A plug outlet can be replaced in about 30 minutes if the power is off
Replacing a standard plug outlet (also called a receptacle) is one of the most straightforward electrical repairs a homeowner can do. The job involves turning off power at the breaker, removing the old outlet, and wiring a new one in its place. You do not need special tools — a screwdriver and a voltage tester are enough. The work is safe as long as you confirm the power is actually off before you touch anything inside the box.
The reason to replace an outlet is usually wear: the slots loosen over time, plugs fall out, or the outlet stops holding a charge. Occasionally an outlet stops working because the circuit breaker has tripped, which you should check first. If the outlet is damaged, cracked, or scorched, replacement is the right move. If it works fine but you want USB ports or a different style, that is also a valid reason to swap it out.
Key Takeaways
- Turn off power at the breaker panel and use a voltage tester to confirm the outlet is dead before you start work.
- Remove the cover plate, unscrew the outlet from the box, and disconnect the three wires — black (hot), white (neutral), and bare copper or green (ground).
- Connect the wires to the new outlet in the same order: black to the brass screw, white to the silver screw, and ground to the green screw.
- Push the outlet back into the box, screw it in, and attach the cover plate before turning the breaker back on.
What you need before you start
Gather a flathead or Phillips screwdriver (depending on your outlet and breaker), a voltage tester (also called a non-contact tester or multimeter), and a replacement outlet. A standard 15-amp outlet costs $1 to $3. If you want a 20-amp outlet, USB outlet, or GFCI outlet, the cost ranges from $5 to $25 depending on the type. Buy the same amperage as the old outlet — the breaker panel will tell you whether the circuit is 15 or 20 amps.
Do not work on a live circuit. A voltage tester is the only way to be certain the power is off. Non-contact testers (the pen-shaped ones) cost $10 to $20 and work by detecting electrical fields — you do not have to touch anything. They are worth buying for any future electrical work in your home.
Turn off power and confirm it is actually off
Go to your breaker panel and find the breaker that controls the outlet you are replacing. The panel should be labeled, but if it is not, you can flip breakers one at a time until the outlet stops working. Flip the breaker all the way to the off position — it should move past center and click into place on the other side.
Go back to the outlet and use your voltage tester. Touch the tester to both slots in the outlet (or use a multimeter set to AC voltage). If the tester beeps or lights up, power is still on — go back and flip the correct breaker. If it does not react, the outlet is dead and you can proceed. This step is not optional. Electrical shock from a 120-volt outlet can stop your heart.
Remove the cover plate and unscrew the outlet
Unscrew the cover plate and set it aside. You will see the outlet itself — a rectangular device with two or three slots. It is held in the electrical box by two screws, one at the top and one at the bottom. Unscrew both of these and gently pull the outlet out of the box. Do not yank on it; the wires are still attached.
The outlet will slide out far enough for you to see the three wires connected to the back or sides. The wires are held in place by small screws. You may see them on the sides of the outlet (side-wired) or on the back (back-wired). Side-wired outlets are more common and easier to work with. If the wires are pushed into holes in the back, you may need a small flathead screwdriver to release them — there is usually a slot next to each hole.
Disconnect the old wires and connect the new outlet
Loosen the three screws holding the wires and pull each wire free. You will see three wires: a black wire (hot), a white wire (neutral), and a bare copper or green wire (ground). Note which screw each wire was attached to — the black wire goes to the brass screw, the white wire goes to the silver screw, and the ground wire goes to the green screw. This order is the same on every outlet.
Take the new outlet and attach the wires in the same order. Loosen the brass screw on the new outlet, insert the black wire about half an inch into the hole, and tighten the screw. Repeat with the white wire and silver screw, then the ground wire and green screw. Pull gently on each wire to make sure it does not slip out. The wires should be snug but not kinked or twisted.
Push the outlet back in and secure it
Carefully push the outlet back into the electrical box. The outlet should slide in smoothly — if it does not, check that the wires are not bunched up or caught. Once it is flush with the box, screw the top and bottom screws back in. Do not overtighten; the outlet should be held firmly but the screws should not strip.
Attach the cover plate and screw it in. Go back to the breaker panel and flip the breaker back to the on position. Test the outlet with a lamp or phone charger to make sure it works. If nothing happens, turn the breaker off again and check that all three wires are connected tightly.
When to call an electrician instead
If the outlet is in a wet location (bathroom, kitchen, outdoor), it should be a GFCI outlet, which has a test and reset button. These work the same way to install, but they cost more and are required by code in those spaces. If you are unsure whether your outlet should be GFCI, ask an electrician or check your local building code.
If the outlet is damaged, the wires are damaged, or the electrical box itself is cracked or loose, stop and call an electrician. If you smell burning or see scorch marks inside the box, do not touch it — turn off the breaker and call for help. If the outlet is in a wall that might contain asbestos (homes built before 1980), have it tested before you open the wall.
Frequently Asked Questions
What is the difference between a 15-amp and 20-amp outlet?
A 20-amp outlet has a horizontal slot on one side (the neutral slot is shaped differently). A 15-amp outlet has two vertical slots of the same size. Buy the same amperage as the breaker that controls the circuit — the breaker panel will tell you. Using a 20-amp outlet on a 15-amp circuit is wasteful but safe; using a 15-amp outlet on a 20-amp circuit can be a fire hazard.
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 serious injury or death. Always turn off the breaker and use a voltage tester to confirm the power is off. There is no shortcut that makes this safe.
Why does my new outlet not work even though I connected the wires?
Check that the breaker is back on and flipped all the way to the on position. If it is on, turn it off again and verify that all three wires are connected tightly to their screws. If a wire is loose, it will not conduct power. If everything is tight and the outlet still does not work, the new outlet may be defective — try a different one.
Do I need a permit to replace an outlet?
Most jurisdictions do not require a permit for replacing an existing outlet with the same type. However, some areas require a permit for any electrical work, and some require one if you are adding a new circuit or changing the outlet type. Check with your local building department or code office before you start.
What should I do if I see aluminum wiring instead of copper?
Aluminum wiring is found in some homes built in the 1960s and 1970s. It requires special handling and special outlets rated for aluminum. If you see aluminum wiring, stop and call an electrician who has experience with it. Do not use a standard copper outlet on aluminum wiring.