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Bat survey trigger list

bat survey trigger list

Types of development requiring bat surveys


A bat survey should be requested when seeking planning permission for the types of development and proposals listed as follows:


Conversion, modification, demolition or removal of buildings.


  • 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.
  • Buildings 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 suitable for bats.


Development affecting built structures


  • Tunnels, mines, kilns, ice-houses, military fortifications, air-raid shelters, cellars and similar underground ducts and structures; unused industrial chimneys that are unlined and brick/stone construction.
  • Bridge structures, aqueducts and viaducts (especially over water or wet ground)


Floodlighting of valuable habitats or structures


  • Churches and listed buildings, green space (e.g. sports pitches) within 50m of woodland, water, field hedgerows or lines of trees with connectivity to woodland or water.
  • Any building meeting the criteria listed above.


Felling, removal or lopping of woody vegetation


  • Woodland.
  • Field hedgerows and/or lines of trees with connectivity to woodland or water bodies.
  • Old and veteran trees that are more than 100 years old.
  • Mature trees with obvious holes cracks or cavities, or which are covered with mature ivy (including large dead trees).


Proposals affecting water bodies


  • Development in or within 200m of rivers, streams, canals, lakes, reedbeds or other aquatic habitats.


Proposals located in or immediately adjacent to valuable geological formations


  • Quarries or gravel pits.
  • Natural cliff faces and rock outcrops with crevices or caves and swallets.


Proposals for wind farm developments


  • Multiple wind turbines
  • Single wind turbines


All proposals where bats are known to be present


  • This may include proposed development affecting any type of buildings, structures, feature or location.
  • Where large scale development is proposed less than 10km from a roost of international importance.