zum Inhalt springen
  • dachflaeche

    Life on and under the roof

Life on and under the roof

Would you like to fill your roof with life? That’s a great idea, as roofs play an important role in promoting nature in cities. Green roofs are the big vision for the cities of tomorrow: cool, calm, and full of life. Much of it has already been a reality in Vienna for decades. But in order to extensively adapt to a changing climate, we must all do our part. So-called extensive, low-maintenance roof greening can especially create large flowered areas and butterfly habitats.

Not only on the roof, but also under it - if made accessible - animals can find refuge: Bat habitations are often found under accessible roofs. If you keep the entrance hole open, you will have lots of little house mates.

Target species


Common blue butterfly

Common carder bee

Goldmoss stonecrop

Grape hyacinth

Gray long-eared bat

Good to know

  • There is a distinction between extensive greening (no watering, rocky grassland or steppe-like grass and herb corridors with a substrate layer of up to 15 centimetres) and intensive greening (watering, at least 20 centimetres of soil structure plus drainage layer, vegetable patches and trees possible).
  • Not all types of roofs are equally suited for both types of greening (extensive and intensive) due to their static requirements.
  • Extensive roof greenings are especially rich in species and for smaller set-ups on the roofs of garden sheds or carports, they can be easily built via simple means.
  • Bats do not cause damage in attics. Their faeces (guano) can be easily removed and used as valuable free fertilizer.
  • Roofs without greening get extremely hot in summer and foster the occurrence of heat islands.

What does the City of Vienna do?

The City of Vienna - Environmental Protection department subsidises roof greening up to a maximum of 20,000 euros. You can apply for funding here:
Stadt Wien: Dachbegrünung Förderungsantrag(wien.gv.at)


Are you planning a roof extension? Contact us while you are still in your planning phase! Together, we can find solutions for your flying house mates:
Homepage der Stadt Wien – Umweltschutz (umweltschutz.wien.gv.at)

DIY extensive roof greening and creating flowered areas

Coarse formwork on your garden shed or carport with edge beams on the sides, sealed with sheeting, and connected to the drainage system by a tinsmith, and you're good to go. Practical instruction can be found on the following pages:

The following collection of Internet links was selected as an example and does not claim to be complete.

Dachbegrünung selber machen


Commissioned roof greening and creating flowered areas

Once you have decided which type of roof greening is best suited for your building, you can find a company to support you in your endeavour. Depending on the type of greening you need, you will have more or less planning and maintenance to do. Vienna has many suppliers who provide natural roof greenings. Let us tap into the potential of the many roofs!

The following collection of Internet links was selected as an example and does not claim to be complete.


All-round information

Creating/preserving bat-friendly attics and promoting habitations:

A whole different story, but equally important for biodiversity: How can I make sure bats move into attics and maintain them as suitable habitats for bats? You can learn more here:

The following collection of Internet links was selected as an example and does not claim to be complete.


People used to try to get rid of bats that lived in their attics. Today, we enjoy having these quiet house mates. The more scientists learn about the fascinating lives of bats, the more we become aware of their important role in ecosystems. Find general information on bats here:

Stiftung Fledermausschutz: Heimliche Untermieterinnen (fledermausschutz.ch)

NABU: Wispern und Zetern auf dem Dachboden (nabu.de)