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Facts & Figures
Green Building Cluster of Lower Austria (October 2011)
Number of cluster members: 198
Total number of member employees: 10,990
Total combined turnover of members: EUR 3.7 m
Key facts
Refurbishment of Old Buildings to Low-Energy Standards
Statistics - and a quick look to the surrounding landscape – confirm that residential building in Lower Austria is dominated by single-family homes. Around 94% of buildings are either detached or semi-detached homes.
Many residential buildings built during the period from 1945 to 1980 are now in great need of refurbishment. Only in the 1980s did improved thermal protection standards begin to gain gradual acceptance. Homes built prior to the war and also those built in the 80s and 90s also show potential for improvement.
Older Building Stock and Market Potential in Lower Austria
| Building stock consisting of detached and semi-detached homes in Lower Austria built from 1945-1980 (data from 2001) |
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| Type of house | No. of residential units | Gross floor area (GFL), in m² | Refurbishment 3% res. units | Refurbishment 3% GFL, in m² | Refurbishment costs at € 600/m² GFL |
| One-/two-family home | 174.162 | 22.422.585 | 5.225 | 672.678 | 603.606.530 |
| Multiple-family home | 73.877 | 5.748.624 | 2.216 | 172.459 | 103.475.232 |
| Total | 7.441 | 845.136 | 507.081.7 | ||
A Study by Umwelt Management Austria" (June 2008); Lower Austria Economic Chamber; province of Lower Austria
At present, the annual refurbishment rate is approximately 2%; by 2012, it is expected to have increased to around 3%. This will act as a catalyst for technology, job creation and added value for Lower Austrian companies.
A refurbishment rate of around 3% would (assuming refurbishment costs of approximately EURO 600/m2 GFL as a rough yet likely widely applicable estimate) result in investments of around EURO 507m for single- and multiple-family dwellings built from 1945 to 1980.
Passive Houses, Optimal Heating & Ventilation in New Homes
According to a recent study carried out by the Danube University Krems, 2010 saw the construction of 219 new passive houses, meaning a 12% share of all new single-, two- and multiple-family dwellings within the market of subsidized new building in Lower Austria. In 2009, passive homes were only 5% of this market.
The development for Austria as a whole (see chart below for a prognosis up to 2015) shows an average share of 24% for passive homes for all of Austria. This may be explained by the large number of apartments being built to passive house standards in Vienna, where an entire section of the city has in fact been built to passive home standards. In cities with a large number of multi-story dwellings, like Vienna, the number of residential units is naturally higher than in Lower Austria, where single- and two-family homes make up more than 90% of total residential structures.
Low-energy homes are standard in subsidized new residential building in Lower Austria; in fact, no subsidies are available for residential buildings which have annual heating requirements of over 50 kWh/m².
orange: Residential units in passive house standard
gray: Residential units built per year in AUT
