<P> Live - action filming took place in England and Scotland for exterior locations and Leavesden Film Studios in Watford for interior locations from February to November 2006, with a one - month break in June . Post-production on the film continued for several months afterwards to add in visual effects . The film's budget was reportedly between £ 75 and 100 million ($150--200 million). Warner Bros. released the film in the United Kingdom on 12 July 2007 and in North America on 11 July, both in conventional and IMAX theatres; it is the first Potter film to be released in IMAX 3D . </P> <P> As of December 2017, Order of the Phoenix is the 44th - highest - grossing film of all time, and a critical and commercial success . The film opened to a worldwide 5 - day opening of $333 million, fourteenth all - time, and grossed nearly $940 million total, second to Pirates of the Caribbean: At World's End for the greatest total of 2007 . The film was nominated for two BAFTA Film Awards in 2008 . </P> <P> During another summer with his Aunt Petunia and Uncle Vernon, Harry Potter and Dudley are attacked by Dementors . After using magic to save Dudley and himself, Harry is expelled from Hogwarts, but the decision is later reversed after a hearing at the Ministry of Magic . Harry is whisked off by a group of wizards including Mad - Eye Moody, Remus Lupin, and several new faces, including Nymphadora Tonks and Kingsley Shacklebolt, to Number 12, Grimmauld Place, the childhood home of his godfather, Sirius Black . The building also serves as the headquarters of the Order of the Phoenix, a secret organisation founded by Albus Dumbledore, informs Harry Potter that the Ministry of Magic is oblivious to Lord Voldemort's return . At the Order's headquarters, Sirius Black, mentions that Voldemort is after an object he did not have during his previous attack . </P> <P> Back at Hogwarts, Harry learns that Minister of Magic Cornelius Fudge has appointed a new Defence Against the Dark Arts professor: Dolores Umbridge . She and Harry immediately clash, and she punishes Harry for his "lies" by forcing him to write a message with a magic quill, scarring his hand . When Ron and Hermione notice Harry's scars they are outraged, but Harry refuses to go to Dumbledore, who has distanced himself from Harry since the summer . As Umbridge's control over the school increases, Ron and Hermione aid Harry in forming a secret group to train students in defensive spells, calling themselves "Dumbledore's Army". Umbridge recruits the Slytherin students to expose the group . Meanwhile, Harry and Cho Chang develop romantic feelings for each other . </P>

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