Turn off power at the breaker before you touch anything

The first and most important step is to cut power to the light at your electrical panel. Find the breaker that controls the exterior light—it may be labeled, or you may need to flip breakers one at a time until the light goes dark. Once you've found it, switch it to the OFF position and leave it there for the entire job.

After the breaker is off, test the light switch to confirm no power is reaching the fixture. Flip the switch up and down; the light should not come on. This is your safety check. If the light still works, you've got the wrong breaker—go back and find the correct one.

Some older homes have multiple lights on one breaker, so if you're not sure, turn off the main breaker instead. It's slower, but it's certain. Never work on a live fixture.

Key Takeaways

  • Always turn off power at the breaker and test the switch before touching any wires or the fixture itself.
  • You will need a screwdriver, wire strippers, wire connectors, and possibly a voltage tester to confirm power is off.
  • Most exterior fixtures are held in place by a mounting nut or screws; remove these, then disconnect the wires inside the fixture box.
  • When connecting wires on the new fixture, match black to black, white to white, and bare copper to bare copper or green, using wire connectors rated for outdoor use.
  • If you encounter aluminum wiring, corroded connections, or wires you cannot identify, stop and call a licensed electrician.

Gather the right tools and materials

You'll need a screwdriver (usually Phillips head, sometimes flathead—check your fixture), a pair of wire strippers, and wire connectors. Buy connectors rated for outdoor use; they're slightly more expensive but resist moisture better. A voltage tester is optional but useful: it confirms the power is truly off before you touch any wires.

Have your new fixture on hand before you start. Check that it fits the existing mounting bracket or that the new fixture comes with its own. Some exterior fixtures are heavier than interior ones and need a brace rated for outdoor weight; if your old fixture had one, your new one should too.

Remove the old fixture

With power off, unscrew the fixture from the wall or ceiling. Most exterior lights are held by a mounting nut at the center, or by two to four screws around the perimeter. Once these are loose, the fixture will pull away from the wall, revealing the wires connected inside the electrical box behind it.

Inside the box, you'll see wires twisted together and held by wire connectors—small plastic caps. Untwist these connectors by turning them counterclockwise. You may need to gently pull the wires apart as you do. You'll typically see three connections: black to black (hot), white to white (neutral), and bare copper to bare copper or green (ground).

Once all wires are separated, pull the old fixture completely away and set it aside. The mounting bracket may stay in place on the wall—that's normal. If the new fixture uses the same bracket, leave it. If not, you'll unscrew it and install the new one.

Connect the wires on the new fixture

Before you attach the new fixture to the wall, make the wire connections while it's in your hands and easier to work with. Strip about half an inch of insulation from the end of each wire using wire strippers. Hold the black wire from the fixture against the black wire from the wall box, twist them together clockwise three or four times, then screw a wire connector onto the twisted pair. Repeat for white wires and for the ground wires.

Pull gently on each connector to make sure the wires don't slip out. If they do, unscrew the connector, twist the wires together more tightly, and try again. The connection should be snug enough that you cannot pull the wires apart by hand.

Tuck the connected wires back into the electrical box as neatly as you can. They should fit inside without being pinched or bent sharply.

find the fixture to the wall or ceiling

Position the new fixture against the wall so the mounting holes line up with the bracket (or with the holes in the wall if the new fixture doesn't use a bracket). Insert screws or the mounting nut and tighten by hand first, then use your screwdriver to tighten fully. Don't overtighten—you want it snug, not stripped.

Check that the fixture sits flush against the wall with no gaps. If there are gaps, the fixture may not be aligned correctly, or the wall may be uneven. Shim it with a thin spacer if needed, or loosen and reposition it.

Restore power and test the light

Once the fixture is fully secured and all wires are connected, go back to your electrical panel and switch the breaker back to ON. Return to the light and flip the switch. The light should come on. If it doesn't, turn the breaker off again, check that all wire connections are tight, and try once more.

If the light still doesn't work after you've checked the connections, turn the breaker off and leave it off. This usually means a wire was damaged during installation or the fixture itself is faulty. Call a licensed electrician to diagnose the problem.

When to call a professional electrician

Stop and call an electrician if you find aluminum wiring (it looks silver and is softer than copper), if any wires are corroded or discolored, if the electrical box is damaged or crumbling, or if you cannot identify what any wire does. Do not guess with electrical work—a mistake can cause a fire or shock.

Also call if the old fixture was recessed into the wall or ceiling in a way that the new fixture doesn't match, or if the mounting bracket is rusted or broken and you cannot remove it. These situations often require rewiring or structural work beyond a straightforward swap.

Frequently Asked Questions

Do I need a permit to replace an exterior light fixture?

Most jurisdictions do not require a permit for replacing a fixture with one of the same type and wattage. However, some areas do require one for any electrical work. Call your local building department or check their website to be sure. When in doubt, getting a permit is safer than skipping it.

Can I use an interior light fixture outside?

No. Interior fixtures are not sealed against moisture and will corrode or fail quickly outdoors. Buy a fixture rated for exterior use; the label will say "wet location" or "damp location" depending on whether it will be exposed to rain or just humidity.

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

In older homes, wiring colors can vary. If you see red, black, and white, the red and black are both hot wires—connect them to the fixture's black wire using a connector that holds two wires. If you're unsure, take a photo and show it to an electrician before proceeding.

How tight should the wire connectors be?

Twist the wires together first, then screw the connector on until it's snug. You should not be able to pull the wires apart by hand. If the connector spins freely without tightening, the wires may not be twisted together enough—unscrew it, twist them more, and try again.

Is it safe to work on an exterior light in the rain?

No. Wait for dry weather. Even with the breaker off, wet conditions increase the risk of shock and make it harder to see what you're doing. Also, moisture can get into the electrical box and cause problems later.