In the past decades, significant achievements in energy efficiency have been made. However, these have not materialised in significant reductions in absolute energy demand, because efficiency gains were compensated by the introduction of new energy-consuming technologies, functions, applications, additional desires and increasing production and services. This project therefore addresses the question how energy demand in the building/living sector can be limited. To this end, the current state of research is discussed first. In a second step, sufficiency behaviour is analysed and strategic sufficency approaches an their acceptance tested. This will be done in the fields appliances, household energy consumption and urban services. Several methodological approaches are used: Design Thinking/Open Innovation workshops, focal groups, surveys and further data collection. From these empirical insights and an analysis of barriers and incentives, governance guidelines are drawn and integrated policy approaches developed. Finally, legal feasibility will be assessed. In the context of the Wuppertal Institute's Transitions Research, this project focuses not only on the aspects efficiency and consistency, but especially on sufficiency which turns out increasingly essential for reaching the political energy targets.