Prof. Dr Jean-Louis Scartezzini1, Barbara Smith21Conference Chair, Editor-in-Chief, Ecole Polytechnique Fédérale de Lausanne (EPFL), Solar Energy and Building Physics Laboratory, Station 18, 1015 Lausanne, Switzerland 2Conference Manager, Co-editor, Ecole Polytechnique Fédérale de Lausanne (EPFL), Solar Energy and Building Physics Laboratory, Station 18, 1015 Lausanne, Switzerland jean-louis.scartezzini@epfl.ch Preface to the CISBAT 2019 Journal of Physics: Conference Series special issue CISBAT 2019 took place from 4 to 6 September 2019 at the Ecole Polytechnique Fédérale de Lausanne (EPFL) in Switzerland under the heading "Climate Resilient Buildings - Energy Efficiency & Renewables in the Digital Era". Focused on energy efficiency and the use of renewables in buildings and cities, CISBAT bi-annually offers a dynamic platform for scientific exchange in fields ranging from nanostructured materials for renewable energy applications in buildings to urban energy systems.