For houses built for sale, the SOC also gathers information on sales, registered at the time when a buyer signs a sale agreement or makes a deposit on the home, not the final closing. For new single-family homes sold in 2012, the average time from completion to sale is under one month. However, this average is highly skewed by a relatively small number of homes that are not sold prior or while under construction.
Looking at new single-family homes completed in 2012, more than three quarters of these properties were sold before or during the completion month, including 30 percent that were pre-sold (i.e., sold before being started). Only 6 percent of homes completed in 2012 remain unsold as of the first quarter of 2013. So, for most new single family homes there is no additional lag from completion to sale.
View this original post on the NAHB blog, Eye on Housing.