Upgrading the existing housing stock to a more sustainable and less energy demanding sector is a current issue. With a view to the European 20-20-20 target and the increasing energy prices, the sustainability and energy performance of people’s dwellings become indispensable. Until today still a significant portion of the housing portfolio has a weak energy performance. The cause for this postponement of sustainable renovations is often associated with high investment costs. This research attempts to link a new way of investment with an innovative renovation concept. This requires solving a complex combination of varied subjects such as engineering capabilities, energy performances and financial structures, but also residents’ interests and their willingness to pay, risks and opportunities, functions and actors are elaborated in this report.