Current renovation practices cannot reach the energy reduction goal that the European Union has set by 2050. The traditional renovation methods are very time-consuming and cannot ensure the final energy improvement. The aim of this thesis focuses on the design of a prefabricated modular façade system that can be adaptable to different building typologies and climates. The main focus is to create a system that will reduce the current energy demands of existing buildings while at the same time giving the opportunity for a faster renovation approach.