Under the conditions of the long-term and full-scale russian’s military aggression in Ukraine, the problem of preserving and fixing the architectural heritage became critically relevant, especially for surviving frontline cities like Sumy, Kharkiv, and others. The rapidly growing interest of the international community in historical heritage stimulates scientists to fix the architectural identity for settlements by implementing modern approaches and recording the historical architectural and urban environment. For this purpose, laser scanning and photogrammetry with subsequent 3D modeling are widely used to preserve EU countries’ architectural and historical heritage. The developed applied research focuses on the fixation and digital reconstruction of architectural objects using a wide range of up-to-date software. The proposed methodology includes recording preserved historical sites and architectural objects in the frontline cities of Ukraine. This involves collecting and analyzing archival, historical, and cartographic sources with detailed analysis. The research process applies the synchronization of geographical and historical maps and street planning schemes. Moreover, a study of the planning system of settlements and architectural objects was carried out to find the location of lost historical structures. Photogrammetric scanning and a point cloud are also applied for architectural heritage objects. A detailed analysis of the scanned objects was made. As a result, a digital model of an existing cultural heritage object for underground space protection was created for the center of Sumy city. This model allows for further study of a cultural heritage object and its adaptation to modern urban space needs to overcome military threats.