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Mixed use buildings

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Within the Energy Saving Ordinance (EnEV), all concerned buildings are differentiated according to terms of use as "residential buildings" or "non-residential buildings". On the other hand, different use patterns found in a single non-residential building are taken into account via "zoning" in course of the calculation method given in DIN V 18599.

In principle, all requirements apply to the building as a whole. This generally includes the issuing of energy certificates as well.
If a building contains residential- as well as non-residential uses, in several cases determined in § 22 EnEV the building should be treated as two separate buildings; this division includes the provisions about issuing energy certificates as well. The following cases have to be distinguished:

Predominant residential use

If a building predominantly is a residential building and the parts that are not for residential use are

  1. in terms of use
  2. with respect to their technical facilities
    considerably different from the residential parts and
  3. cover a not negligible part of the useful floor area of the building,

these parts of the building are treated separately as a non-residential building. All three of the aforementioned conditions have to apply. According to current interpretation partitions of up to 10 % are "negligible". Furthermore, the broad definition of "residential use" has to be taken into account: several types of dormitories and institutional homes (e. g. for elderly or handicapped persons) are considered as "residential buildings".

Predominant non-residential use

If a building predominantly is a non-residential building and the parts that are for residential use cover a not negligible part of the useful floor area of the building, these parts of the building are treated separately as a residential building. According to current interpretation partitions of up to 10 % are "negligible".

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