Depending on where you plan to build obviously will dictate your cost. Also, depending you plans after construction is done, will also adjust the price per square foot for the finished product. For example, if I were planning on renting my property out as opposed to selling it, I may not want to use the highest end finishes and stick with builder grade products. And on the other hand, if I were flipping, I may want to use better kitchen appliances, bathroom fixtures, etc.
But to answer your question, for construction ONLY, you will pay anywhere from $125 per square to $150 per square.