In the federal province of Salzburg, the EPC is necessary in order to receive an energy-related subsidy, and the process follows a two-step procedure: to receive a construction permission, the planning EPC has to be issued and accepted by the officials; additional changes during the implementation planning have to be considered in the updated (or completion) EPC, which proves whether the final planning and completion of the building still meets the requirements in terms of energy performance in order to receive the subsidy. This two-step model can serve as role model procedure for other federal provinces in Austria.
This study investigates the Salzburg model concerning strengths, weaknesses, and lessons learnt. It is built around the following objectives:
- Comparison between planning and completion EPC of 26 multi-unit residential buildings in terms of quality and compliance of input data according to OIB Guideline 6 and adaptations on federal province level, evaluation and analysis of deviations.
- Recalculation of the completion EPCs of 26 multi-unit residential buildings by independent personnel according to OIB Guideline 6 and information specifically collected for this purpose such as implementation plans; evaluation and analysis of deviations.
- Detailed technical investigation of compliant input data concerning the impact of compliant default input values stated in OIB Guideline 6 compared to compliant specific input values according to detailed calculation procedures following OIB Guideline 6 including references to Austrian and ISO standards.
- On-site investigation of 11 selected buildings out of the 26 multi-unit residential buildings.