Renovation guides

How to replace a ceiling light fixture

Draft guide written from standard practice, not yet reviewed by a licensed pro. Follow product labels where they differ.

Switch the breaker off and prove every wire dead with two testers, look in the box before you touch a wire and stop at any warning sign, take the old fixture down, mount the new bracket and connect the ground, wire it the way it was, hang the fixture, then test at the switch.

Difficulty 3 of 5 · about half a day · careful

Photo of your room, the look you pick, then this guide with the materials counted for your room.

Step by step

1. Step 1 of 9

   Read the stop-gate before you buy anything

   

   This job takes down a ceiling fixture and puts up a new one in the same place, on the same box, on the same wires, worked by the same switch. A new place, a new box, a new switch or dimmer, or a ceiling fan is a licensed electrician's job or its own guide. You will look into the box before you touch a single wire (step 4): what you find there decides whether you go on.

2. Step 2 of 9

   Buy a fixture that fits the box and the room

   

   Read the new fixture's box: its weight, the mounting it comes with, and its location rating — in a bathroom, a fixture over or near the tub or the shower must be rated for that spot. Check that its canopy covers the old fixture's outline on the ceiling. A heavy fixture or a chandelier needs a box and support marked for that weight; if you do not know what your box carries, ask an electrician before you buy.

   Is this a like-for-like swap?

   • The new fixture goes in the same place as the old one, on the existing box — the old one hangs on a box too, not a recessed can or a track
   • It is worked by the same wall switch — no switch, dimmer, or smart switch is added or rewired
   • No new circuit, no new box, and no new cable is needed
   • The new fixture is a light, not a ceiling fan
   • In a bathroom: the fixture's label rates it for its spot — or this is not a bathroom

3. Step 3 of 9

   Breaker off, then prove every wire dead

   

   Turn the light on, find the breaker that turns it off, switch it off, and tape it so nobody flips it back. Turn the wall switch off too. Set up your own light that is not on this circuit. Check the non-contact tester on a live outlet. Take off the globe and the bulbs, loosen the canopy, and hold the fixture by its body, never by the wires. Test every wire in the box with the non-contact tester, then each pair and each wire to ground with the two-lead tester. Check the tester on the live outlet again. Any wire that still reads live: stop, put the canopy back, and call an electrician.

   Power off and proven

   • The breaker is off and taped, and the wall switch is off
   • The non-contact tester worked on a live outlet before and after the test
   • Every wire in the box tested dead with the non-contact tester
   • Every pair, and every wire to ground, tested dead with the two-lead tester
   • A steady ladder, safety glasses, and your own light that is not on this circuit

4. Step 4 of 9

   Look in the box before you touch a wire

   

   Photograph the connections before you undo anything. Then look, without touching: aluminum wire, knob-and-tube, cloth or crumbling insulation, no ground wire, scorch marks or melted plastic, a loose or cracked box, a box crammed with more wires than you can explain, or a heavy fixture going on a box that is not marked for its weight. Any one of these is a hard stop: do not undo a single connector, put the old fixture back up the way it was, and call a licensed electrician.

   Before you touch the wires

   • A photo of the connections is on your phone
   • The wires are copper with sound insulation — no aluminum, no knob-and-tube, no cloth or crumbling insulation
   • There is a ground wire in the box
   • No scorch marks, melted plastic, or burnt smell
   • The box is tight and not cracked, and it carries the new fixture's weight per the box's marking and the fixture's instructions
   • You can say what every wire in the box does, and they match a simple black, white, and ground hookup

5. Step 5 of 9

   Take the old fixture down

   

   Hold the fixture's weight — a helper on a second ladder for anything heavy. Undo the wire connectors and separate the fixture's wires from the house wires, keeping the house wires apart from each other. Unscrew the old mounting bracket. Push on the box: it must not move.

6. Step 6 of 9

   Mount the new bracket and connect the ground

   

   Screw the bracket that came with the new fixture to the box with the screws its instructions name, so it sits flat and tight. Connect the house ground and the fixture's ground to the bracket's green screw, or join them with a wire connector and a short ground lead to the green screw, the way the instructions show.

7. Step 7 of 9

   Wire it the way it was

   

   Following your photo and the fixture's instructions: the fixture's white to the house white, the fixture's black to the house black, each with a wire connector rated for those wires, twisted tight with no bare copper showing below it. Tug each wire. If the house wires are not one black, one white, and a ground, or they do not match your photo and the instructions, stop — that is an electrician's call. Fold the wires neatly into the box.

8. Step 8 of 9

   Hang the fixture and fit the canopy

   

   Lift the fixture to the bracket and fasten the canopy as the instructions say, with no wire pinched between the canopy and the box. Fit bulbs no stronger than the fixture's label allows, then the globe or the shades.

9. Step 9 of 9

   Breaker on, then test at the switch

   

   Take the tape off and switch the breaker on. Work the wall switch several times: the light comes on and goes off with the switch, every time. Let it run for a while. Flicker, buzzing, a warm canopy, a burnt smell, or a breaker that trips: switch the breaker off and call an electrician.

   Quality check

   • The light turns on and off with its wall switch, every time
   • No flicker, buzzing, burnt smell, or warm canopy after it has run for a while
   • The breaker has not tripped
   • The fixture is tight to the ceiling, with no wire showing and none pinched
   • The bulbs are within the wattage on the fixture's label

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