Sump Pump Replacement cost between $200-$650. This price assumes you currently have a sump pump installed and need to replace it, the price does not include the cost of digging and additional Plumbing work needed for a new system to be installed. If you do not currently have a sump pump installed and need a new sump pump, you would be looking at a cost of between $2000-$6000, becuase of the digging and other factors involved, and since most Plumbers charge by the hr, the longer they spend installing the pump, the more costly it would be. The installation also depends on the type of sump pump that needs to be installed. Pedestal Sump Pumps cost less to install than Submersible Sump Pumps. Homeowners on average reported to have paid around $390 to have their Sump Pump replaced.