An evidence-based overview of bat welfare challenges in the UK, including roost disturbance, insect prey decline, building work impacts, and how to help.
Key Facts
The UK has 18 breeding bat species — all are legally protected under the Wildlife and Countryside Act 1981 and the Habitats Regulations 2017.
Bat populations have declined dramatically since the 1970s — all species have experienced 50%+ population reductions driven by insecticide use, habitat loss, light pollution, and roost destruction.
Building work that destroys bat roosts causes immediate welfare harms to bats inside — planning permission for buildings with known roost potential requires bat survey and mitigation planning.
Insectivorous bats have declined proportionally to flying insect declines — intensive farmland with high pesticide use produces near-zero bat foraging habitat.
Light pollution from artificial lights at night (ALAN) disrupts bat foraging — some species (horseshoe bats) avoid lit areas entirely, fragmenting foraging habitats.
Grounding of bats during daylight hours is a welfare signal — healthy bats should not be found on the ground; grounded bats require specialist rehabilitator care (Bat Conservation Trust helpline: 0345 1300 228).
Cat predation causes significant bat mortality — a single cat in a garden with an accessible bat roost can cause colony-level population impacts.
Welfare Considerations
Bat welfare and conservation are inseparable — all UK bats are endangered relative to their historical populations. Report grounded bats to the Bat Conservation Trust helpline immediately. Commission a bat survey before any building work on old properties. Reduce garden lighting, support insect-friendly planting, and keep cats in at dusk when bats emerge.
What You Can Do
Call the Bat Conservation Trust helpline (0345 1300 228) for any grounded or injured bat — never handle with bare hands
Commission a licensed bat survey before undertaking any renovation or roof work on old buildings
Reduce garden and building light pollution — use motion-sensor lighting and avoid permanent illumination of bat flight lines
Plant insect-friendly native wildflowers and eliminate pesticide use to restore bat foraging habitat