Abstract: Buildings located in mining terrain, in addition to typical utility and environmental loads, take on the impacts in the form of ground surface deformation and mining tremors, which can adversely affect their technical condition. In these terrains, activities are carried out to prevent possible adverse impacts of mining on buildings. One of such activities is planning at the project stage for preventive protections of building structures against mining impacts and their implementation during the construction stage. The paper presents the results of an analysis of the cost of preventive structural protections performed in a group of single-family masonry residential buildings. For each building, we determined the replacement value and calculated the average share of the cost of preventive protections in the construction costs. Based on the difference in the course of technical wear between protected and unprotected buildings, a period of less than 26 years was determined during which the expenditures spent on the buildings' preventive protections are compensated by their lower technical wear. Over the subsequent useful life, owners of protected buildings receive measurable benefits in the form of lower technical wear of the buildings, and thus higher replacement value, as well as lower costs of repairs or renovations. The proposed approach can be applied to other operations concerning buildings or other fields of engineering to assess economic efficiency.