Digital surveying, combined with direct analysis, allows the precise knowledge of the geometry and materials of an architectural artefact. The identification of materials, construction techniques, conservation state, deformation and cracking patterns contributes to recognising the structural layout of the building and comprehending its mechanical behaviour. Determining the mechanical properties of the materials, the boundary conditions and the constraints between the different parts of the structure is essential for the development of a model that accurately represents the structural performance of the building. This issue is particularly significant for buildings that have undergone centuries of modifications, repairs, and partial reconstructions. Masonry ancient bell towers represent a particularly interesting combined application field of digital survey techniques and Finite Element Modelling (FEM). Over the years, research has advanced in 3D digitisation for the purposes of documentation, monitoring, conservation, and enhancement of architectural heritage. The choice of survey methods and instrumentation for inside spaces is constrained by limited spaces, complex geometries, poor lighting, and the presence of features such as bell mechanisms. Conversely, the survey of outside spaces is affected by the significant height of the structures and their proximity to adjacent buildings. This study highlights the potential of numerical models derived from laser scanner-based digital surveys for structural analysis. Surveys were carried out on six towers of five churches in the province of Catania. The resulting point clouds were used to develop solid Finite Element 3D models using the Midas FEANX software.