Re: US readers...
"FYI... in the UK, "castle homes" means homes that are castles. There are a fair few around..."
As I recall, those castles were dreadfully drafty and murderously expensive to heat.
Quite a few are also annoyingly damp.
I'll stick with masonry in part, wood in greater parts and reinforced with hubris, as all US homes are.
OK, I'll be reinforcing with concrete, but that isn't as humorous or accurate.