What You Need to Do Before You Start
Replacing an outlet is a task you can do yourself if you follow the safety steps exactly. The most important step happens before you touch anything: turn off power to that outlet at the circuit breaker, then test the outlet with a voltage tester to confirm the power is actually off. A voltage tester is a small handheld device that costs $10 to $20 and tells you whether electricity is still flowing. Do not skip this step—it is the difference between a safe job and a dangerous one.
Once power is confirmed off, you will remove the old outlet, disconnect the wires, connect those same wires to the new outlet in the same order, and screw the new outlet back into the wall box. The whole job takes 15 to 30 minutes if you work slowly and carefully. You do not need a license or a permit to replace an outlet in your own home in most places, but check your local building code if you are unsure.
Key Takeaways
- Always turn off power at the circuit breaker and test with a voltage tester before touching any wires.
- The three wires you will disconnect are black (hot), white (neutral), and bare copper or green (ground), and they must go back on the new outlet in the same spots.
- A standard outlet replacement takes 15 to 30 minutes and requires only a screwdriver and a voltage tester.
- If you see aluminum wires instead of copper, or if the outlet is in a bathroom or kitchen, stop and call an electrician—those situations need special handling.
Gather Your Tools and Materials
You need very little to replace an outlet. Get a voltage tester (also called a non-contact tester), a flathead screwdriver and a Phillips screwdriver, and a new outlet that matches the old one. Most homes use 15-amp outlets, which look like two vertical slots with a round hole below them. If you are not sure what amp rating your old outlet is, look at the number stamped on the face or bring a photo to the hardware store.
The voltage tester is the one tool you cannot skip. It looks like a pen and costs $10 to $25. When you touch it to an outlet or wire, it beeps or lights up if power is present. This is how you confirm the power is actually off before you start work. A multimeter can do the same job but is more complicated to use if you have never used one before.
Turn Off Power and Test the Outlet
Go to your circuit breaker panel and find the breaker that controls the outlet you are replacing. If your breakers are labeled, this is straightforward. If they are not, turn on a lamp plugged into that outlet, then flip breakers one at a time until the lamp goes dark. Flip that breaker all the way to the OFF position. Do not leave it in the middle.
Go back to the outlet and plug in a lamp or phone charger to confirm it is dead. Then take your voltage tester and touch it to both slots of the outlet. If the tester beeps or lights up, power is still on—go back to the breaker panel and try a different breaker. Once the tester stays silent and dark, you have found the right breaker and the power is safely off. Test the outlet one more time before you unscrew anything.
Remove the Old Outlet
Unscrew the cover plate (the plastic or metal face) and set it aside. You will see two screws holding the outlet itself into the wall box—one at the top and one at the bottom. Unscrew both of these. Gently pull the outlet straight out toward you. You will now see three wires connected to the back or sides of the outlet.
Look at where each wire is attached. The black wire (hot) usually connects to a brass-colored screw. The white wire (neutral) connects to a silver-colored screw. The bare copper or green wire (ground) connects to a green screw. Write down or take a photo of this arrangement before you disconnect anything. Then loosen each screw and pull the wire out. If the wire is wrapped around the screw, unwind it gently.
Connect the New Outlet
Take the new outlet and look at the back. You will see the same three colored screws: brass, silver, and green. The wires go back exactly where they came from. Loosen the brass screw and insert the black wire under it, then tighten the screw firmly. Loosen the silver screw and insert the white wire, then tighten. Loosen the green screw and insert the bare copper or green wire, then tighten.
Pull gently on each wire to make sure it does not slip out. The wire should be held tight under the screw head. If a wire is too short to reach the screw, you may need to strip a small amount of insulation from the end, but this is rare in a replacement job. Once all three wires are connected, carefully push the outlet back into the wall box and screw it in at the top and bottom. Screw the cover plate back on.
Turn Power Back On and Test
Go back to the circuit breaker and flip the breaker back to ON. Return to the outlet and test it with a lamp or phone charger. If it works, you are done. If it does not work, turn the breaker back off, check that all three wires are still tight under their screws, and try again.
If the outlet still does not work after you have checked the connections twice, turn the breaker off and leave it off. This usually means the breaker itself has tripped or failed, or there is a problem elsewhere on that circuit. Call an electrician at this point rather than trying to troubleshoot further.
When to Stop and Call an Electrician
Do not attempt this job if you see aluminum wires instead of copper. Aluminum wires need special handling and should only be worked on by a licensed electrician. Also stop if the outlet is in a bathroom or kitchen—these locations require GFCI outlets (ground fault circuit interrupter), which look different and have a TEST and RESET button on the face. GFCI outlets have their own wiring rules and are worth having an electrician install.
If you see any burn marks, melted plastic, or a burning smell coming from the outlet, do not touch it. Turn off the breaker and call an electrician. These are signs of a serious electrical problem that needs professional attention. Similarly, if the outlet box itself is cracked or damaged, or if you cannot reach the wires comfortably, stop and call for help. A 30-minute job is not worth an injury.
Frequently Asked Questions
What if the wires are too short to reach the new outlet's screws?
This is rare in a replacement, but if it happens, you can strip about half an inch of insulation from the end of the wire and try again. If the wire is still too short, you will need to add a short extension wire using a wire connector (a small plastic cap that twists onto two wires to join them). This is a job for an electrician if you have never done it before.
Can I replace an outlet while the breaker is on if I am very careful?
No. There is no "very careful" that makes this safe. Even experienced electricians turn off the breaker and test with a voltage tester. Electricity moves too fast to react to, and one slip can cause a serious shock or burn. Always turn off the breaker first.
Do I need to buy a special outlet, or will any outlet work?
The outlet must match the amp rating of the circuit. Most homes have 15-amp circuits, so a 15-amp outlet is correct. If you are replacing a 20-amp outlet, buy a 20-amp outlet. The amp rating is stamped on the outlet face. If you buy the wrong one, it will not fit properly or may not work at all.
What is the difference between a two-prong and three-prong outlet?
A three-prong outlet has a round hole for the ground pin and is safer. If you are replacing a two-prong outlet and the wall box has a ground wire (bare copper or green), you should install a three-prong outlet. If there is no ground wire, a two-prong outlet is what the circuit supports, and you should replace it with another two-prong outlet.
How do I know which breaker controls my outlet if they are not labeled?
Plug a lamp into the outlet, then flip breakers one at a time until the lamp goes out. Mark that breaker with tape and a label so you know it for next time. If you have many unlabeled breakers, this is a good weekend project—label them all by testing each one with a lamp in different rooms.