Energetische Sanierung von Bestandsgebäuden oder Neubau – Ökologische Bewertung hinsichtlich Materialbedarf, Primärenergieverbrauch und damit verbundenen Treibhausgas-Emissionen

  • Project no.352531
  • Duration 04/2021 - 11/2021

The promotion of the circular economy and the departure from the previous predominantly linear production and consumption patterns came to the fore at the political level with the European Commission's 2020 Circular Economy Action Plan and the German government's Resource Efficiency Programme. The building sector is gaining in importance both at European and federal level, as large quantities of raw materials are temporarily stored here over longer periods during the phases of use and accumulate as waste when the buildings are demolished. The project examines the ecological and economic impacts of energy renovation and modernisation measures as opposed to demolition and new construction of buildings.

LEG Immobilien SE as the project client provided a comprehensive data basis on its own refurbishment projects for the ecological and economic assessment. The Wuppertal Institute evaluates the two alternative scenarios "demolition and new construction" versus "refurbishment of the existing building stock" with regard to their material requirements, primary energy consumption and the associated greenhouse gas emissions.

The project is divided into four work packages:

  • In WP 1, the Wuppertal Institute analysed the material composition of three selected, unrefurbished buildings of the existing stock.
  • In WP 2, the project team modeled the demolition of the example buildings and their (replacement) new construction. Here, the quantities and composition of the demolition waste are determined and their treatment and recycling paths are analysed.
  • In WP 3, the scientists of the Wuppertal Institute modeled the energetic refurbishment and modernisation of these example buildings. In both WP 2 and WP 3, the researchers carried out a rough economic cost analysis for the respective measures in addition to the ecological assessment
  • In the final WP 4, the project team compared the results from WP 2 and WP 3 while taking into account the utilisation phases with different energy efficiency classes and heat supply technology.

Further project information


Project team



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