This article about for Howl's Castle, For the film see Howl's Moving CastleHowl's Castle is a main moving location in Howl's Moving Castle and first book.
In the meadow, the house and the castle seem to be interchangeable, with some doors and windows opening to be castle, while others open to Porthaven (or after the move, Market Chipping). This could be a reference to be windows in the original novel that opened to places other than Porthaven/Market Chipping. The castle ,is quiet different in the movie. The movie version... Aw, you know!
Howl's Castle in make on CGI graphic by animators of Studio Ghibli.