For larger scale "production" type projects the costs are probably a little under $100 per square foot.
That number is very dependent upon the size of the house and the number of bathrooms and kitchens and, of course, the quality of finishes.
So, for a one home project, figure $100 and then add on upgrades beyond basic construction, concrete work (flatwork), landscaping, etc.
It is easy to spend $200 to $300 or more per square foot, and that is before the land cost.