The House at the Edge of Magic (3 book series) by Amy Sparkes

Nine is an orphan pickpocket determined to escape her life in the Nest of a Thousand Treasures. When she steals a house-shaped ornament from a mysterious woman’s purse, she knocks on its tiny door and watches it grow into a huge, higgledy-piggeldy house. Inside she finds a host of magical and brilliantly funny characters, including Flabberghast – a young wizard who’s particularly competitive at hopscotch – and a hideous troll housekeeper who’s emotionally attached to his feather duster. They have been placed under an extraordinary spell, which they are desperate for Nine to break – and if she can, maybe they can offer her a new life in return…