Bat Roost Protection During Building Works

Bat roosts in buildings receive full legal protection but are frequently damaged or destroyed during renovation and development, causing welfare harm to roosting bats including maternity colonies.

Key Facts

UK bat roosts including all bats, their eggs, young and roosts are protected under Wildlife and Countryside Act 1981
Damage or destruction of bat roosts carries fines up to 5,000 pounds per bat under current legislation
Maternity colonies disturbed during June-August when young bats cannot fly result in flightless young dying from exposure
Common pipistrelle maternity colonies in buildings can number 100-300 individuals occupying roof voids and wall cavities
Bat survey requirements must be met before planning permission for development affecting potential bat habitat is granted

Welfare Considerations

Bat roost protection during building works is simultaneously a legal obligation and a welfare imperative. Maternity colony disturbance during the breeding season causes deaths of flightless young that cannot escape when their roost is opened or disturbed. Adult bats fleeing disturbed roosts may die from exposure or fail to locate young. These welfare harms are entirely preventable by following legal requirements — commissioning bat surveys before work begins, timing works to avoid the maternity season, and implementing bat-friendly renovation techniques when roosts are present. The legal framework is clear; the welfare case is clear. The challenge is ensuring compliance is routine rather than exceptional.

What You Can Do

Commission a bat survey before any renovation or building work potentially affecting bat habitat
Time external works to avoid June-August when maternity colonies contain non-flying young
Report suspected bat roost disturbance to Natural England and Bat Conservation Trust
Contact Bat Conservation Trust roost advice line (0345 1300 228) if you find bats during building work