A Bat Survey is ordinarily triggered when there is to be:

• Conversion, modification, demolition or removal of buildings (including hotels, schools, hospitals, churches, commercial and derelict buildings) which are:
• Agricultural buildings (e.g. farmhouses, barns and outbuildings) of traditional brick or stone construction and/or with exposed wooden beams
• Buildings with weather boarding and/or hanging tiles that are within 200m of woodland and/or water Pre-1960 detached buildings and structures within 200m of woodland and/or water
• Pre 1914 buildings within 400m of woodland and/or water
• Pre 1914 buildings with gable ends or slate roofs, regardless of location located within, or immediately adjacent to woodland and/or immediately adjacent to water
• Dutch barns or livestock buildings with a single skin roof and board-and-gap or Yorkshire boarding if, following a preliminary roost assessment, the site appears to be particularly suited to bats.
• At the behest of the LPA / County Ecologist.

Ordinarily, the form of initial survey required is a ‘scoping survey’ designed to investigate the presence of bats and / or the potential presence of bats. This is often in association with a survey for nesting birds.

The outcome of the scoping survey dictates the next course of action: 

• No / Negligible Potential – Usually indicates the end of the matter, (although, the LPA ecologist could still insist on further survey work).
• Low Potential – A minimum of one emergence survey
• Moderate Potential – A minimum of two emergence surveys
• High Potential / Confirmed Roost – Usually three emergence surveys are required.

Emergence Surveys

Emergence surveys are intended to prove that the building is or is not a bat roost. If bats are recorded, the survey records the access / exit point used by the bats, the numbers and species present. A decision is then taken on how to proceed. This could mean a Mitigation – Method Statement or an Natural England European Protected species Licence (EPSL). The exact requirements are dealt with on a case by case basis.

It is important to note that the majority of Ecological Consultancies are unable to obtain Mitigation Licences from Natural England – We are able to offer this service for Bats, Dormice and Great Crested Newts.

We will rarely consider writing an EPSL application based on the survey work of another ecologist. Please consider the implications of appointing an ecologist who cannot provide the full service.

Activity Surveys

Activity surveys are often required where development is to take place in a previousy undeveloped area such as agricultural fields or brown field site which has reverted back to a more natural state.

Each site is individually rated as either:

Low Habitat Value

 – One Visit Per Season (April – May / June – August / September – October) +

                    Five nights automated recording per season

Moderate Habitat Value

 – One Visit Per Month (April – October) +

                   Five nights automated recording per month

High Habitat Value

​ – Two Visits Per Month (April – October) +

                  Two automated recorders (ten nights) per month

The objective of the survey is to ascertain what if any bat species frequent the area and thus devise an appropriate mitigation scheme to ensure that bats using the site, are not impacted by the proposals.

Survey effort is normally conducted in accordance with Bat Conservation Trust (BCT) guidelines or upon the guidance of the LPA Ecologist.

Bat Roost Potential in Trees

As both ecologists and arborists we are able to undertake surveys of trees to ascertain the presence or otherwise of bat roosts.

There are a number of approaches, which we would be happy to discuss.

Any queries or concerns?

Please call us on 0800 888 6846 / 07474 681276