Two-story house plans are extremely traditional. They are practical, in the sense that if the house lot is small, you can get more room by going up! Plus they offer the benefit of creating separate living zones. The bedrooms can be on the second floor, which is great for families. But that doesn't mean the master suite can't be on the first floor. And if you add a finished basement to a two-story house, well then you've got quite a lot of living space in a small foot print.