The Basic Notion of knowing the per sq ft cost for your Home Construction is not the right Parameter to understand/judge the exact Cost of Building your Home. 

To judge the right cost of construction you need to first understand the overall elements and specifications provided by a builder as a complete ready-to-move-in offering As, different people measure the sqft on a different basis for different types of areas like covered area, half-covered, etc. So, the better way is to always see the total cost for the pre-defined construction area.