That's just one picture so I can't judge how they do things, but they brought AWIL back this year virtually the same and you better bet they didn't remake all of that.
And over at Busch Gardens, normally they only get one new house per year, meaning 6 out of the 7 get disassembled and reassembled year over year. Zombie Mortuary, for example, is the oldest house currently at the event. It's been there since 2011 with very minimal changes.