Depends on many factors including soil type, water table height, drainage, etc. In many instances it would cost you many many times more to build underground t

Depends on many factors including soil type, water table height, drainage, etc. In many instances it would cost you many many times more to build underground than any savings in heating and cooling do to the problems with underground building poses In my area basements have continual problems with moisture penetration because we have high annual rain fall, soil that holds water, and high water tables making building under ground very very expensive and over 30+ years a continual maintenance problem for the owner