Disclaimer

Smart switches and outlets are one of the most accessible ways to bring home automation into an existing house, letting you control lighting, fans, and plugged-in devices from an app, voice assistant, or schedule. Unlike smart bulbs, smart switches control the actual wiring, so the upgrade sticks even if you swap out light fixtures later.

Check for a Neutral Wire

Most smart switches require a neutral wire in the switch box to power their Wi-Fi or Bluetooth connection continuously. Many older homes wired switches without a neutral present at the switch box. Before buying a smart switch, check your box for a bundled white wire — if there isn’t one, look for a “no-neutral” smart switch model or plan to have an electrician run a neutral wire.

Turn Off Power and Confirm It’s Off

As with any switch or outlet project, cut power at the breaker panel first and confirm with a voltage tester before disconnecting any wires.

Map Your Existing Wiring

Take a photo of the existing switch wiring before removing anything. Smart switches typically require you to identify the line (incoming power), load (wire to the fixture), neutral, and ground wires — labeled terminals on the smart switch make this easier, but the existing wire colors don’t always match standard conventions in older homes.

Connect and Configure

Once wired according to the manufacturer’s diagram, secure the switch in the box, restore power, and follow the manufacturer’s app to connect the switch to your home Wi-Fi network. From there, most apps let you set schedules, group devices into scenes, and link the switch to a voice assistant.

Smart Outlets vs. Smart Plugs

If you’d rather not rewire a switch, a smart plug that sits between the outlet and a device offers similar functionality without touching your home’s wiring, though it only controls whatever is plugged into it rather than a fixture wired to the wall.

When to Bring in an Electrician

If you don’t have a neutral wire, if your switch box is unusually crowded, or if you’re installing multiple smart switches at once, an electrician can save you time and ensure everything is code-compliant.