On one end of the spectrum is Blu Homes (https://www.bluhomes.com/) which builds pre-fabricated homes that aren't quite so boxy as mobile homes. We looked at investing in them when they started up and perhaps getting one of their smaller units for a piece of land up in the Sierra foothills[1].
Shipping container homes are also a sort of niche thing at the moment. Realistically though it isn't the walls that cost the money on a house, its all the stuff that goes in the walls :-) (wiring, pipes, insulation, Etc.)
Shipping container homes are also a sort of niche thing at the moment. Realistically though it isn't the walls that cost the money on a house, its all the stuff that goes in the walls :-) (wiring, pipes, insulation, Etc.)
From an extreme perspective you have the Broad Group in China who was building pre-fab skyscrapers (https://en.wikipedia.org/wiki/Sky_City_(Changsha)) that would house a thousand families.
[1] I ended up doing neither for different reasons but I know a couple who bought one and they really enjoy it.