It answer is in the tea leaves ... it depends on the overall size, the choice of equipment, amenities, finishes, and architect design fees. Design & Construction costs out of the ground are often $120/SF. Basement and garage square feet quantities are not typically included in the total residential cost per square foot numbers. Build a reserve amount of 15-20% of the anticipated total costs into your budget.
Charles Balducci 215.531.2000
Coldwell Banker Preferred
I agree with the answers below. Ground-up new construction will usually run about $100 per/sq ft (in the finished basement, as well).
Please let me know if you have any more questions.
Of course it depends on many factors, but most builders I am working with that do very good quality work are building for around $100 per square foot. If you would like more information, please do not hesitate to contact me.