Most capacious building

The world's largest building by volume is the Boeing Company's main assembly plant in Everett, Washington, USA, which has a total volume of 13.4 million m³ (472 million ft³), and an indoor floor area of 39.8 ha (98.3 acres). The building has grown massively since it was completed in 1968, when its volume was 5.564 m³ (196.476 million ft³). The site covers some 414 ha (1,025 acres). The building needs to be big, because Boeing's 747, 767 and 777 aircraft, among the largest in the world, are assembled there.