The famous building complex of the Međimurje Police Department is a functional unit of buildings that are energy inefficient and do not have any positive effects on the environment. Rational use of energy products and the absence or deterioration of building elements that have a direct impact on energy efficiency has been accessed by the Energy reclamation project of the whole. The required documentation is produced and the design measures are designed to increase energy efficiency, decrease the energy consumption for heating (Qh, nd) on an annual basis by 61.26 %. The project foresees actions involving building, engineering and electrical engineering, the implementation of which will achieve the designed energy savings targets.