Large buildings also tend to generate steep energy bills in most cases. A proper retrofit should therefore reduce consumption and thus the bill. However, energy-saving measures don't always produce the expected results and a performance contract can address this. A performance contract lays down the envisaged energy reduction in a binding agreement with the contractor. The aim of this breakthrough project is to assemble a consortium of building owners in Leuven who put a large-scale performance contract on the market. In this way, we want to substantially bring down the energy consumption of non-residential buildings in Leuven.