How to Replace a Light Switch

A switch that crackles, feels loose or doesn't turn the light on reliably is a cheap, quick swap, as long as the power is off.

DifficultyEasy

Time20–40 min

DIY cost$3–$15

Pro would charge$100–$200

Safety first

Turn off the breaker for that circuit and confirm with a voltage tester before touching wires.
Never work on the main electrical panel; that's a job for a licensed electrician.

Single-pole switch with the same amp rating (usually 15 A) and color as the old one

Kill the power
Switch off the breaker, flip the switch to confirm the light is off, and test the wires with a non-contact tester.
Remove the old switch
Unscrew the cover plate and mounting screws and gently pull the switch out of the box.
Note the wiring
Take a photo. A single-pole switch has two black (hot) wires on brass screws and a bare or green ground.
Wire the new switch
Move one wire at a time: hook each wire clockwise around the matching screw and tighten. Attach the ground to the green screw.
Mount and test
Fold the wires back, screw the switch to the box, add the cover plate, restore power and test.

Call an electrician if you find aluminum wiring, scorched wires, more wires than expected (3-way or 4-way circuits), or the breaker keeps tripping.

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