How far down does a garage foundation have to be in the ground?
How far down does a garage foundation have to be in the ground? Depth: Footings should extend to a minimum depth of 12 inches below previously undisturbed soil. Footings also must extend at least 12 inches below the frost line (the depth to which the ground freezes in winter) or must be frost-protected. Does your garage have to be lower than your house? According to the International Residential Code (IRC), the garage does not have to be lower than the house, but it has to have a slope leading towards the vehicle entry doorway. Do you need to dig foundations...