Americans smart-sizing their homes.

New homes, after doubling in size since 1960, are shrinking. Last year, for the first time in at least 10 years, the average square footage of single-family homes under construction fell dramatically, from 2,629 in the second quarter to 2,343 in the fourth quarter, Census data show.

Homes are becoming more about the amenities rather than the shear size.  New homes are designed so rooms serve more than one function.