Were they using ICFs to build the new homes?
Insulating Concrete Forms (ICFs) have been in used in the Northeast for several years. We are living in a five year old home of my own design that has a foundation built using ICFs.
Using ICFs reduces labor and adds insulation.
I know a fellow here in our town who used ICFs to pour the foundation and walls of his new home.
Check out this ICF website.
http://www.korit.com/amvic.htm