@freemo @lovelylovely @dbc3
Well, the "pre-built home" phase began immediately after WWII but wasn't prevalent 50 years ago, I'm afraid.
But it did ramp back up again with housing developers' "community" house building which morphed into "home owners association" neighborhoods, gated communities and the like. Turns out that the original concept of "ticky-tacky" was good for commercial home builders.