Noctule Bat Welfare: Roost Site Protection in the UK 2026

The noctule is the UK's largest bat and an aerial specialist, facing welfare threats from roost site loss in mature trees and tall buildings.

Key Facts

Noctules are among the fastest and highest-flying UK bats, hunting beetles and moths above the canopy
They roost exclusively in tree holes, particularly in mature oaks, beeches, and other large trees
Female noctules form maternity colonies of 20-100 individuals in large tree holes during summer
Tree felling for development and safety management destroys roosts without adequate survey
Noctule bat populations have declined significantly across Europe since the 1970s

Welfare Considerations

Noctule bat welfare is primarily threatened by the loss of mature trees with suitable roost cavities. Development, tree surgery, and the removal of trees deemed hazardous destroys roosts - sometimes with bats present - causing direct mortality and population disruption. Female bats return to the same maternity roosts year after year, and destruction of these sites during the breeding season causes the death of dependent pups. Legal protection under the Wildlife and Countryside Act and European legislation requires bat surveys before felling, but survey standards and enforcement are inconsistent.

What You Can Do

Retain mature trees with cavities on your property or land where possible
Ensure any tree work requiring planning permission includes a bat survey
Report suspected roost disturbance or destruction to the Bat Conservation Trust
Install bat boxes of appropriate size to compensate for lost roost sites in managed woodlands