Upgrading an existing home to a smart home — where to start without a renovation

Most smart home advice assumes a new flat or a renovation. Most people, though, already live in the home they want to upgrade. The good news is that a lot can be done without opening a single wall, and the best way to start is small.

Start with a problem, not a product

Pick the one thing that annoys you most: lights you walk back to switch off, an aircon you forget to turn off, curtains that let in the afternoon sun, or a door you worry about. That problem decides what to do first. A smart home built from one real annoyance gets used. One built from a shopping list often does not.

What can be done without opening walls

• Retrofit switch modules that sit behind the existing wall switch.
• No-neutral smart switches for switch boxes without a neutral wire. They have trade-offs. See our guide to smart switches without a neutral.
• Battery sensors for doors, windows, motion, temperature and leaks.
• Infrared controllers for split aircon, with a sensor to check the real room. See smart aircon control.
• Clip-on curtain robots that push a curtain along an existing rail.
• A retrofit door lock that fits over the inside of the lock you already have. See our smart door lock guide.

What usually needs more work

• Replacing a wall switch, which is fixed-wiring work and in Singapore should be carried out by a licensed electrical worker.
• Network cable to places where Wi-Fi does not reach.
• Motorised curtain tracks and wired motors, which need power near the window.
• Replacing a door lock entirely.

None of this is wrong to do. It simply costs more effort than the first list, so it usually comes second.

Roll it out in stages

1. One area first. Often the living room, or the lights and aircon you use every day.
2. Live with it for a few weeks. See what the household actually uses.
3. Add sensors and automations once the basics feel reliable.
4. Extend to other rooms with what you have learned.

Keep the old way working

Whatever you add, the wall switches and the key should keep working. Family members who never install an app should not be left in the dark, and a failed gadget should never lock you out. A local system also keeps running when the internet is down. See what still works without internet.

Common questions

Do I need to renovate to get a smart home?

No. Retrofit switch modules, no-neutral switches, battery sensors and infrared controllers work with existing wiring. Planning it into a renovation is cheaper and cleaner, but it is not a prerequisite.

Can I do it in stages?

Yes, and it is usually the best way. Start with one area, see what the household uses, then extend.

What if I only rent?

Much of the first list works without alterations, and you can take it with you. See smart home when you rent.

A simple way to start

Write down the one thing you would change first and where it happens in the home. That is enough to decide the first step.

Living in an older home and wondering what is possible? Tell us what you have and what you want and we will suggest where to begin. You can also read about upgrading an HDB resale flat.