The paper presents, on the example of selected buildings, aspects related to the diagnostics of technical condition carried out in connection with the planned reconstruction of historic buildings and anticipated change of their function or modernization. The standard scope of the procedure for evaluating the technical condition and determining the need to strengthen structural elements of the analyzed objects should include: analysis of the conceptual design, analysis of archival documentation, construction inventory, analysis of geological conditions and foundation, visual inspection of the object with damages inventory, static calculations for current and designed states, identification of causes of existing defects, defining methods for reinforcement of weak elements or their replacement.

Keywords: historical buildings; assessment; technical condition; refurbishment.