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Minimum requirements for major renovation

Minimum requirements are valid for all new buildings as well as for major renovation (when the value of renovation works exceeds 25% of the building value without the land). The requirements are valid for all sizes of buildings under major renovation (no 1000 m2 rule is used).

In case of a renovation that exceeds 40% of the envelope, the placement of insulation is necessary according to the Umax rule. In case of window replacement, prescribed window technology must be installed and, if the heating system is renovated, hydraulic balance as well as local and central regulation are both required.

Feasibility studies of AES in new buildings larger than 1000 m2

The implementation of the feasibility studies of AES, according to art. 5.2, is based on the Regulation on the methodology of feasibility studies for alternative energy systems in buildings (Official journal RS, Nr. 35/2008, 9 April, 2008).

For new buildings with useful floor areas exceeding 1000 m2, the feasibility studies according to art. 5.2 of the directive have to be done as a part of the documentation for the building permit. The regulation defines the methodology for the feasibility study and the necessary indicators for comparison of energy supply systems.

Certification of buildings

The amended Energy Act (Official Journal Nr. 118, 17 November, 2006) defines the framework conditions for energy performance certificates (EPC). Certificates for new buildings and public buildings are obligatory since January 1, 2008. Large public buildings have to obtain an EPC in the period from January 2008 until December 2010 at the latest, and then publicly display them.

The EPC can be issued either for a part of the building (flat or non- residential unit), or for a whole building. According to the law, the EPC has a status of public document. Therefore, it can only be issued by authorised companies and elaborated by licensed experts.

Classes for EPC (asset rating)

A – 0 to 15 kWh/m² B – 15 to 35 kWh/m² C - 35 to 60 kWh/m² D - 60 to 105 kWh/m² E - 105 to 150 kWh/m² F - 150 to 210 kWh/m² G - above 210 kWh/m²

The regulation on energy performance certification of buildings defines the methodology of energy certification for new and existing residential and non-residential buildings in case of sale, rent and public placement. It determines when asset or operational rating is to be applied. An asset rating certificate is considered for new buildings and existing residential buildings (based on SIST EN ISO 13790). Operational rating certificates are foreseen for all the other buildings.

For EPC’s based on an asset rating, energy efficiency classes are based on the energy demand for heating. There are 7 classes A-G. Classes A and B are further split into two sub-classes each. Final energy and CO2 indicators calculated from the primary energy demand are presented on the front page of the certificate, using a colour scale. All three indicators are given equal importance.

Operational rating certificates are issued for existing non-residential buildings (based on SIST EN 15603). The core indicators in operational rating certificates are the final energy for heating (kWh/m2a), the electricity consumption (kWh/m2a) and a CO2 indicator (kg/m2a).

EPBD Buildings Platform > P141_EN_Slovenia_Nov08

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