Natterer's maternity roost at Peckforton castle

Case Study Image
1. Location

Geographical region: 
North West England
Name of council or planning authority : 
Cheshire East
Name of consultant: 
Stan Irwin (Tyrer Partnership)
Name of architect: 
John Edwards
2. Type and description of building

Type and use of building (domestic house, commercial, industrial, etc.): 
Castle Hotel
Approximate age (in years) or period of the building: 
160 years
Materials of the building (stone, brick, timber, etc.): 
Predominant landscape type around building (e.g. garden, urban, woodland, open farm fields): 
3. Details of proposed work and associated impacts

Type of impact to bats or roost: 
Roost modification
Date Timing of building/impact works (e.g. late spring, early summer) : 
Early spring
Description of building works or impact: 
Conversion of room into guest accommodation
4. Description of roost (before mitigation)

Bat species found on site: 
Natterer's bat - (M. nattereri)
Age (estimate of how long the roost has been in use): 
5 years +
Size (estimate of number of individuals using the roost): 
Use Type of roosts (e.g. hibernation, spring gathering, maternity, nursery, swarming): 
Location in building: 
Internal room within Castle hotel
Aspect (direction facing): 
South west
Description of immediate emergence environment in relation to the roost: 
Roost substrate (e.g. brick, stone, wood, roofing felt): 
Height of roost above ground: 
3 metres from internal floor level
Roof covering: 
Lighting levels inside roost (lux reading) - Day: 
Not taken
5. Description of access (before mitigation)

Size of access: 
Window opening of 300mm x 500mm
Location in building: 
External wall
Height of access points above ground: 
10 metres
Aspect (direction facing): 
South west
6. Description of mitigation

Type of mitigation and compensation: 
Retaining existing roosts in refurbished buildings
Objective of mitigation: 
To maintain a Natterer's maternity roost but facilitate the room for guest accommodation
Method to achieve objective: 
Creation of void above the guest room and adapt the exit/entry route
How is success of mitigation to be measured: 
Automatic bat detector, manual and CCTV monitoring already undertaken
Drawings or plans of the project: 
7. Monitoring Data

Average daily temperature: 
When this temperature data was measured: 
Evidence of bat use post mitigation: 
Fresh droppingss & bat presence 57 bats in June & 42 in August
How long did it take for bats/signs of bats to appear?: 
1 month
8. Measures of success
Based on the objective of the mitigation do you deem the mitigation to have been successful?: 
What alterations could be made to make the mitigation more successful?: 
None but measures are to be taken to ensure that the void in which the roost exists does not suffer from a significant temperature rise when the room is in occupation
Are there lessons from this project that you would like to highlight?: 
Cooperation with owners, understanding their requirements & concerns and full gathering of data associated with the roost before applying for a licence
9. Photos (before and after)

Before – inside of roost: 
Before, Inside of roost  - Roost 19/08/2013 - 1:33am
After – inside showing mitigation: 
Before, Indise of roost - Roost 19/08/2013 - 1:33am