Vienna is the capital of Austria situated close to Hungary. The EU-GUGLE district is named Penzing or the 14th district. The smart Viennese gate to western Austria and to the Natura 2000 area, the Biosphärenpark Wienerwald, covers about 3,374 hectares with a share of 60% on open space including parts of the forest surrounding Vienna. All envisaged demonstration buildings have poor energy performance values and urgently need the foreseen renovation. The main focuses are the efficient refurbishments of around 62,546m² gross floor area with prefabricated façade elements, the intelligent integration of renewable energy in buildings and realisation of suitable accompanying measures to create a high-quality city district.


The Pentzing district

The district has about 84,362 inhabitants. Citizens in the age between 40 and 50 years are dominant. All envisaged private buildings serve as viable space for tackling the different flat ownerships that exist in Vienna. Special appointments with “house representatives” will be organized to countercheck baseline data of the social housing company Wiener Wohnen and other partners, as well as to map building particularities during the preparation phase of the realisation.

The building stock:

  • 62,546m² gross floor area surface is to be renovated.
  • 3592 inhabitants live in the renovated buildings.
  • 1038 dwellings are to be renovated.

The buildings within the district are residential buildings and social housing, they are owned by tenants and flat owners.

The Pentzing district

Technical and non technical measures:

The demonstrations will use several innovative integration measures and enabling technologies such as:

  • Decentralised ventilation
  • Smart metering
  • Integration of CH4 produced by renewables
  • Building Integrated PV (BIPV)
  • Solar thermal
  • Replacement of decentralised fossil heating systems by centralised renewable heating plants
  • Symbiotic integration of green power marketing
  • Socio-economic evaluation
  • Participatory action research
Map Vienna


The expected energy efficiency savings are about 55-65%. During the project, data of planning and implementation details will be collected to provide information about building physics, refurbishments and HVAC of the realized demonstration objects. Monitoring data will also be collected, in order to compare measured results with calculated yields. In order to figure out interactions of energy-related consumer behaviour and to point out lessons towards how to apply consumer-oriented strategies more effectively, interviews will be performed with selected end-users.

Financing model

The smart district project relies on developing a interdisciplinary city quarter business model as trendsetting multiplier with the property manager, building-users and industrial partners. The total costs for energy saving measures of the private buildings foreseen for retrofitting are calculated and divided in structural (maintenance) as well as energy efficiency measures. Under the hypothesis of 30 years lifetime, consideration of no inflation and no escalation rate of energy prices the proposed measures have a simple pay-back time of about 15 years, corresponding to a rate of return in order of 5.5%.

Main challenges

Within the regional regulation of Vienna there are many regulatory issues related to tenants and to flat and house owners to be considered. Related actions are set-up in order to at least address or in best case to overcome them. Based on previous experiences of other demonstration projects, easy and understandable information will be prepared for tenants and other building users, which consider financial and social aspects on the building renovations. Special appointments with “house representatives” will be organized.