What percentage of rural buildings have been moved or built out of salvaged materials? A substantial number of buildings I have worked on have reused timbers, foundations which do not match the age of the frame or a known history of being moved. I would guess 25% of the buildings I have worked on have been moved or recycled.

The closer you look the more you see.
"Heavy timber framing is not a lost art" Fred Hodgson, 1909