Buildings make a large contribution to the energy consumption of a country therefore a very large potential for energy savings exists in the residential and tertiary sectors. Given the low turn-over rate of buildings (lifetime of 50 to more than 100 years) it is clear that the largest impact for improving energy performance in the short and medium term is in the existing stock of buildings. Major renovations of existing buildings above a certain size should be regarded as an opportunity to take cost effective measures to enhance energy performance by meeting minimum energy performance standards tailored to the local climate. Over the past 20-25 years, in many cases standards have been reinforced two to four times, including some very recent revisions. The effort is not yet finished. Reducing the energy consumption in buildings built in 50's and 60's is, at first, a complex issue in reduction of energy consumption in a technical sense, as well functional, social, economical and environmental aspects. Therefore for refurbishment of the facades as the most appropriate technical solution is selected “Externally Insulated Façade System”- EIFS. In this paper the impact of this technical solution regarding refurbishment of the facades and improving the energy efficiency of the buildings will be discussed.