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Energy certificates for new buildings have already come into force, and for existing buildings will come into force on 01/01/2009 according to the Länder regulations. The certificate has to be provided with the draft contract; in addition, if an agreement is concluded, the certificate has to be given to the buyer or tenant. In general, certificates will be issued for the whole building, but the new law also allows for certificates for apartments or parts of a building with specific use (e.g. salesrooms, business offices).

Calculation procedures

The heating and cooling demand is calculated in accordance with the guidelines published by the Austrian Institute of Construction Engineering. A sophisticated calculation system has been developed, including authentic descriptions of buildings, based on more than 200 mathematic algorithms providing differentiated descriptions covering most of the details used in conventional and special purpose buildings. The user of this system has the opportunity to use all available details, but is not obliged to do so, and can do the calculation instead using the default values.

Assignment to the “residential building” category is based on the building’s primary use, provided other uses does not exceed a conditioned net area of more than 50 m2 or a 10% share of the conditioned gross area. If this proportion is exceeded, the building must be divided up, into individual parts that must be assigned to the “residential building” or “non- residential building” categories. This requirement is reviewed separately in connection with the individual parts of the building.

As regards non-residential buildings, a distinction must be drawn between the following 11 categories of building (plus special buildings):



office buildings

› nurseries and compulsory schools › secondary schools and colleges



hospitals

› care homes › guest houses



hotels

› bars and restaurants › meeting places

› ›

sports facilities sales outlets

› other air conditioned structures

In order to make the calculation system as authentic as possible, several additional features have been developed as a climate model by collating monthly climate data especially for heat storage in relevant parts of the buildings and other purposes and a methodology to calculate the economic and environmental status and effects of the use of renewable energies for new and existing buildings. In Austria renewable energies have already a share of 25 percent of the overall energy consumption and this is expected to increase. As CEN-standards have reached the stage where the methodologies should only be subject to minimum change, they have been implemented, and will guarantee a high compatibility of the Austrian calculation methodology to a future harmonised European methodology to the largest possible extend.

A simplified methodology for existing buildings has also been developed using the experience of the various Austrian energy consultants and the energy consulting offices of the Länder, especially in Vienna which is the owner of more than 200.000 buildings and apartments, in order to be able to finalize the building certificates by 2009.

EPBD Buildings Platform > P124_Austria_June 2008

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