Ashton Court

Case Study Image - Roost 13/06/2011 - 3:27pm
1. Location

Geographical region: 
South West England
Town: 
Bristol City
Name of council or planning authority : 
North Somerset Council
Name of architect: 
Cotterell Thomas & Thomas LLP
2. Type and description of building

Type and use of building (domestic house, commercial, industrial, etc.): 
Listed Gate House used as Residential Unit
Materials of the building (stone, brick, timber, etc.): 
Stone, brick, timber, concrete
Predominant landscape type around building (e.g. garden, urban, woodland, open farm fields): 
A rural landscape. It is part of Ashton Court Estate, which includes fields, woodland and ponds.
3. Details of proposed work and associated impacts

Type of impact to bats or roost: 
Roost modification
Description of building works or impact: 
Clackencombe Lodge is a Grade II* listed gate house, which is part of the Ashton Court Estate in Bristol. The lodge was going to be refurbished to create residential living space but needed to do so while still allowing for the 5 species of bat found on the site to continue to use the building.
4. Description of roost (before mitigation)

Bat species found on site: 
Greater horseshoe bat - (Rhinolophus ferrumequinum)
Lesser horseshoe bat - (R. hipposideros)
Common pipistrelle - (Pipistrellus pipistrellus)
Barbastelle - (Barbastella barbastellus)
Brown long-eared bat - (Plecotus auritus)
Age (estimate of how long the roost has been in use): 
several years, due to building falling into redudant use
Use Type of roosts (e.g. hibernation, spring gathering, maternity, nursery, swarming): 
maternity
hibernation
night roost
day roost
Location in building: 
throughout
Description of immediate emergence environment in relation to the roost: 
multiple exits
Evidence of insulation?: 
no
Height of roost above ground: 
At all levels, majority at upper floor and roof
Type and brand of roof lining material: 
no
Lighting levels inside roost (lux reading) - Day: 
daylight only
5. Description of access (before mitigation)

Size of access: 
multiple and varied - windows, doors, eaves etc. all in disrepair
Location in building: 
throughout
Height of access points above ground: 
all
Aspect (direction facing): 
all
6. Description of mitigation

Type of mitigation and compensation: 
Avoidance
Objective of mitigation: 
Create living accomodation along side allowing the bats to continue using the buillding, including attempt to enhance the roost for maternity use.
Method to achieve objective: 
Isolated the living accomodation from designated bat areas. Bat areas included access to full roof void, ensuring full length of roof open for 'light testing'. One tower allocated for bats, which created a route from the roof to ground level single story modern extension, which was modified to provide roosting ledges and maternity environment. All windows and doors were removed from the extension and the building disguised with planting. Its interior layout was design by a bat consultant. Bespoke exits and entrances into the roof and tower. Ensured canopy cover from the building to the adjascent woodland.
How is success of mitigation to be measured: 
Camera installed for ongoing montioring.
Materials: 
Extension - breeze block. Roof exit - lead. Tower entrance - timber.
Drawings or plans of the project: 
7. Monitoring Data

Evidence of bat use post mitigation: 
There has been a measured increase in the number of bats using the building. The maternity section is in use.
9. Photos (before and after)

After – outside showing mitigation: 
After, Outside showing roost location - Roost 13/06/2011 - 4:01pm
After – inside showing mitigation: 
Before, Indise of roost - Roost 13/06/2011 - 4:01pm

Have Your SayQuestions or suggestions?

Young bat

I happen to have a young bat flying around my house and close by neighbours i presume the little fella is lost his way from the family roost any one got any ideas of how i canhelp the little guy

BCT Helpline details

If you are concerned for the welfare of a bat please call the BCT Helpline who will be able to provide you with the best advice: 0345 1300 228. Many thanks.

Welcome to the neighbourhood?

I moved in here a few months ago and haven't seen a single bat once. I guess they like to keep themselves to themselves, and that's cool, but seeing as there are no neighbours for about a mile, and it can feel pretty isolated from time to time, it would be nice to have someone to nearby to drop in on and have a cup of tea with. Oh well... I know it's important not to disturb bats (they work shifts I think so need their sleep) so I'll wait for them to make the first move - maybe they'll pop by at Christmas, I'll keep some mince pies at the ready just in case.