Oxford has hundreds of 'beds in sheds'
24 June 2014 Last updated at 23:21 BST
There are several hundred "beds in sheds" - illegal homes built in back gardens - in Oxford, the city council has said.
Three buildings have been demolished since the authority was given £150,000 by the government to help enforcement teams crack down on the practice.
The flats were put up without planning permission to let out to tenants.
Ian Wright, from the environmental health team, said he was "disturbed" by the findings.
BBC Oxford's Helen Catt reports.