Safety first: work only with the breaker off and the wires tested dead with a non-contact voltage tester. If you're unsure which breaker it is, or anything looks damaged, stop and call.
Tools & materials
- LED-compatible dimmer (single-pole or 3-way to match)
- Non-contact voltage tester
- Screwdrivers
- Wire strippers
- Wire connectors
Step by step
- Step 1
Turn off the breaker and confirm with a voltage tester that the switch is dead.
- Step 2
Remove the cover and switch, and photograph how it's wired.
- Step 3
Most dimmers have wire leads: connect the two switch wires to the dimmer's black leads, and the ground to the green lead.
- Step 4
Twist on connectors firmly and tug-test each one.
- Step 5
Fold the wires in, mount the dimmer and cover plate, then turn the breaker on.
- Step 6
Test the full dim range. If LEDs flicker, adjust the dimmer's low-end trim setting.
When to stop and call ProFix
If you see any of these, stop and call us:
- The switch box has three or more cables (3-way or 4-way circuits)
- There's no neutral and your smart dimmer needs one
- The box is crowded or too shallow for the dimmer
- You see aluminum or cloth-insulated wiring
Not in the mood to DIY? A ProFix pro can handle it for you in Chicago Metro and Dallas–Fort Worth, with a written price before work starts.
Related guides
These guides are general information for simple repairs. You're responsible for your own safety and for following local codes and your lease or HOA rules. When in doubt, stop and call a licensed professional. All DIY guides