Ok, so we've now been told we need a bat survey. Does anyone have any experience of this, cost, time etc. Or recommendations? We're in the south east, in a 3 bedroom semi. We've lived here 7 years and have not seen or heard any evidence of bats. Our builder who is local and has worked in the area for 20 years has no experience of this either, so any help words of advice would be much appreciated. Many thanks.