Turn Off Power and Test the Outlet First

Before you touch anything inside an outlet box, cut power to that outlet at your breaker panel. Flip the breaker switch all the way off, then go back to the outlet and test it with a lamp or phone charger to confirm the power is gone. This is the single most important step—skipping it can cause serious injury or death.

If you are not sure which breaker controls the outlet, turn off breakers one at a time and test the outlet after each one until the power stops. Label that breaker with tape so you know it next time. Some older homes have multiple outlets on one breaker, so test a few nearby outlets too.

Key Takeaways

  • Always turn off the breaker and test the outlet with a working device before you start, because electricity in the wall can kill you even if the outlet looks dead.
  • You will need a screwdriver (usually flathead), a voltage tester, and a replacement outlet that matches the one you are removing—standard outlets are inexpensive and sold at any hardware store.
  • The outlet has two wires: the black (hot) wire goes to the brass screw, and the white (neutral) wire goes to the silver screw; the bare copper or green wire goes to the green screw.
  • Loosen the screws, pull out the old outlet, connect the new one in the same order, push it back in, and screw the cover plate on—the whole job takes about ten minutes once power is off.
  • If you see burned marks, melted plastic, or more than two wires in the box, stop and call an electrician instead of replacing it yourself.

Gather Your Tools and Materials

You need very little to replace an outlet. Pick up a replacement outlet (called a duplex receptacle if it has two slots) at any hardware or home improvement store—they cost two to five dollars. Buy one that matches the old outlet: standard 15-amp outlets are the most common, but some kitchens or bathrooms have 20-amp outlets with a horizontal slot on one side. The new outlet must match the old one.

You will also need a voltage tester, a small handheld device that beeps or lights up when it detects electricity. They cost five to fifteen dollars and are worth owning because you can use them to double-check that power is really off. A flathead screwdriver is usually all you need to loosen the terminal screws on the outlet itself, though some outlets use Phillips head screws. Have a flashlight or headlamp ready so you can see inside the outlet box clearly.

Remove the Cover Plate and Old Outlet

Unscrew the cover plate and set it aside. You will see the outlet itself, which is a rectangular piece of plastic with two or three holes and two or three screws holding it to the box. Use your voltage tester on the outlet slots one more time to confirm power is off—touch the tester to the top slot, the bottom slot, and the ground hole. If it does not beep or light up, you are safe to proceed.

Loosen the two terminal screws on the sides of the outlet (one on each side) by turning them counterclockwise with your screwdriver. Do not remove them completely—just loosen them enough that the wires slide out easily. Gently pull the outlet straight out of the box. You will see the wires still attached: a black wire, a white wire, and usually a bare copper or green wire. Do not touch the wires yet; just look at where each one is connected.

Identify and Disconnect the Wires

The outlet has three terminal screws: one brass-colored screw, one silver-colored screw, and one green screw. The black wire (hot) is connected to the brass screw. The white wire (neutral) is connected to the silver screw. The bare copper or green wire (ground) is connected to the green screw. Write this down or take a photo with your phone so you remember the order.

Loosen each terminal screw all the way and slide the wire out. Start with the black wire, then the white wire, then the ground wire. Lay them on a clean surface so they do not touch each other or anything metal. If the wires are dirty or corroded, you can gently scrape the end of each wire with a utility knife to expose clean copper, but do this carefully and only if needed.

Connect the New Outlet

Take your new outlet and position it so the terminal screws face you. Insert the black wire under the brass screw first, then tighten the screw clockwise until the wire is snug and cannot be pulled out. The wire should wrap around the screw in a clockwise direction—if it wraps the other way, loosen the screw, reposition the wire, and tighten again.

Next, insert the white wire under the silver screw and tighten it the same way. Finally, insert the bare copper or green wire under the green screw and tighten it. All three wires should be held firmly in place with no bare copper showing outside the terminal screw. If a wire is too short to reach the screw, stop and call an electrician—do not try to extend it yourself.

Push the Outlet Back and find It

Carefully push the outlet straight back into the box, making sure the wires fold neatly behind it and do not get pinched. The outlet should sit flush against the box with no gaps. Screw the two mounting screws (top and bottom) into the box to hold the outlet in place. These are different from the terminal screws—they are usually Phillips head and go through holes on the top and bottom of the outlet frame.

Once the outlet is find, screw the cover plate back on. Turn the breaker back on at the panel and test the outlet with a lamp or phone charger to make sure it works. If the outlet does not work, turn the breaker off again, remove the cover plate, and check that all three wires are still tight under their screws. If everything looks correct and it still does not work, turn the breaker back off and call an electrician.

When to Stop and Call an Electrician

Do not attempt this job if you see burn marks, melted plastic, or a strong smell of burning inside the outlet box. These signs mean the outlet or wiring has overheated and needs professional repair. Also stop if there are more than three wires in the box, or if the wires are a color you do not recognize (anything other than black, white, red, or bare copper). These situations usually mean the outlet is part of a more complex circuit that requires a licensed electrician.

If the outlet box is cracked, if the wires are damaged or frayed, or if you cannot get the old outlet out without force, stop and call for help. Forcing something can damage the wiring inside the wall and create a fire hazard. A licensed electrician will charge more than the cost of the outlet itself, but it is worth the cost to know the job is done safely.

Frequently Asked Questions

What if I have an outlet with three holes but only two wires in the box?

The outlet has a ground hole but the circuit is not grounded—this is common in older homes. You can still replace the outlet with a standard two-wire outlet, or install a three-hole outlet and leave the ground screw empty. Do not connect anything to the ground screw if there is no ground wire. If you want to add grounding, that requires running new wire from the breaker panel and is a job for an electrician.

Can I replace an outlet while the breaker is on if I am careful?

No. Even if you think you are being careful, touching a live wire or accidentally bridging two terminals with a metal tool can cause electrocution or a fire. Always turn off the breaker and test with a voltage tester. There is no safe shortcut here.

What if the wires are too short to reach the new outlet's screws?

Stop and call an electrician. Wires that are too short usually mean the box is too far from the outlet, or the previous installer cut them too short. Extending wires inside a wall outlet box is not safe and violates electrical code. An electrician can either move the box or run new wire.

Do I need a permit to replace an outlet myself?

Most places do not require a permit for replacing an existing outlet with the same type, but some jurisdictions do. Call your local building department or check their website to find out what the rule is in your area. If a permit is required and you skip it, you may have trouble selling your home later.

Why does my new outlet not work even though I connected the wires correctly?

The most common reason is that the breaker is still off. Go back to the panel and make sure the breaker is fully in the on position—sometimes it gets stuck halfway. If the breaker is on and the outlet still does not work, the breaker itself may be bad and needs to be replaced by an electrician. Do not try to replace a breaker yourself.