We investigate whether mandatory energy performance certificates of existing residential properties contribute to property price premiums after the implementation of the EU directive on the energy performance of buildings in the Swedish private housing market. Analysing mandatory energy performance certificates of the 2009–2010 private housing transactions, we find that energy performance is associated with transaction price in situations when it is conditional on a reference benchmark. We also document property price premiums for energy performance within housing segments built before 1960 and those with a lower transaction price per square metre. Our results suggest that the property market values energy performance, and we make recommendations on which housing segments need policy support to encourage energy improvements. Copyright © 2014 John Wiley & Sons, Ltd and ERP Environment.