What you need to do before you touch anything

Replacing an outlet means removing the old one from the wall box and wiring a new one in its place. The work takes about 15 minutes per outlet once you have the right tools and parts. Before you start, you must turn off power to that outlet at the breaker panel and confirm the power is actually off — guessing wrong can cause serious injury or death.

Go to your breaker panel (usually a gray or metal box on a wall in your basement, garage, or utility room). Look for the breaker that controls the outlet you want to replace. The breaker should be labeled, but if it is not, you can flip breakers one at a time until the outlet stops working. Flip that breaker to the OFF position. Then go back to the outlet and test it with a lamp or phone charger to make sure nothing powers on. If you are not certain the power is off, do not proceed.

If you live in an older home with a fuse box instead of breakers, the same principle applies: find and remove the fuse that controls that outlet, then test to confirm no power reaches it.

Key Takeaways

  • Turn off power at the breaker panel and test the outlet with a working device to confirm power is actually off before you touch any wires.
  • You will need a screwdriver (usually flathead), a voltage tester (under $15), a new outlet rated for the same amperage as the old one, and wire strippers if the wire insulation is damaged.
  • The three wires inside the outlet box are black (hot), white (neutral), and bare copper or green (ground), and they must connect to the correct terminals on the new outlet.
  • After you install the new outlet, restore power at the breaker and test it immediately with a lamp or charger to confirm it works.

Tools and materials you will need

A voltage tester (also called a non-contact tester) is the single most important tool. It costs $10 to $20 and tells you whether power is flowing through a wire or outlet without you having to touch anything. You can find them at any hardware store. Do not skip this step — it is the difference between a safe job and a dangerous one.

You will also need a screwdriver (usually flathead, sometimes Phillips depending on the outlet), a new outlet of the same type and amperage as the one you are replacing, and wire strippers if any of the wire insulation is cracked or missing. Most outlets are 15-amp or 20-amp; check the old outlet or the breaker label to know which one to buy. If you are replacing a three-prong outlet, buy a three-prong outlet. If you are replacing a two-prong, buy a two-prong (though three-prong is more common in newer homes).

How to remove the old outlet

Once power is off and you have confirmed it with a voltage tester, unscrew the cover plate (the plastic or metal faceplate) and set it aside. You will see the outlet itself, held in the wall box by two screws at the top and bottom. Unscrew both of these and gently pull the outlet straight out toward you. Do not yank it — the wires are still attached.

You will see three wires connected to the back or sides of the outlet. The black wire (hot) is usually connected to a brass-colored screw. The white wire (neutral) is usually connected to a silver-colored screw. The bare copper or green wire (ground) is usually connected to a green screw. Loosen each screw and carefully pull the wire free. If the wire is stuck, wiggle it gently side to side — do not pull straight out with force.

Once all three wires are loose, remove the old outlet completely and set it aside. Inspect the wires. If the insulation is cracked, burned, or missing, use wire strippers to remove about half an inch of the damaged outer coating and expose fresh wire underneath. If the wire itself is burned or corroded, the outlet box may have a deeper problem — stop and call a licensed electrician.

How to connect the new outlet

Take the new outlet and look at the back or sides. You will see three screws: one brass (hot), one silver (neutral), and one green (ground). The screws may be on the back (push-in terminals) or on the sides (screw terminals). Side-mounted screws are more common and more reliable.

Take the black wire and loop it clockwise around the brass screw, then tighten the screw firmly. The loop should wrap around the screw in the direction the screw turns when you tighten it — this keeps the wire from slipping out as you turn. Repeat with the white wire on the silver screw and the bare copper or green wire on the green screw. Each wire should be snug but not so tight that you are straining the wire itself.

Once all three wires are connected, carefully push the outlet back into the wall box. The outlet should sit flush against the box — if it does not, loosen the screws slightly and adjust the wires until it does. Screw the outlet to the box using the two screws at top and bottom, then screw the cover plate back on.

Testing your work

Go back to the breaker panel and flip the breaker back to the ON position. Return to the outlet and plug in a lamp, phone charger, or any device you know works. If it powers on, the outlet is working correctly. If nothing happens, turn the breaker back off, remove the cover plate, and check that all three wires are still connected tightly to their screws.

If the outlet still does not work after you have checked the connections, the problem may be upstream in the circuit (a tripped GFCI outlet, a bad breaker, or a break in the wire before it reaches your outlet). At that point, call a licensed electrician — troubleshooting beyond the outlet itself requires specialized knowledge.

When to call an electrician instead

Do not attempt this work if the breaker panel itself is damaged, if you cannot locate or access the breaker that controls the outlet, or if you are not confident turning off power. Do not proceed if the outlet box is cracked, if the wires are burned or corroded, or if you see any signs of fire or melting inside the box.

If you live in a rental, check your lease and contact your landlord before replacing anything — in most places, the landlord is responsible for electrical repairs. If you are uncomfortable working with electricity at any point, stop and call a licensed electrician. The cost of a service call is far less than the cost of an electrical fire or injury.

Frequently Asked Questions

What if the outlet has two holes instead of three?

That is a two-prong outlet, and it has only two wires: black and white. There is no ground wire. Replace it with a new two-prong outlet, connecting black to brass and white to silver. Do not try to add a ground wire yourself — that requires running new wire from the breaker panel.

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

No. Even if you think you are being careful, touching a live wire can cause electrocution. Always turn off power at the breaker and test with a voltage tester before you touch any wires. There is no safe way to do this with power on.

What if the new outlet does not fit in the wall box?

The outlet should fit snugly. If it does not, the wires may not be positioned correctly inside the box, or the box itself may be damaged. Loosen the outlet screws slightly and adjust the wire positions, then try again. If it still does not fit, the box may need to be replaced — call an electrician.

How do I know if my outlet is 15-amp or 20-amp?

Look at the breaker in the panel — it will say 15 or 20 on the switch itself. You can also look at the old outlet; 20-amp outlets have a horizontal slot on one side, while 15-amp outlets have two vertical slots. Buy the same type as the one you removed.