Bat species who live in buildings are for example Eptesicus serotinus and Pipistrellus pipistrellus. But many other bat species can live in buildings. They use for example gaps and cracks as quarters and attics are gladly accepted, too. Also Myotis myotis belong to the bat species living in buildings: they populated large attics of churches, monasteries and palaces.
The bat populations, however, are greatly diminished in the last 40 years. Causes of their extreme decline are mainly lack of food due to the use of pesticides in agriculture; poisoning by wood preservatives used in buildings and the destruction of quarters due to roof works, renovations and thermal insulations.