The Excalibur Estate is a post-war 1940s prefabricated housing estate in Catford, South London. The estate contains the last sizeable collection of post-war prefabricated houses in the United Kingdom. Despite its historical significance, demolition has been proposed for sometime and is scheduled to begin in 2013. English Heritage has granted listed building status to six of the estate's prefabs. The proposed demolition has led to campaigns from residents, English Heritage and the Twentieth Century Society to save the properties, and a legal challenge to prevent redevelopment if they are demolished and return it to parkland.