The energy performance of buildings which undergo major renovation or of the renovated parts of these buildings must meet the minimum energy performance requirements also applicable to the buildings' technical systems and components which have a significant impact on the building's energy performance.
Oluliselt rekonstrueeritavate hoonete või rekonstrueeritud hooneosade energiatõhusus peab vastama miinimumnõuetele, samuti peavad neile vastama hoonete tehnosüsteemid ja ehitusdetailid, millel on oluline mõju hoone energiatõhususele.