Bat Surveys, Licensing & Mitigation

We provide Preliminary Bat Roost Assessments (PBRAs) to determine if your building/structure or tree has bat roost potential. This is an important first stage in deciding whether further bat surveys are necessary.

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If a building/structure or tree is assessed as having bat roost potential, further surveys are typically recommended; the number of surveys dependent upon the level of bat roost potential (Negligible, Low, Moderate, High).

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All of our surveys are undertaken under the Bat Conservation Trust's Guidelines 2016 by licensed surveyors.

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Timing: All year round.​

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Emergence (dusk) and Re-entry (dawn) surveys are undertaken at buildings/structures and trees assessed as having Low, Moderate or High bat roost potential. These surveys are designed to confirm if a roost is present, and if so, the type of roost, species using the roost and numbers of bats involved.

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Bat activity surveys are undertaken when it is necessary to understand how different habitats support roosting, foraging and commuting bats. Activity surveys comprise a combination of transect surveys (Ecologists walking predetermined transect routes) and automated / static bat detector surveys using bat detectors deployed at fixed locations to record bat activity remotely.

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All of our surveys are undertaken under the Bat Conservation Trust's Guidelines 2016 by licensed surveyors.

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Timing: Emergence/Re-entry: May to August, running into September if surveys have already begun (May-August).  Activity: Seasons throughout the year from April to October.

If a roost is confirmed, it may be necessary to proceed with works under the auspices of a European Protected Species Mitigation Licence (EPSML) from Natural England. Complete survey data is necessary for a successful licence application, together with a mitigation strategy.

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