Conservation and preservation of heritage buildings require the knowledge and sharing of a great deal of data and information about buildings. Such information comes from the different disciplines involved in the restoration and maintenance processes. The integration and use of all this information in a single working environment is a key factor for the success of historical building conservation and management projects. Heritage (or Historic) Building Information Modelling (HBIM) is nowadays the most appropriate tool to collect and manage all data related to Architectural Heritage. The HBIM process requires an in-depth knowledge of the historical building that can be achieved using a detailed 3D survey and adequate parametric modelling. For this reason, the Scan-to-BIM approach, which involves creating the BIM model from a laser scanner survey, is widely used. The work focuses on the application of the Scan-to-BIM process to a historical/archaeological building in Palermo (Italy), the Castle of Maredolce. The work aims to obtain an HBIM of the building but the paper deals also with the survey issues and the modelling challenges, focusing on the different modelling approach between parametric and not-parametric architectural elements. The most difficult challenge of the modelling step was to obtain parametric objects of the complex geometries of the historical building. The work has allowed achieving the HBIM of the Castle of Maredolce and has highlighted some issues and advantages of the Scan-to-BIM approach.