I'd actually disagree. Last years house devoted about 6-7 scenes/rooms per season.
Asylum: asylum facade and/or present day asylum with present day Bloody Face, Woods w/ monsters, death tunnel with aliens, exorcism room, main rec room, Bloody Face's torture room, Sister Jude's office during Christmas
Coven: morgue during resurrection, Madame LaLaurie's torture chamber, outside house during zombie attack, inside house with Axe Man and/or board room attack by Axe Man, general voodoo ceremony and/or Papa Legba room
I will agree that Roanoke def could fill its own entire house, but that I look for Uni to combine seasons 2,3, and 6 like they did last year.