ecological consultancy

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Bat Surveys, Mitigation & Licensing

jh ecology can provide advice on all aspects of bat surveys and has experience of working on a variety of projects requiring bat surveys throughout England, including the South-west, South-east and Midlands. We have provided guidance and expert advice on a range of projects from small scale barn conversions to bat surveys of large scale development schemes. Recently, we have undertaken bat surveys within Devon, Dorset, Somerset, Gloucestershire, Herefordshire, Worcestershire, Hampshire, Berkshire and London. We produce bat survey reports to accompany planning applications and design bat mitigation measures to satisfy planning authorities and prepare mitigation licence applications for submission to the statutory nature conservation organisations.

Common pipistrelle bat

Common pipistrelle bat

Bats can be found almost anywhere including rural and urban areas, and roost in a wide variety of sites that vary from natural sites such trees, to man-made structures including buildings, bridges, mines and tunnels. As natural roosting sites have become scarcer due to development and land use change, the importance of man-made structures for bats are becoming essential in the survival of many bat species. Each building, be it modern or traditional, and tree is a potential bat roost.

All species of bat (and their roosts) are European Protected Species under The Conservation of Habitats and Species Regulations 2017 and are also protected under the Wildlife and Countryside Act (WCA) 1981 (as amended). These pieces of legislation make it an offence to: disturb, kill or capture a bat or disturb, block access to or destroy / modify a bat roost.

Bat Surveys

Bats can be affected by a wide range of development works including: barn conversions; demolishing buildings; extensions that impact roof access; wind turbines; removal of trees or hedgerows; and building or maintenance of roads. Bat surveys are required for sites where there are buildings or other structures that bats tend to use, or underground structures like abandoned mines and tunnels nearby, or there are trees with potential roost features (PRFs), or if a wind turbine is proposed near to a site protected for its bat populations or close to potential bat habitat, such as woodland, hedgerows, rivers, lakes, caves, mines or structures that bats might use.

Bat survey of a barn

Bat survey of barn undertaken by jh ecology

We will typically conduct an initial assessment to identify evidence of and / or the potential for bats to be present on a site. This will be followed up by surveys for bat presence / absence, the level of bat activity and status of roosting sites, and an evaluation of the habitat potential for bats. When undertaking bat surveys we follow current best practice guidelines as issued by the Bat Conservation Trust (BCT) ‘Bat Surveys for Professional Ecologists: Good Practice Guidelines’ 3rd edition.

We are able to offer the following services:

  • Building assessments (preliminary roost assessments): internal and external building inspections for bats, including features with the potential to support bat roosts.
  • Presence / absence and roost characterisation surveys: dusk emergence and pre-dawn re-entry surveys to record bats emerging from or returning to roosts. Where appropriate we use night-vision infra-red video camera equipment as a complementary method to assist in identifying emerging bats.
  • Activity surveys: walked transect surveys and automated techniques using static bat recorders (such as Anabat Express detectors).
  • Ground level tree assessments for bats and climbed tree inspections.
  • Survey and assessment of sites for bat hibernacula.
  • Analysis of bat calls using a variety of software (i.e. BatSound and Analook).

Please refer to our Ecological Survey Calendar for seasonal constraints to undertaking bat surveys.

Bat Mitigation & Licensing

When bats are found at a site and will be affected by development, a mitigation strategy will need to be produced and included in the design scheme for the site, detailing a programme of mitigation measures to protect bats and their roosts from damaging activities of development. Before any work with the potential to result in disturbance or destruction of a bat roost proceeds (i.e. unlawful activities), a licence must be obtained from the statutory nature conservation organisation (e.g. Natural England).

Natural England operates 2 licensing systems where bats will be affected by development. The Bat Mitigation Class Licence (BMCL) is a streamlined licensing process, allowing the disturbance and / or capture of bats and / or damage or destruction of bat roost/s of Low conservation significance (i.e. feeding perches / roosts, day and night roosts), affecting no more than 3 of the more common species of bats present in small numbers. In the event that the site does not fall within the scope of the BMCL, it would be necessary to apply for a European Protected Species Mitigation Licence (EPSML). In either case, Licences will only be granted where it can be shown that there will be no detriment to the species of bat concerned and thus suitable mitigation measures will be required.

jh ecology is experienced in preparing and advising clients on bat mitigation strategies and licence applications and where the project requires can provide the following services:

  • Legal compliance advice, including preparation of licence applications.
  • Design of mitigation and compensation measures to avoid / reduce the risk of harm to bats during and post-works including creating, restoring or improving bat roosts and habitats (such as foraging areas).
  • ‘Tool-box’ talks to site contractors and ecological clerk of works (i.e. ECoW).
  • Post-mitigation population monitoring and site management advice.

Please contact us on or 01823 530 084 for further advice or help.