Lesser horseshoe bats mainly roost in buildings during the summer months (May - Sept) prefering 16th century buildings, often with stone walls, slate roofs and uninterupted flight access (Schofield 2008). During this time some bats will occasionally use alternative day roosts (satellite roosts), but the colony as a whole will remain in the same roost (Knight 2006). Research suggests that this occasional roost switching may be related to the energetics of breeding (Seckerdieck et al. 2005).
Bats also use night roosts away from the maternity roost inbetween foraging bouts. These are often in buildings and located within 1-2km of the maternity roost (Knight 2006). It is believed that night roosts are used to minimise energetic losses during periods of reduced prey availiability (Anthony 1981) or in periods of high energetic demand when females are heavily pregnant. It is also suggested that night roosts are used to facilitate information transfer between individuals (Kunz 1982; Wilkinson 1992).