Introduction

Project description
Conversion of barn (formerly a storage area for a farm) to residential dwelling. This involved removing day roosts for common pipistrelle and brown long-eared bat. A bat barn was provided as compensation.
Ecologist’s name and contact details
Martin O'Connor (Arbtech)
Planning authority
Cheshire East
Brief site description
Farm buildings surrounded by open pasture and hedgerows.

Pre-works roost structure

Type of structure
Building
Use
Agricultural Building
Condition
Not In Use
Approx. age
50 years
Main construction material of walls
Brick
Roof design
Pitched Roof
Roof material
Slate
Internal roof structure
Timber Frame

Pre-works roost description

Species
Brown long-eared bat
Number of bats max count
6
Type of roost
Day Roost
Evidence of bats
Bats Recorded Emerging/Re-entering
Roost location
Eaves
Aspect of roost
S
Height of roost entrance (m)
6m
Roost material(s)
  • slateTiles
  • Timber
Nearest commuting feature
Hedge
Distance to nearest commuting feature (m)
Not reported

Proposed works

Description of works
Bats were excluded from the existing structure using one-way exculsion flaps and a supervised roof strip. Roost loss was them compensated for by a bat loft in a purpose built garage/shed.
Type of impact upon the roost
Long-Term Roost Modification and Roost Loss

Proposed mitigations

Type of mitigation
Compensation
Specific technical detail of measure
Bat loft above a purpose-built garage provided as compensation. Size: 6m x 5m x 2,5m Materials: Rough sawn timber, bitumen felt Additional info: Situated over a garage at approx. 5.4m high. A vapour proof membrane laid between the garage ceiling and bat loft. Open at eaves. Bat tiles and wooden entrances created at the gable ends.
Roost location
Bat House
Aspect of roost
S
Height of roost entrance (m)
Not reported
Roost material(s)
  • Bitumen Felt
  • Timber Roof Frame
Nearest commuting feature
Hedge
Distance to nearest commuting feature (m)
Not reported.

Actual mitigations implemented

Type of mitigation
Compensation
Specific technical detail of measure
Bat loft above a purpose-built garage provided as compensation. Size: 6m x 5m x 2,5m Materials: Rough sawn timber, bitumen felt Additional info: Situated over a garage at approx. 5.4m high. A vapour proof membrane laid between the garage ceiling and bat loft. Open at eaves. Bat tiles and wooden entrances created at the gable ends.
Roost location
In Roof Void
Aspect of roost
N
Height of roost entrance (m)
Not reported
Roost material(s)
  • Bitumen Felt
  • Timber Roof Frame
Nearest commuting feature
Hedge
Distance to nearest commuting feature (m)
Not reported.
Internal temperature and humidity of roost
30 degrees

Monitoring data

Length of monitoring proposed
3 checks of the bat loft and 3 dusk surveys.
Frequency of monitoring
To be confirmed
Type of monitoring
Roost Inspection
Date and time
4th July 2011
Evidence recorded
Currently no evidence of use. Bats found to be using the converted barn.
Interventions made
None reported.

Final details