If you want to calculate the minimum size of the house in which to live comfortably, it should be the internal dimensions and volumes. To be warm, it needs a home with one floor, and if the ease of placement, the two storey. And the size of 6 * 12 is quite suitable.
With such dimensions to live a normal life with his family, the house should be on three floors. If the country in which the average temperature climate zone it is quite true.
