Filming of the series began at Leavesden Studios, Hertfordshire, England, in September 2000 and ended in December 2010, with post-production on the final film lasting until summer 2011. Leavesden Studios was the main base for filming Harry Potter, and it opened to the public as a studio tour in 2012 (renamed as Warner Bros. Studios, Leavesden).
when did they start filming the first harry potter movie
September 2000