* 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: Qualitätssiegel Nachhaltiges Gebäude (German Quality Seal for Sustainable Buildings), a seal of the German Federal Ministry of Housing, Urban Development and Building (BMWSB). Awarding it requires certification with a registered assessment system for sustainable building and compliance with special requirements in the public interest.