* KfW 40: Energy efficiency standard for residential buildings (KfW Efficiency House 40), used by KfW, Germany's state-owned development bank, in its financing programmes. A building of this standard has a primary energy demand of no more than 40% of that of a reference building that meets the German Buildings Energy Act (GEG).
* QNG Plus: One of the two requirement levels of the QNG (German Quality Seal for Sustainable Buildings): Plus stands for above-average quality of a building's sustainability features, the higher level Premium for significantly above-average quality.