This type of survey is commonly requested by the council for small scale renovation and extension projects on residential properties, or as part of a larger Preliminary Ecological Appraisal. The assessment can be undertaken year-round and assesses structure(s) for suitability to support roosting bats and may recommend further bat surveys to determine presence or likely absence of protected species.
If bats are found to be present, a mitigation and compensation scheme will be produced considering the impacts of the proposals and may result in the need for a Mitigation Licence applied for and granted by Natural England to allow the works to proceed.
Yes, but there are two stages to this. A Preliminary Roost Assessment as part of a PEA (Preliminary Ecological Appraisal) or a standalone document which assesses the suitability of a building or tree to support roosting bats. The preliminary survey can be undertaken year round by a suitably qualified ecologist and will be graded as having negligible, low, moderate, high suitability to support bats or as a confirmed roost if evidence of bats is found.
The grading of the building dictates the likelihood of bat presence, however if bats are found to be present the survey effort should be sufficient to able characterisation of the roost type ( Breeding, hibernation, summer day roost etc) to determine the impacts to bats.
Bat surveys are constrained by season, and certain roost types need to be surveyed at certain times of year, so if required these need to be undertaken as soon as possible to prevent delays as bats cannot be surveyed over the winter period.
Our Protected Species Calendar provides a clear, at-a-glance guide to the optimal survey periods for key protected species throughout the year. It helps identify when ecological surveys can be carried out for each species, ensuring work is planned efficiently and in line with seasonal constraints.
By highlighting key activity windows, the calendar supports better project planning, reduces delays, and ensures surveys are undertaken at the most appropriate times to meet ecological and legal requirements.
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