What is the biggest house?

The Aerium near Berlin is the largest uninterrupted volume in the world, with Boeing's factory in Everett, Washington, United States the largest building in the world by volume and the Aalsmeer Flower Auction Building in Aalsmeer, Netherlands the largest in area footprint, while the Dubai International Airport Terminal 3 in Dubai is the largest building in terms of total floor area. The surface area of the proposed Crystal Island complex in Moscow, Russia, is more than double that of the largest current building, though this project has been delayed by the global economic crisis.
The tallest building is Burj Khalifa in Dubai - 828 m