Assessment of the technical condition of a historic building using photogrammetry and terrestrial laser scanning: the case of the Juliusz Osterwa Theatre in Lublin

This paper presents a methodology for assessing the technical condition of the façades of a historic building, using the Juliusz Osterwa Theatre in Lublin as a case study. The approach is based on the integration of terrestrial laser scanning (TLS) data and close-range photogrammetry. The comprehensive dataset enabled the generation of a dense, metrically reliable 3D model of the building envelope as well as façade orthophotos. These products were used to prepare a detailed graphical inventory of damage, including surface cracking, cracks and fractures, corrosion, plaster losses, biological growth, and damp areas. The resulting damage maps allowed the identification of zones of advanced degradation, the prioritisation of conservation interventions, and the indication of methodological limitations and directions for further development, confirming the high usefulness of the proposed approach in modern, integrated diagnostics of historic buildings in urban environments.