The work deals with an overview and energy performance analysis of 178 buildings (energy performance certificate), which were issued in the years 2014 and 2015 from the contractor of energy performance certificates (license number holder) 009. Data covers calculated energy performance certificates in which there are mostly residential (159) and a few non-residential (19). In the analysis the majority of comparison is carried out between three major factors for energy performance of buildings - namely age, purpose and energy performance class of the buildings. Alongside that comparison, there is a further comparison between renovated and unrenovated buildings. As it was expected, newer buildings and older renovated buildings have better energy performance classes from year to year. This is because the legislation in the field of effective energy use in buildings in Slovenia gets stricter and stricter.
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