The construction of the buildings concerned was Pleso located at the Adolfa Frusfa, Velika Gorica. After the proposed energy efficiency measures there will be a saving in energy consumption, the total primary energy will be reduced by 245 240.00 kWh/a and by 67.14 %, the saving in heat consumption for heating will be 69.80 % and the reduction in CO2 emissions will be 38,51 T/yr, which will result in a 69.80 % reduction. Thus, the current energy class E after an energy renovation will change to energy class B.