Um. Yes, they do. I'm sorry if you haven't really travelled that much in your lifetime, but I've not only visited many states but have lived in 6 of them, east and west coast. When you drive around an economic area, those who live within that area have similar technology and funds, hence they have similar domiciles. If you drive across the country and go to another similar economic area, it will look just like it. The plants may be different and there may be small modifications for climate, but they can only afford/do the same things.
But it wasnt always like that, which has only really come into being in modern times with "factory standard" like structures. Way back when, people made very good use of the surroundings and environmental factors, as well as the many many different building techniques of every little creed and culture that used to be around. You dont see them much now days though because they all died out or were assimilated into other larger/dominant cultures.
In the game universe set in ye' old times, especially one as diverse in lore and culture as TES, we should be seeing a lot of uniqueness in architecture and use of the surrounding environment.
*Edit* sorry for the double post.