How to Install a GFCI Outlet in a Bathroom

Ground Fault Circuit Interrupter outlets are not optional in bathrooms—they're code, and they exist because water and electricity demand respect. A GFCI detects the tiny current leaks that happen when water splashes near an outlet or when someone reaches into a wet sink, and it cuts power in milliseconds. Installing one is straightforward wiring work that any homeowner with a screwdriver and basic comfort around outlets can handle. You're not running new circuits or breaking walls; you're swapping one outlet for another, which means this is genuinely beginner-level work that makes your bathroom materially safer. The catch is that you have to work live or dead correctly—either the power is off while you work, or you're absolutely certain it stays on. There's no in-between. Once you've confirmed the breaker is off and the power is dead, the actual installation is a five-minute job. The testing at the end is where you prove it works.

  1. Turn off power at the breaker. Locate the correct breaker for the bathroom outlet by flipping it off. Use a non-contact voltage tester on the existing outlet to confirm the power is actually dead. Touch the tester to the outlet slots; if it doesn't light or beep, power is off and you're safe to proceed.
  2. Remove the cover plate and outlet screws. Unscrew the cover plate from the wall. Then unscrew the two vertical screws holding the outlet body in the electrical box—these are the screws on the top and bottom of the outlet face, not the terminal screws. Once those are loose, carefully pull the outlet out of the box without yanking on the wires.
  3. Disconnect the old outlet. Note the wire positions before you touch anything—hot (usually black) on the brass terminal, neutral (white) on the silver terminal, ground (bare copper) on the green screw. Loosen each terminal screw counterclockwise, remove the wires, and set the old outlet aside. If wires are stripped or corroded, trim ¾ inch of fresh insulation off with a wire stripper.
  4. Connect wires to the GFCI inlet terminals. The GFCI has two sets of terminals: the inlet (where the power comes in) and the load (for protecting downstream outlets). Insert the hot wire into the brass inlet terminal screw, tighten it firmly, then do the same with the white neutral wire on the silver inlet terminal screw. Secure the bare copper ground wire on the green screw. Make sure each wire is looped clockwise under the screw head so it tightens as you turn the screw.
  5. Push the GFCI into the box and secure. Carefully fold the wires back into the electrical box so they don't get pinched when you push the outlet in. Align the GFCI body with the box opening and push it straight in until the outlet face is flush with the wall. Install the two vertical mounting screws (top and bottom) and tighten them snug, but not so hard you crack the plastic.
  6. Attach the cover plate. Screw the cover plate onto the GFCI outlet, centering it so the gaps are even on all sides. Tighten the plate screw just enough to hold it; over-tightening cracks the plate.
  7. Turn power back on and test. Go back to the breaker panel and flip the breaker back on. The outlet is now live. Press the TEST button on the GFCI face—the outlet should immediately lose power and you'll hear or feel a click. Press the RESET button to restore power. If this happens, the GFCI is working correctly.
  8. Optional: Protect downstream outlets on the same circuit. If this bathroom circuit has other outlets downstream (in the hallway or shared wall), you can connect them to the LOAD terminals on the back of the GFCI. This extends GFCI protection to those outlets without adding a second GFCI. If you're only protecting this one outlet, leave the LOAD terminals empty.