Do you need a neutral wire for a smart home in Singapore?

Short answer: usually no.

Most HDB flats and condos in Singapore were never wired with a neutral at the switch point. Developers skip it because a normal switch doesn't need one. So when a guide online insists a smart home "must" have a neutral wire, it is usually written for another market.

Two kinds of smart switch.

There are two types. One needs a neutral wire. One doesn't. The non-neutral type pulls its power through the lighting circuit, which is why it works in a typical Singapore home with no rewiring.

The one catch: bulb wattage.

A non-neutral switch needs a small, steady load to run properly. If the light it controls draws less than about 7W, the switch may not get enough power and the light can flicker. The fix is easy: put fittings of 7W or higher on those circuits. This is a performance quirk, not a safety problem. A non-neutral switch will not shock anyone.

When you do need a neutral.

Two cases. A smart LCD panel switch, and a smart dimmer switch. Both need a neutral pulled to the switch point, which means paying an electrician to run it. Quotes vary a lot, from a per-point charge to a few hundred dollars for the lot. Want either of those? Budget for the wiring.

The cheaper way to dim.

Most people ask about neutral wire because they want to dim their lights. You don't need a dimmer switch for that. Fit smart bulbs and dim from the app instead, no neutral required. We cover that here.