The implementation of the ‘Požega-Slavonia Energy renovation project’ at the Josipa Runupina 1, 34000 Požega will result in a reduction of annual primary energy consumption in the building by 323 518.75 kWh/year and by 41.35 % and by reducing the annual heating energy needed for heating by 189 160.64 kWh/year and by 50.82 %. The result will also be a 43.06 % reduction in CO2 discharges. The effects of the energy renovation of the building are reflected in the increase in the standard of use of the building and the creation of better living conditions for people to stay in comparison with the existing ones, not the adequate status of the building.