Basement Waterproofing Cost & Consumer Guide$8.97-$10.65 / Sq Ft for Interior Waterproofing$125  /Sq ft for Exterior Waterproofing$8,970 to $10,650   /1000 Sq Ft BasementAs you can imagine, many factors play a role in determining the cost for basement waterproofing. To help you better understand how much you should be paying, and where you can save some money, check