In sub-project C02, a holistic methodology for the environmental sustainability assessment of reused concrete elements will be developed. This will enable environmental forecasts in the research of material-optimised secondary constructions in buildings as well as a multi-criteria evaluation of the respective component and the identification of combined sustainability criteria for evaluation models for classification. The aim is to utilise the potential of secondary resources while keeping an environmental sustainability in mind so that the developed construction approach, which takes advantage of reused concrete elements, in the end provides a better environmental footprint compared to traditional methods.