The preliminary definition of works for the new rehearsal room was developed using BIM methodology in order to allow the check of technical areas, such as tunnel services, local plants and local plants rehearsal room or loft exchangers. The level of development was an LOD200. This approach has allowed us to anticipate, at a time where the building site was still at aerthwork’s phase, the decision to enlarge the local plants, to optimise the size of the tunnel services and to locate in an outdoor area the main hangar all the electrical service to the rehearsal room.