Former Stable Block

Case Study Image - Roost 17/06/2011 - 5:40pm
1. Location

Geographical region: 
North West England
Town: 
Northwich
Name of council or planning authority : 
Vale Royal Borough Council
Name of consultant: 
Ecology Services UK Ltd
Name of architect: 
Bowker Sadler Partnership
2. Type and description of building

Type and use of building (domestic house, commercial, industrial, etc.): 
Former stable
Approximate age (in years) or period of the building: 
30 years
Materials of the building (stone, brick, timber, etc.): 
Brick walls, slated roof
Predominant landscape type around building (e.g. garden, urban, woodland, open farm fields): 
Large, mature, private garden within parkland estate. Landscape features include pasture, mature broadleaved trees, ponds and broadleaved woodland.
3. Details of proposed work and associated impacts

Type of impact to bats or roost: 
Roost loss
Date Timing of building/impact works (e.g. late spring, early summer) : 
Early spring
Description of building works or impact: 
Demolition of old stable block and construction of new replacement stable block.
4. Description of roost (before mitigation)

Bat species found on site: 
Common pipistrelle - (Pipistrellus pipistrellus)
Soprano pipistrelle - P. pygmaeus)
Age (estimate of how long the roost has been in use): 
Estimated at least 5 years
Size (estimate of number of individuals using the roost): 
Maximum of 4 adult pipistrelles observed at any one time.
Use Type of roosts (e.g. hibernation, spring gathering, maternity, nursery, swarming): 
hibernation
day roost
Location in building: 
Beneath ridge tiles and beneath external wooden wall cladding
Aspect (direction facing): 
Cladding = west facing, roof pitches = north and south facing
Description of immediate emergence environment in relation to the roost: 
Large, mature broadleaved trees, amenity grassland, tall brick walls
Roost substrate (e.g. brick, stone, wood, roofing felt): 
Brick (beneath cladding), slates and felt (beneath ridge tiles)
Evidence of insulation?: 
no
Height of roost above ground: 
Cladding = 2.5 metres, ridge = 5.5 metres
Roof covering: 
Slates
Lighting levels inside roost (lux reading) - Day: 
Not possible to measure
5. Description of access (before mitigation)

Size of access: 
20mm
Location in building: 
At base of ridge tiles and at lower edge of wooden wall cladding
Height of access points above ground: 
Cladding = 2.5 metres, ridge = 5.5 metres
Aspect (direction facing): 
Cladding = west-facing, ridges = north and south-facing
6. Description of mitigation

Type of mitigation and compensation: 
Providing new roosts
Objective of mitigation: 
To provide suitable replacement features (including roost environments) for the roost features to be affected by the development
Method to achieve objective: 
1. Identify and describe roost features 2. Identify use by bats 3. Design mitigation using appropriate materials 4. Supervise installation of mitigation 5. Monitor mitigation features and assess use by bats 6. Alter mitigation where necessary to enable use by bats
How is success of mitigation to be measured: 
Measure 1 – bats and/or signs of bats are present in the same quantity as during the original surveys on which mitigation was based Measure 2 – bats are exhibiting the same type of usage as that observed during the original surveys on which mitigation was based Measure 3 – all mitigation specified has been implemented as per the mitigation proposal
Location: 
On and in immediate vicinity of original roost structure
Size: 
Box height = 800mm Box width = 450mm Box depth (back to front) = 150mm Width of crevices = 20mm. New stable approx 30m x 10m
Materials: 
Boxes = marine plywood, new stable = European oak boards
7. Monitoring Data

When this temperature data was measured: 
2011
Evidence of bat use post mitigation: 
Bats and bat droppings found during and after the development. Maximum of 8 pipistrelles found at any one time in the group of 6 bat houses. Bats occupying the bat houses in all seasons of the year. All bat houses used at some time during the monitoring. Bat droppings found on the outside of the new stable.

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