<P> On July 11, 2016, preliminary shooting took place in Port Hope Town Hall, Memorial Park cenotaph, Queen Street, between Walton and Robertson streets and the Capitol Theatre . On July 12, 2016, filming occurred between the intersection of Mill and Walton street, Walton Street bridge, and in front and behind 16--22 Walton Street and Port Hope Town Hall . Other shooting locations included Queen Street between Walton and Roberston street, and Memorial Park, on July 13 . It was also reported, on July 14, that filming had been set up on the alley between Gould's Shoe's and Avanti Hair Design, and John and Hayward streets . Filming moved to Cavan Street, between Highland Drive and Ravine Drive, and Victoria Street South, between Trafalgar Street and Sullivan Street, on July 15 . Filming in Port Hope ended on July 18, at Watson's Guardian Drugs . </P> <P> Oshawa had been chosen by producers of It as the next filming location, and on July 20, 2016, filming notices were sent out to homes in the area of Eulalie Avenue and James Street, near downtown Oshawa, advising residents that filming would take place in the area from August 5 to August 8, 2016 . On July 29, 2016, it was announced the crew had worked on the formerly vacant lot at the dead end of James Street constructing the set, in the form of a dilapidated old house . It was also remarked that the structure is a facade built around scaffolding that would be used for exterior shots . The set was composed of pre-fabricated modules that were trucked in and put into place by IATSE carpenters . </P> <P> On July 18, 2016, production crews had arrived in Riverdale, Toronto, with filming beginning at 450 Pape Ave, which is home to a circa 1902 heritage - designated building called Cranfield House, up until August 19, 2016 . It was reported on September 4 that filming had wrapped in Oshawa, which included the haunted house location, as well as on Court and Fisher streets . Principal photography was confirmed to have ended in Toronto on September 21, 2016, with an altered shooting schedule occurring from June 27 to September 21, 2016, and post-production initially beginning on September 14, 2016 . </P> <P> On August 16, 2016, in an interview with Entertainment Weekly, costume designer Janie Bryant spoke of crafting Pennywise's form - fitting suit and the inspirations it drew from--involving a number of eras--among them Medieval, Renaissance, Elizabethan, and Victorian . Bryant explained that the costume incorporates all these otherworldly past lives, highlighting the point that Pennywise is a clown from a different time . In designing Pennywise's costume, Bryant included a Fortuny pleating, which gives the costume an almost crepe - like effect, to which Bryant remarked, "It's a different technique than what the Elizabethans would do . It's more organic, it's more sheer . It has a whimsical, floppy quality to it . It's not a direct translation of a ruff or a whisk, which were two of the collars popular during the Elizabethan period ." </P>

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