| I think measuring per person is pretty misleading. A single person living in a 25m^2 appartment would be quite cramped. A family with two young kids living in 100m^2 is pretty spacious. So if you look at living space per person, then societies with smaller household sizes will appear to have more living space per person. so if you measure that, you also have to compare how many people are in households as well. |
Another thing to consider when comparing countries is what is considered "living space" and what is not - some areas have large porches that are not considered "living space" even though they serve similar functions to what a living room might in other parts of the world.