Zum 1. November 2020 hat das Gebäudeenergiegesetz (GEG) das bisherige Energieeinsparungsgesetz (EnEG), die bisherige Energieeinsparverordnung (EnEV) und das bisherige Erneuerbare-Energien-Wärmegesetz (EEWärmeG) abgelöst. Aus diesem Grund wird das Bundesinstitut für Bau-, Stadt- und Raumforschung das Infoportal Energieeinsparung in Kürze an den neuen Rechtsstand anpassen. Die Arbeiten dazu laufen mit Hochdruck. Der neue auf das GEG umgestaltete Internetauftritt wird innerhalb der nächsten Wochen zur Verfügung stehen.

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Economic assessment – basic information

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In order to assess the economic advantageousness of energy modernisation, benefits (lower energy consumption) are compared to the costs of the modernisation measures.

Adapted to the planning status and the data available, economic assessments can be carried out based on estimations or detailed. The way in which expenses and savings are determined has a considerable impact on the result and comparability of economic assessments.
In addition to suitable methods, accurate marginal conditions must be chosen in order to be able to assess the cost effectiveness of energy modernisation measures properly. The pages in this section provide an overview for the following key areas:

Although the illustrations and examples focus on residential buildings, the considerations also apply analogously to non-residential buildings. In this case, for some measures, not only the energy demand for heating and DHW plays a role, but also the energy demands for ventilation, air conditioning, and lighting.

For the assessment of economic reasonability, both monetary facts as well as further effects and benefits of modernisation measures should be taken into account. Housing comfort, accessibility, absence of hazardous building materials, and the raise in the building’s value are not always or only indirectly in-cluded in calculations of cost effectiveness. Nonetheless, these should be important decision criteria for long-term future investments in real estate.

The contents of this section to a large extent follow proposals elaborated for this purpose under a BBSR research contract by a consortium of

  • Dr.-Ing. Günter Löhnert
    sol·id·ar planungswerkstatt berlin
    (leading contractor)
  • Institut Wohnen und Umwelt GmbH (IWU), Darmstadt
    Dr. rer. pol., Dipl.-Volkswirt Andreas Enseling
  • Bau-, Energie- und Umweltberatung, Weimar
    Prof. Dr. habil. Thomas Lützkendorf.

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