Ozzy Osbourne's home improvement plans at his Buckinghamshire estate have been halted - because there are bats living there.
The Black Sabbath rocker - who is famously rumoured to have bitten the head off a live bat during one of the band's elaborate Gothic stage shows - has been refused planning permission to convert a barn into a two-bedroom home, unless he provides adequate protection for the bats.
The local council has rejected the planning application after "considerable evidence" of bats and owls were found there, the BBC reported.
The Osbournes must take special measures to protect the bats in order for the conversion to go ahead.
Chiltern District Council ordered two further surveys, which can only be carried out in the summer, to determine how many bats live in the barn and how they would be affected by any building work carried out on the farm at the Jordans estate, before permission can be granted.
All species of bat and their roosts are protected under the Wildlife and Countryside Act 1981 and The Conservation of Habitats and Species Regulations 2010.
A council spokeswoman said: "Mr Osbourne cannot convert his listed building until satisfactory surveys and related mitigation, allowing the bats and owls to remain living on the site, is submitted.
"We must be satisfied measures have been put in place to protect the animals before planning permission can be considered."
A spokesman for Ozzy said it was a "private matter".