The optimisation and renovation of the Elzenhof Community Centre, located at 1050 Ixelles, consists of: — Creation of an entrance axis (access axis) in the entrance hall; — Renovation of the heating system to an energy-efficient and compliant installation; — Renovation of the attic: Renovation of the roof envelope of the attic; — Renovation of the rear building: renovation of the roof envelope of the rear building with significant insulation.