Barn owl surveys are required where proposals could result in the disturbance of potential barn owl roosting or nesting sites, even if the site itself will not be directly affected by the work (e.g. noise or lighting disturbance). Even buildings and trees set amongst unsuitable barn owl foraging habitat can be used by barn owls, as the hunting range of the individual owl can exceed 5km.
Barn owl surveys are conducted by an experienced and licensed ecologist, who would inspect any potential nest or roost sites and the surrounding area for evidence of barn owl usage. Barn owl activity surveys may be required if substantial areas of suitable barn owl foraging habitat are to be lost.