Here is a pattern we see every other month. A couple moves into their new flat, falls in love with smart lighting on YouTube, and tries to add a smart switch on a Sunday afternoon. The switch powers up, flickers, then dies. The reason is almost always the same: no neutral wire at the switch box. A proper smart home renovation in Singapore is decided long before you buy a single gadget. It is decided when the walls are open and the electrician is still on site.

Most of the “smart” you want can be added wirelessly later. But a handful of things are painful to retrofit, so they belong in your reno scope from day one. At Reno Bros we sort every smart request into two piles: wire it in now, or add it later. Get that right and you avoid both overspending and regret.

Smart Home Renovation in Singapore: Wire It In Now (Not Later)

The rule of thumb is simple. If it needs a cable inside a wall, a gang box, or a hidden power point, plan it before plastering and painting. Once the walls close and the floor goes down, adding any of this means hacking, patching and repainting, plus a far bigger bill.

• Neutral wires at every switch point. Most older HDB flats and plenty of condos only run live and load to the wall switch. Smart switches need a constant trickle of power for their WiFi or Zigbee radio, which means a third wire. Running neutrals to your switch points during reno usually costs SGD 500 to 1,200 across a flat, and future-proofs you for any brand. No-neutral switches exist, but they are fussier with LED lights and less reliable long term.
• Deeper gang boxes. Swap them while the wall is open. Cheap insurance against chunky smart-switch modules that won’t sit flush.
• Then there’s the network. Decide where the router lives, run one or two LAN points to it, and add one near the TV console plus a low-voltage feed for a wired video doorbell at the gate. Mesh WiFi covers most flats, but a wired backbone to your main hubs stops the whole house lagging when everyone is streaming at 9pm.
• Concealed power at the window head. Motorised curtain tracks need a point at the top of the window. Run it now and the cable disappears; add it after painting and you get trunking down your wall.

All of this is electrical work, which in an HDB flat must be done by a Licensed Electrical Worker (LEW) under your renovation permit. Your contractor coordinates it; you do not DIY it.

Sequence matters more than people realise

Smart wiring is a first-fix job. It goes in alongside your electrical and aircon rough-in, well before carpentry and ceiling close up; miss that window and the neat hidden install becomes a surface-mounted compromise. One thing we do on every site: walk the flat with the homeowner and stand where each switch, point and sensor will go before the electrician chases the walls. People always spot a switch in the wrong place once they picture living there. Catching it then costs nothing.

What a smart main door involves (and the rule people miss)

A digital lock is the single most popular smart upgrade, and it comes with a real regulation. Since 1 March 2024, any digital lock fitted to an HDB main door must keep the door’s fire rating and carry a valid Certificate of Conformity to SS 332 or EN 1634-1, with a mechanical key override. Use a fire-rated model and an installer who knows the rule, because over-drilling a fire door is a real safety and compliance problem.

Condo owners face a different hurdle. Check with your MCST before you buy: many have bylaws on the look of unit entrances, so a chunky exterior keypad may not be allowed. The lock runs on batteries, so the approval, not the wiring, is what holds you up.

What to skip, or at least delay

A lot of “smart home” is just wireless kit you can buy any weekend, so leave it out of your wiring scope. This is where budgets get wasted.

• Smart bulbs, plugs and sensors. All wireless and plug-and-play. Add them later, room by room, once you know how you actually use the space.
• A pricey wall-mounted “smart home control panel.” Tempting in the showroom, but your phone and a voice assistant do the same job for free, and wall panels date fast.
• Whole-home automation packages bought blind. App-controlled lighting, curtains and aircon scenes are genuinely useful, and a basic whole-home setup runs around SGD 2,000 to 4,000. Buy it because you have mapped out scenes you will use, not because it looks impressive on a quote.
• Locking into one expensive proprietary system. Stick to devices that speak common standards (Matter, Zigbee, or a widely supported app). It keeps you free to mix brands and swap parts later.

Frequently Asked Questions

How much should I budget for smart home wiring during my renovation?

Treat it as two separate lines. The wiring groundwork (neutrals, extra points, network cabling, deeper gang boxes) is usually a few hundred to low-four-figure dollars on top of your electrical works, with motorised curtains adding roughly SGD 2,000 to 5,000 for a typical four-window flat including fabric. The devices themselves are a separate spend you can stage over time.

I’m on a tight budget. What’s the one thing worth doing now?

Run neutral wires to your switch points and make sure the gang boxes are deep enough. That single decision keeps every smart-switch option open for years, and it is far cheaper to do with the walls open than to retrofit later. Everything else can wait.

Can I make an older resale flat smart without rewiring the whole place?

Yes, to a point. Wireless devices, battery locks and no-neutral switches let you add a lot without major works. If you are already rewiring in a full resale reno, that is the moment to add neutrals and points properly. If not, lean on the wireless ecosystem and accept that a few switches will need the no-neutral type.

Plan the smart parts with the rest of the reno, not after

The smartest-feeling homes are the ones where the groundwork went in early and the gadgets came later, which is easiest inside a full renovation run by one team. See how we sequence electrical, ceiling and carpentry across our past projects, read what is covered under our renovation services, or reach us through contact. Or message Reno Bros on WhatsApp and tell us which features you want.

Related Reads

• Aircon and electrical planning before the walls close up
• Condo renovation guide: rules, timelines and design wins
• 5 critical steps to a stress-free renovation