The original foundation can become strong with basement underpinning. The structure base changes when the soil shifts. The process is to dig out the floor to several feet. The basement can be easily accessed. With underpinning, the integrity of the structure is uplifted. Contact Rock Bottom Underpinning for Basement Underpinning in Toronto. Contact Details Address 3-1750 The Queensway Suite 1206, Etobicoke, Ontario, M9C 5H5, Canada Open 24 Hours Phone No 4165463558