cost to replace a gfci outlet
1 Bathrooms, kitchens, laundry rooms and other moisture-prone areas (including the outdoors) need ground fault circuit interrupter (GFCI) outlets, which prevent shocks. 2  These are at the higher end of the scale, or it's about $60-$125 to replace an existing standard outlet with a GFCI receptacle. These are at the higher end of the scale, or it's about $60-$125 to replace an existing standard outlet with a GFCI receptacle. 2  If existing circuits don't have the capacity for another outlet, running a new 120V circuit off the electrical panel adds another $150-$250.