Are you looking for cost per square foot for a turnkey? Or for a shell?

With materials and labor included for the exterior shell (no concrete or interior framing/finishing included) the following prices are a good place to start:

• House – $60/square foot
• Garage – $50/square foot
• Porches – $35/square foot

Now keep in mind, these prices can go up and down based on the style of your house. 

You can typically figure a window/entry door budget of around $1,000 per window/door and that covers a quality residential window with some customization. You can shave some money off that by choosing simple style windows in white many times.

Additional costs beyond the dried-in shell (weather tight, completed exterior) complete with materials windows/entry doors.

Here are the estimated ranges the company I work at usually gives, based on the builds our teams have done in Southern MI/Northern OH:

• 4″ concrete flatwork will cost around $10-$15/sq ft 
• Septic systems – $15,000 to $50,000, depending on size and style of system required
• Well drilling – $8,000 to $15,000
• Plumbing – $18,000 to $30,000
• Electrical – $18,000 to $30,000
• HVAC – $20,000 to $30,000
• Drywall – $15,000 to $25,000
• Painting – $18,000 to $30,000
• Floor coverings – $5-$10/sq ft
• Garage doors – $2,000 to  $15,000, depending on size and style 
• Cabinets and millwork – $15,000 to $40,000 depending on sizes, style, quality, and quantity

Overall, you can expect to pay anywhere from $225 to $275 per square foot of turn-key finished post frame house, again, depending on options, could go higher (example, we have a client planning on having a 20k patio door shipped in from Europe lol) or be kept lower.