Turn off power at the breaker before you touch anything

The first step is always the same: kill the power. Go to your electrical panel and flip the breaker that controls the bathroom light. If you are not sure which one it is, turn on the light, then flip breakers one at a time until the light goes off. Leave that breaker in the off position and tape it shut or put a note on it so nobody turns it back on while you are working.

Once the breaker is off, test the light switch to confirm the power is really gone. Flip it a few times—nothing should happen. This is the only safety step you cannot skip. Electricity in a light fixture can kill you, even if you think you know what you are doing.

Key Takeaways

  • Always turn off power at the breaker and test the switch before touching any wires or metal parts inside the fixture.
  • Most bathroom fixtures are held in place by a center nut or a pair of mounting brackets—remove these and the old fixture will come down.
  • The wires inside connect with wire nuts (plastic caps that twist on)—match the wire colors when you connect the new fixture, or hire an electrician if you are unsure.
  • Bathroom fixtures must be rated for damp locations; check the label on the new fixture before you buy it.
  • If you see aluminum wiring or more than three wires in the junction box, call a licensed electrician instead of doing this yourself.

Remove the old fixture from the ceiling or wall

Once the power is off, look at how the fixture is mounted. Most bathroom lights are held up by either a center nut (a large metal nut in the middle of the fixture) or by two mounting brackets bolted to the electrical box in the wall or ceiling. Use a wrench or socket to unscrew the center nut, or use a screwdriver to remove the bracket bolts. The fixture will come down—have someone hold it or support it with one hand while you work.

As the fixture comes down, you will see wires inside. Do not pull hard on these wires; they are fragile and pulling them can damage the connections inside the wall. Lower the fixture gently and set it on a stable surface where you can work on it without dropping it.

Disconnect the old wires and remove the fixture completely

Inside the fixture, you will see three or four wires twisted together with plastic caps called wire nuts. These caps hold the wires in place. Unscrew each wire nut by turning it counterclockwise—it will come off in your hand. Once all the nuts are off, gently untwist the wires and separate them.

You will see three wires: a black wire (hot), a white wire (neutral), and a bare copper or green wire (ground). Some fixtures also have a fourth wire that is part of the mounting bracket. Once all wires are separated, the old fixture is free. Set it aside or take it to a recycling center if it is broken.

Prepare the electrical box for the new fixture

Look inside the hole in the ceiling or wall where the old fixture was. You will see an electrical box—a metal or plastic container that holds the wires. This box should be clean and dry. If there is dust, use a dry cloth to wipe it out. If there is water damage or corrosion, stop and call an electrician; moisture in the electrical box is a fire hazard.

Check the label on the electrical box. It should say it is rated for the weight of your new fixture. Most bathroom lights weigh between 2 and 5 pounds, so standard boxes work fine. If your new fixture is unusually heavy (more than 10 pounds), you may need a reinforced box, and an electrician can install one.

Install the mounting bracket and connect the wires

Your new fixture will come with a mounting bracket. This bracket screws to the electrical box and holds the fixture in place. Follow the instructions that came with the fixture—they vary by brand. Usually you will screw the bracket to the box with two bolts, then hang the fixture from the bracket.

Now connect the wires. Match the colors: black to black, white to white, copper to copper. Hold the two wires side by side, twist them together clockwise three or four times, then screw a wire nut onto the twisted wires. Twist the nut clockwise until it is tight and the wires do not move when you tug on them gently. Repeat for all three wire pairs. Once all wires are connected, gently push them back into the electrical box so they are not pinched when you push the fixture up.

find the fixture and install the bulbs

Push the fixture up toward the ceiling or wall and align it with the mounting bracket. Depending on your fixture, you will either screw a center nut onto a threaded rod, or bolt the fixture to the bracket with two bolts. Tighten these fasteners firmly but do not over-tighten—you want the fixture snug against the wall or ceiling with no gaps, but you do not want to crack the fixture or strip the threads.

Once the fixture is find, install the light bulbs. Check the fixture label to see what wattage and type of bulb it needs—most bathroom fixtures use standard screw-in bulbs, but some use pin-base bulbs or require specific LED types. Screw the bulbs in by hand until they are snug, then turn the breaker back on and test the light. If it does not work, turn the breaker off again and check that all wire nuts are tight and all wires are fully inserted into the electrical box.

Install the trim ring and cover plate

Most fixtures have a trim ring or escutcheon—a decorative ring that covers the gap between the fixture and the ceiling or wall. Slide this ring up against the ceiling or wall and tighten the set screw or bolt that holds it in place. If your fixture has a glass shade or diffuser, install it now by following the instructions that came with the fixture.

If the fixture is recessed into the ceiling, you may also need to install a cover plate or trim ring inside the fixture opening. Again, follow the instructions for your specific model. Once everything is in place, turn the breaker back on, flip the light switch, and confirm the light works.

When to call an electrician instead

Do not do this job yourself if you see aluminum wiring (it looks silver and is softer than copper), if there are more than four wires in the electrical box, or if the wires are damaged or discolored. Also stop if the electrical box is loose, cracked, or shows signs of water damage. These are signs of a problem that needs a licensed electrician.

If you are not confident about matching wire colors, or if the fixture does not come with clear instructions, call an electrician. A bathroom light fixture costs $50 to $300, but an electrician visit costs $100 to $200—it is worth paying for safety and peace of mind. Most electricians can replace a fixture in 30 minutes to an hour.

Frequently Asked Questions

Do I need a special bulb for a bathroom light?

Bathroom fixtures do not require special bulbs, but they do need to be rated for damp locations if the fixture is close to the shower or tub. Check the fixture label—it will say "damp location" or "wet location" if needed. Most standard LED and incandescent bulbs work in damp-rated fixtures; the rating is about the fixture itself, not the bulb.

What if the wires in my fixture are different colors than I expected?

Older homes sometimes have wiring that does not match modern color codes. If you see wires that are not black, white, or copper, or if you are unsure which wire is which, stop and call an electrician. Guessing at wire connections can cause a fire or electrocution.

Can I replace a recessed light with a surface-mounted fixture?

Yes, but you will need to patch the hole in the ceiling. If the hole is small (less than 6 inches), you can use a drywall patch kit from any hardware store. If it is larger, you may want to hire a drywall contractor. The electrical work is the same—the new fixture mounts to the existing electrical box.

How do I know if my electrical box can support the new fixture?

Look at the label stamped or printed on the box itself. It will say the maximum weight it can hold, usually 50 pounds or more. Most bathroom lights weigh 2 to 5 pounds, so standard boxes are fine. If your fixture is very heavy or the box is damaged, an electrician can install a reinforced box.

What should I do with the old fixture?

If it still works, you can donate it or sell it online. If it is broken, take it to an electronics recycling center—most accept old light fixtures for free. Do not throw it in the trash; fixtures contain materials that should be recycled.