Smart switch needs a neutral wire — what now?

Most smart switches require a neutral wire, but if your home doesn't have one in the switch box, you have several options to make smart switches work.

Older homes in New Brunswick, particularly those built before the 1980s, often lack neutral wires at switch locations. Traditional switches only needed the hot (black) and switched hot wires to control lights, but smart switches need the neutral (white) wire to power their internal electronics and maintain WiFi connectivity even when the light is off.

Your main options include installing smart switches that don't need neutrals, running new wire, or using smart bulbs instead. No-neutral smart switches like Lutron Caseta, some GE models, and certain TP-Link Kasa switches work by using the ground wire and a small amount of current through the light fixture to power themselves. These work well with LED and incandescent bulbs but may have compatibility issues with some dimmable LEDs or very low-wattage fixtures.

Running new 14-3 wire (which includes a neutral) is the permanent solution but requires opening walls and typically costs $300-600 per switch location in New Brunswick, depending on accessibility. This work requires a TSANB permit since you're adding new circuits or modifying existing ones. A licensed electrician would run the new wire from your panel to each switch box, giving you full smart switch compatibility.

Smart bulbs offer an easier alternative - replace regular bulbs with smart LED bulbs and keep your existing "dumb" switches. This works well for lamps and simple lighting but doesn't give you the clean wall-mounted smart switch experience. Smart bulbs cost $15-40 each but require no rewiring.

For New Brunswick homes, the neutral wire issue is especially common in older areas of Moncton, Saint John, and Fredericton where many homes still have original 1960s-70s wiring. If you're planning other electrical work like a panel upgrade or adding circuits, that's an ideal time to run neutral wires to switch locations.

Safety note: Never attempt to run new electrical wire yourself - this requires working in walls near live circuits and must be done by a licensed electrician to meet TSANB requirements and maintain your home insurance coverage.

Need help finding an electrician to assess your smart switch options? New Brunswick Electrical can match you with local professionals who specialize in smart home installations and can determine the best approach for your specific situation.