Though the house was built in its entirety, it had to be torn down at the end of the shoot in order to make space in the studio.
Everything in the house was made for the house. Nothing was reused from salvaged parts.
When del Toro pitched the film to Charlie Hunnam he told the actor "that he'd be playing the damsel in distress", and Hunnam was immediately sold on the movie.
Many pieces of furniture in the film were made in two sizes. When a character sits on it or appears on its background, it can show certain emotion. Bigger size - to show character's weakness and tenderness, smaller - to show their strength and determination.