Bush House is a Grade II listed building at the southern end of Kingsway between Aldwych and the Strand in London, England. It was conceived as a major new trade centre by American industrialist Irving T. Bush, and commissioned, designed, funded, and constructed under his direction. The design was approved in 1919, work began in 1925, and was completed in 1935. Erected in stages, by 1929 Bush House was already declared the "most expensive building in the world".