Bauphysikalische, ökologische und ökonomische Bewertung von geförderten Sanierungskonzepten in Wien

Evaluation of retrofitting concepts and municipal sponsoring in Vienna

Major energy efficiency improvements can be achieved via building stock retrofit. While in some major cities in Europe, mostly large-area building retrofit measures have been targeted; in Vienna a gradual thermal improvement of the building stock has been practiced. Thereby, a number of different instruments and programs have been promoted by the regional government. In the present contribution, a number of such programs are compared and evaluated based on the demonstrative case of a concrete example. Thereby, multiple related issues were addressed: energy efficiency, retrofit expenses, burden for the building owners and tenants, and burden for the funding agency (Municipal of Vienna). The results suggest:
- the main beneficiary of retrofit programs are typically the tenants. The landlords benefit indirectly due to the appreciation of property value;
- there is a certain lack of willingness on the side of the occupants toward thermal building retrofit measures;
- achieving passive house standard in the course of retrofit measures cause significant additional costs;
- permissible (fundable) maximum total retrofit expenses has been set too low.