Where built structures are assessed to have suitability for hibernation roosts, targeted hibernation surveys may be necessary. Hibernation surveys comprise a minimum of two visits, spread at least four weeks apart. 

An inspection of the built structures and any potential roosting features will be undertaken, which may include the use of ladders, an endoscope and torch as survey aids. 

During each survey, automated static bat detectors will be deployed for a minimum of two weeks to monitor any bat activity. Acoustic analysis of the bat sonograms recorded by the static bat detectors will be completed using acoustic analysis software to determine the species of bats present.