OptEEmAL ia a project funded under the European Union’s Horizon 2020 research and innovation programme aimed at developing an Optimised Energy Efficient Design Platform able to design energy efficient retrofitting projects that are based on different energy conservation measures to improve the behaviour of a district. The objective is to reduce time delivery and uncertainties and result in improved solutions when compared to business-as-usual practices. Under the coordination of CARTIF Technology Centre, 13 partners from 8 countries are working on delivering an optimised, integrated and systemic design tool based on an Integrated Project Delivery approach for building and district retrofitting projects.