Renovation Tracks For Europe up to 2050: The study suggests path to decarbonise buildings
This study, commissioned by Eurima, the European trade association for insulation manufacturers, presents three options in order to achieve these targets. One from which being the so-called 'deep renovation' because it is essentially based on improving the building envelope. The option could achieve the best results in terms of C02 emission reduction, energy savings and job creation. The other scenarios present more limited efficiency improvements with either a similar or higher renovation rate and high or low renewables use.
Ecofys study here.