The process of digitising architectural and urban heritage requires a series of interconnected operations using the most advanced technologies for the study and digital enhancement of buildings and their contexts. The article analyses these operations, dividing the subject into different sections but maintaining a unified vision. This vision integrates the digital representation of cultural heritage, through 3D BIM/H-BIM surveying and modelling techniques, with the digital processing of information related to the property, with particular attention to the digital management of archival documents and the digital representation of physical and performance characteristics. Considering not only the reconstruction of the current state of the asset, but also that of past configurations now lost. The paper concludes by exploring the potential use of a single web platform to disseminate and make accessible the results of the entire digitisation process. The objective is to define a dynamic and multilevel vision of the digitisation process specific to the AEC sector, that not only considers the digital modelling of volumes, but deals with every aspect of it, like the energy evaluation, the data management or the final fruition of the digital data produced or digitalised.