re-MODULEES aims at the creation of an EU-wide “umbrella” framework for EE in existing residential buildings based on the generation of standard modules for the retrofit market activation and up-take. Modularity is to be intended as multi-level: it regards the “breakdown” of the overall retrofit process into standardized segments; and multi-target: it regards their customization according to regional climatic, building, socio-economic and market conditions, in order to shape more effective tools and approaches through which to maximise cost-optimality, positive spillovers and impact.