Wi-Fi for a smart home — do you need mesh, and where should the router go?

Most smart home complaints that sound like "the device is bad" are really "the Wi-Fi does not reach there". A flat full of smart devices asks different things of a network than a few phones and laptops do, so it is worth planning rather than hoping the single router by the front door will cope.

How smart devices differ from phones

• Many small devices. Each one holds a connection open all day. A cheap router can struggle with the number of devices long before it runs out of speed.
• Often 2.4 GHz only. Many plugs, bulbs and sensors do not support 5 GHz. 2.4 GHz travels further through walls but is more crowded, especially in apartment blocks with many neighbouring networks.
• Placed in awkward spots. Behind a TV, inside a cabinet, at the far end of a balcony, next to a metal door. These are exactly the places Wi-Fi reaches worst.

Walls and layout matter

Concrete and brick walls, metal doors and lift cores weaken signal much more than drywall does. One router near the entrance can leave the bedrooms or the balcony with a weak connection. Rather than guessing, walk around with a phone and see how the signal holds in each room, especially at the spot where a device will actually sit.

Do you need mesh?

Not necessarily. The options, roughly from simplest to most robust:

1. A single good router, well placed. Central in the home and out in the open, not in a storage cupboard. This is enough for some smaller units.
2. Mesh nodes connected wirelessly. Easy to add, but each wireless hop costs some performance, so place nodes where they still get a decent signal from the previous one.
3. Access points connected by network cable. Usually the most dependable arrangement, because each access point has its own wired link back to the router. It needs cabling, which is much easier to arrange during renovation than afterwards.

Reduce the load on Wi-Fi altogether

Not every device needs to join your Wi-Fi. Battery-powered sensors, switches and buttons using Zigbee or Thread connect to a hub instead, and only the hub needs a network connection. That keeps your router for the devices that genuinely need it, such as cameras and streaming boxes. Wired Ethernet is also worth it for the hub, the TV and anything fixed in place.

Small settings that help

• Give the hub and key devices fixed addresses (a DHCP reservation in the router), so they do not change after a restart.
• Pick a clear channel if you have a choice, and keep the router firmware up to date.
• Consider a separate network for smart devices, so a cheap gadget is not sharing a network with your laptop. Check that your hub can still reach the devices before you rely on it.
• Note your Wi-Fi name and password somewhere safe. Replacing a router later means re-pairing devices that were tied to the old settings.

Common questions

Do I need a mesh system for a smart home?

Not necessarily. A single good router, well placed, is enough for some smaller units. Mesh nodes are easy to add but each wireless hop costs some performance, and access points connected by network cable are usually the most dependable.

Do all smart devices need Wi-Fi?

No. Battery-powered sensors, switches and buttons using Zigbee or Thread connect to a hub, and only the hub needs a network connection. That keeps your router for devices that genuinely need it, such as cameras and streaming boxes.

What should I prepare during renovation?

Ask for network cable runs to where you may want an access point, the TV and the hub, even if you will not use them on day one. Any fixed electrical work should be carried out by a licensed electrical worker. See how we plan BTO flats.

Plan it before the renovation

If you are renovating, ask for network cable runs to the places where you may want an access point, the TV and the hub, even if you will not use them on day one. Cable inside a wall is cheap to add while the walls are open and awkward to add afterwards. Any fixed electrical work should be carried out by a licensed electrical worker.

Not sure how well your home will be covered? Tell us about your home and we will suggest where the network needs help.