“…Writing a project proposal that is as complete as possible, interdisciplinary and easy to improve represents the other major challenge for interventions on existing buildings in order to make the whole restoration/rehabilitation process more efficient. The benefits that can be obtained are in fact better cooperation between the different design agents, cost reduction, error reduction and time shortening (Bastem & Cekmis 2021). Furthermore, the HBIM, even if it does not have visualisation as its main purpose, has a double function in terms of public projects on heritage buildings: to facilitate the participation of citizens in the design process by creating graphic representations that, almost in real time, allow to obtain an opinion also from the side of a very disparate public of stakeholders, favouring in particular the access to information on the future of the project to ordinary citizens, often excluded or not used to imagine the final effect from a simple view of 2D drawings; to provide the opportunity to virtually access the building to raise public awareness of the importance of protecting cultural heritage.…”