Burj Khalifa-Time Line of Construction

January 2004	Excavation started
February 2004	Piling started
March 2005	Superstructure started
June 2006	Level 50 reached
January 2007	Level 100 reached
March 2007	Level 110 reached
April 2007	Level 120 reached
May 2007	Level 130 reached
July 2007	Level 141 reached - world's tallest building
September  2007	Level 150 reached - world's tallest free-standing  structure
April 2008	Level 160 reached - world's tallest man-made  structure
January 2009	Completion of spire - Burj Khalifa tops out
September  2009	Exterior cladding competed
January 2010	Official launch ceremony