Many modern office buildings have highly glazed facades. Their energy efficiency and indoor climateis, however, being questioned. Therefore more and more of these buildings are being built with doubleskin facades, which can provide: a thermal buffer zone, energy savings, wind protection with openwindows, fire protection, aesthetics, solar preheating of ventilation air, sound protection, pollutantprotection with open windows, nocturnal cooling and a site for incorporation of PV cells. However notall double skin facades built during the last years perform well.A project BESTFACADE was therefore funded by the European Commission to actively promote theconcept of double skin facades. An important part of this work is the creation of best practiceguidelines for double skin facades, which are outlined in this paper.