume, the following rule of thumb can be used:

  1. Remove all areas that are not covered or not completely enclosed
  2. Subtract 2/3 of all parts of the attic that have not been removed