This could be the cheapest house in Mayfair — despite being a design classic. A rare post-war French prefabricated building by architect and designer Jean Prouvé has been erected in Berkeley Square before it is sold at auction. It is one of many made in the 1940s as an affordable response to the housing crisis after World War II. They were built from steel, wood and a little aluminium and designed for construction in a day, but only a handful are thought to have survived. This one, called the Demountable House, appears to have been used as a boathouse before its restoration, and auctioneers Phillips expect it will make between £600,000 and £800,000.
