At this point in the storyline, both the Old House and Collinwood sets were up all the time there was already the Josette's Room set up for goog old Joe. Add some woods, a cemetery, and Angelique's coffin area in "The House by the Sea," and you've probably got a full studio!
Of course, TPTB seemed unconcerned where BC slept, unless it was in his coffin. As a kid watching the show, I never took time to worry about these inconsistensies, as long as something else interesting or exciting was going on.
Petofi