How deep should footings be for a single storey extension?

How deep should footings be for a single storey extension? Depth of Footings 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. How deep should … Continue reading How deep should footings be for a single storey extension?