Bats roosting in buildings and trees face welfare threats from roost disturbance during building works and renovation, with legal protections requiring survey and mitigation.
Bats disturbed from maternity roosts during the summer months suffer immediate welfare harm through thermal stress, energetic disruption, and in the worst cases separation of pups from mothers. Pups that fall from the roost or are separated cannot thermoregulate independently and die rapidly from hypothermia. Even disturbance short of physical destruction displaces pregnant and nursing females at a time when energy demands are highest. Legal protection reflects recognition of this welfare and conservation risk, but enforcement depends on survey requirements being met and mitigation measures being properly implemented.