It depends. Cost per SF will vary by area, and by builder. If you use a production builder vs a non-production builder, as well as the materials you decide to put in your home. You could check with a local agent and get a general idea, but that is all it would be.
For example, if you want a home built with concrete block vs wood, expensive wood floors and ceramic tile or medium grade carpet, granite counter tops or ??? ( top of the range gourmet chef kitchen with cherry wood cabinets and an island with running water, sink, etc. - tile roof or architectural shingles? Pool or no pool? Solar, gas, electric?
As you can see from just the beginning of my questions, all these will factor in to the price per sq. ft, and it will vary by production or non production builder. Get yourself a good, experienced agent and start doing some research, only then will you kmow what you need to know.
Best Regards and good wishes!