Refurbishing Hattingen’s Südstadt: Renovating the living space and energy supply

The Hattingen apartment construction cooperative (hwg) has been renovating the 1950s ’SüdstadtGarten‘ housing estate since 2007. To maintain the attractiveness of the district over the long term, the around 1,000 apartments are being expanded and restructured as well as upgraded to be climate-friendly and energy-efficient. The whole initiative is regarded as a pilot project.

With a 35 per cent share in total national energy consumption, the construction sector is responsible for a large proportion of all CO2 emissions in Germany. Due to the insufficient building insulation and the dated heating system, the ‘SüdstadtGarten’ apartments also consumed a great deal of energy prior to their modernisation. Therefore, hwg decided to pay special attention to improving the residential units, particularly in terms of their energy consumption, during the refurbishment process.

Engine for progress:

  • A co-operative’s pilot project for the refurbishment of districts
  • Evaluation of various refurbishment concepts (insulation, window types, ventilation)
  • Practical test of various energy supply concepts
  • Incorporation of one construction phase into EnergieAgentur.NRW's ’100 climate protection estates‘ programme

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Foto: hwg eG

Hattingen's ‘Südstadtgarten’ urban district has a new shine following the refurbishment work. hwg eG is investing around 90 million euro in renovating the existing buildings and constructing new buildings. The houses are configured in such a way that they use as little energy as possible.

Twelve years of modernisation and reconstruction to produce a modern district

During a total of eleven construction stages to be completed by the start of 2019, the floor plans of the apartments are being changed and their configuration adapted to today’s usual standards while the building insulation and the window systems are also being renovated and new ventilation and energy systems installed. Natural gas-condensing boilers, heat pumps using geothermal energy, wood pellet heating and solar thermal and photovoltaic systems ensure a more efficient energy and heat supply. What is special about it is the fact that various refurbishment and energy concepts are being used in the individual houses of the residential estate. hwg evaluates the operation and performance of the systems as well as the consumption of the individual residential units in order to determine the optimal solution for future modernisation projects. As a result, thanks to reduced energy consumption and the use of efficient decentralised and partly renewable energy-based conversion systems, all measures implemented to date are already leading to a significant reduction in CO2 emissions of approx. 50 per cent.

Energy supply in line with a climate-friendly future

In the modernisation of its existing properties, hwg set itself the goal to also achieve the energy standards specified for new builds – an aspiration which it has meanwhile even exceeded in some cases. For instance, an apartment building for families that was originally planned as a passive house has been transformed into a zero-emissions house in the course of its refurbishment through the use of renewable energies to cover the remaining heat requirement, and is thus considered an environmental showpiece.

The already completed fifth construction phase of ‘SüdstadtGarten’, which comprises the modernisation of several apartment buildings for families, has been incorporated into EnergieAgentur.NRW's ’100 climate protection estates‘ funding programme. This NRW project is aimed at reducing the CO2 emissions of housing estates in NRW. The condition for incorporation is that the thermal heat requirement of the buildings be no higher than 20 kilowatt-hours per square metre and year – as is the case in the houses of this construction phase of ‘SüdstadtGarten’.

Photo: hwg eG

The sustainable use of resources and the efficient use of renewable energies correspond to how we see ourselves.”

Marcus Kibilka, Südstadt project management

“As a project manager, my goal is to build sustainably and thus take responsibility for our environment and the environment of future generations.”

Thomas Babiennek, Südstadt project management