Calculated Risk posts this data, related to new household formation, regularly. It is always interesting:

http://www.calculatedriskblog.com/2013/01/new-home-sales-and-distressing-gap.html

If you assume that the sale of a new home (not a resale home) represents a new household formation, you can see the difference in hew household formation on his graph. New household formation rate is way down from the peak. Even down from well before the peak.