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The Energy Saving Ordinance (EnEV) sets up requirements applying to the energy performance of buildings under construction. The requirements are different for residential and for non-residential buildings.

In addition, there are several rules that apply to both kinds of buildings:

  • § 5 sets up special regulations about taking into account electricity from renewable sources (mainly photovoltaic) produced in the vicinity of the building and used by the building’s services.
  • § 6 sets up the basic requirement to construct the thermal envelop airtight according to commonly approved technical standards. On the other hand it is made clear that sufficient air supply has to be ensured for the purposes of health and heating appliances. Referring to Annex 4 of the ordinance, a good airtightness can be taken into account in the calculations to prove compliance with the required energy performance. The rules in Annex 4 differ from those in technical standards, since the tightness in the status of the finished building shell is relevant, means: significantly before the building is totally finished.
    The regulation in § 6 is sometimes wrongly interpreted as an obligation to install mechanical ventilation systems in every new building. Even if such systems are recommendable in most cases, they are not compulsory according to the EnEV
  • § 7 sets up rules concerning minimal thermal insulation and the basic rule to reduce the influence of thermal bridges. Concerning the way to consider the remaining influence of thermal bridges, the ordinance refers to the compulsory calculation standards, but considering that a proof of equivalence of a chosen own solution can be omitted when – because of a good insulation of adjoining components such a proof is methodically not applicable.
  • § 8 sets up special provisions for small buildings (up to 50 m²) and for temporary buildings constructed using certain prefabricated modules.
    [more about special provisions]
  • § 14 sets up requirements for the configuration (controls, pipe insulation) of heat distribution systems and domestic hot water systems, applying to (among others) new buildings.
  • § 15 sets up requirements for the configuration and design of AC- and ventilation systems, applying to (among others) new buildings.
  • § 22 sets up rules for the case, that a building is partially used as residential and partially as non-residential building.
    [more about mixed-use buildings]
  • § 28 sets up rules for transition from the former status of legislation to the current (i. e.: date of validity of new provisions).
    [more about special provisions]

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