The object of the planned project is to carry out a thermomodernisation project in multi-family residential buildings in the Baranów Sandomierski commune. The project includes the modernisation of three buildings located in the commune, which serve as a residential function. These include: 1. Residential building at ul. Castle 23, 2. Residential building at ul. Castle 25, 3. Residential building at ul. Locker 27. The scope of works includes thermal modernisation of buildings, consisting of replacement of window and door carpentry, insulation of external bulkheads that do not meet the parameters of thermal penetration. The proposed scope of work will improve the thermal parameters of the facility and increase the efficiency class of buildings, which will increase the thermal comfort of users and reduce emissions of pollutants into the atmosphere.