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Bat Exclusion Project (London)

A resident in London had been living with Bats above their flat for a significant period of time and were becoming increasingly weary of the Bats’ presence, due to a Bat phobia (‘chiroptophobia’) and the noise that they were creating! Due to potential public health and safety concerns, Crestwood progressed investigations to establish whether a bat roost exclusion scheme could be agreed, in lieu of applying for a European Protected Species licence, which would have required delaying any exclusion works until after September – clearly not ideal for the homeowners.
 
As a result of Crestwood’s input, a licence was granted by Natural England on public health and safety grounds and work was undertaken to determine the size of the roost and the mitigation measures required (supplied by the Building Managers). Three surveys were undertaken on the building and, amazingly, a total of around 500 Bats were recorded emerging from the roost on one night alone. To re-house the bats, an artificial maternity roost was designed for placement on the flat roof of the flats, to provide an alternative home for this maternity colony, prior to the exclusion measures being set up.
 
Once the maternity boxes were in place, the exclusion took place over a week, using slippery one way plastic so the Bats could exit but not return. A final check of any spaces, as well as cleaning out old Bat droppings, took place within the roof of the building before sealing up the gaps with plastic soffit boards.
 
No Bats have since been recorded within the building and, as Bats typically find man-made roosting spaces a couple of years after installation, we will be monitoring the situation closely to gauge its success.
 
If you would like advice on bats or other ecology-related issues, then please do not hesitate to contact our ecology team (ecology@crestwoodenvironmental.co.uk).