Darmstadt, Germany. Low operational costs for heating and electricity and a high standard of living comfort are possible at the same time: the latest session of the Research Group for cost-effective Passive Houses addressed the issue of social housing and how it can be implemented in a cost-effective and energy efficient manner. During an associated excursion, many parti-cipants visited the PassivhausSozial-Plus in Darmstadt which is a nationwide model project for social housing.