This part of Roost provides general principles on bat mitigation and compensation. The information on this page does not replace the need for using a qualified ecological consultant or going through the relevant licensing procedures. Please consult the Bat Mitigation Guidelines document for in-depth information about the principles on which bat mitigation should be based.


When undertaking building or development work where bats may be present, there are a number of general steps to help ensure successful mitigation for bats:

1. Contract an ecological consultant for advice and guidance throughout the project
2. Undertake a bat survey (at the appropriate time of year)
3. If bats are present, compile a mitigation/compensation plan or method statement for everyone involved, including architects and/or building contractors
4. Incorporate the bat survey report and mitigation plan/method statement into the planning application
5. Apply for planning permission
6. Apply for an EPS licence (if needed). The planning permission will be needed as part of the licence application
7. If a licence is granted, carry out works with ecologist supervision
8. Carry out a compliance check to ensure that mitigation is being properly implemented
9. Monitor the site after the completion of the mitigation to gauge response of the bat population to the mitigation


Mitigation refers to measures to protect the bat population from damaging activities and to reduce or remove the impact of development.

Compensation occurs in the form of roost creation, restoration or enhancement as a result of loss of breeding or resting places.

The main aim of Mitigation and/or Compensation is to allow for the Continued Ecological Functionality (CEF) of breeding sites and resting places so that the conservation status of bats is maintained or enhanced both during and after development. This means ensuring that the sites continue to maintain and provide the same elements needed by the bats to rest or to breed successfully in that site. For example, area, temperature, humidity, access etc. Maintaining CEF is therefore the guiding principle for all mitigation and compensation activities.

For clarity this site will use the term mitigation to encompass both mitigation and compensation.

All mitigation should first aim to AVOID impacts,  then MINIMISE impacts and as a last resortCOMPENSATE for remaining unavoidable impacts

The main components of mitigation may include one or more of the following:

  • Avoidance
  • Roost creation, restoration or enhancement
    • Retaining existing roosts and access points within refurbished buildings
    • Providing new roosts within buildings
    • Purpose-built new roosts
  • Long-term habitat management and maintenance
  • Post-development population monitoring