 For example, Norwich City Council calculated in 2006 that 36% still needed refurbishment.Other local authorities, such as the London Borough of Lewisham felt unable to meet the 2010 target and applied for extensions of time to 2012 on the grounds that the works required major regeneration.The policy led to the demolition of some tower blocks and prefabricated buildings which were deemed beyond repair or too expensive to refurbish.