Production timeline
From greenlight to Platform Nine and Three-Quarters.
A compact chronology of the project, with changed release information retained rather than rewritten out of history.
Series ordered
Warner Bros. Discovery announces a long-form television adaptation intended to revisit the seven novels.
Creative leadership announced
Francesca Gardiner becomes showrunner and executive producer; Mark Mylod is set to direct multiple episodes and executive-produce.
Leavesden production plan confirmed
The official site says production will begin in summer 2025 at Warner Bros. Studios Leavesden and promises characters not seen in the films.
First adult cast announced
John Lithgow, Janet McTeer, Paapa Essiedu, Nick Frost, Luke Thallon and Paul Whitehouse join the ensemble.
Main trio confirmed
Dominic McLaughlin, Arabella Stanton and Alastair Stout are announced after tens of thousands of auditions.
Principal production begins
HBO formally starts production at Leavesden and releases the first image of McLaughlin in costume.
Location production expands
Crews are reported in London, Hertfordshire, Cornwall, Devon, North Yorkshire and Brittany. Each location has a different evidence level.
First teaser and debut window
The first season is formally titled Harry Potter and the Philosopher's Stone and dated for Christmas 2026.
Season two renewed
HBO greenlights the adaptation of Harry Potter and the Chamber of Secrets ahead of the first-season premiere.
Lockhart casting changes
Kit Harington is reported to replace Nicholas Hoult after Hoult's earlier official announcement.
Season-one debut
Scheduled on HBO and HBO Max where available, including the UK and Ireland.