How to Replace a Light Switch

Swap a worn or broken switch safely.

Replacing a standard light switch is one of the simplest electrical jobs, but it still demands the cardinal safety rule: cut the power and confirm it's off before touching the wires.

Power off and verify

Turn off the breaker for that switch and confirm the wires are dead with a non-contact voltage tester — the wall switch alone isn't enough. Remove the cover plate and unscrew the switch from the box.

Note the wiring

A standard single-pole switch has two terminals plus a ground. Photograph the connections first. Transfer the two wires to the new switch's brass screws (orientation doesn't matter on a single-pole), and connect the ground to the green screw.

If it looks different

If there are three or four wires plus travelers, it's a three-way or smart switch and wires differently — label the common before disconnecting. Aluminum wiring, scorched wires, or a switch you can't identify are reasons to call an electrician.

Frequently asked questions

Can I replace a light switch myself?

Yes, a single-pole switch is a simple swap — just shut off the breaker, verify the wires are dead, and match the connections. Call a pro for three-way, smart, or aluminum wiring.

Does it matter which wire goes where on a light switch?

On a standard single-pole switch, the two hot wires can go on either brass screw. The ground goes to the green screw. Three-way switches require keeping the common wire correct.