It will depend on the builder and what you want and also your lot costs.
Perhaps anywhere from $100-$200/sqft depending on what you put in it.
For example what type of appliances do you want....do you want builder grade or do you want professional restaurant type equipment like SubZero Refridge and heavy duty Wolf or Thermador range?
Do you want polished concrete floors or do you want carpet or hand scraped hardwood throughout.
You can see how the costs can change.
Also can depend if you buy the lot first or if you build on their lot.
Does the lot need prep?
Are their utilities in place?
Probably best to sit down with a builder and price out what you want.
Also if you want a resale, there is a pretty nice one on the market now, just over 5000sqft for $850,000.
See the link below for details.