COVERAGE

Wi-Fi through thick walls: what to check before buying mesh

Desk research · Published 2026-10-16 · Updated 2026-10-17 · No hands-on product testing

The upstairs room is slow, but the living room is fine. That is a different problem from a poor connection everywhere. Start by comparing the two, rather than guessing which box to buy.

Make the comparison fair

Use one device for both readings. Pause large downloads, stand beside the router, and run a download-speed check. Repeat in the room where things go wrong. Record the time and repeat at least once. A phone and a laptop can give different results in the same place, so comparing different devices adds uncertainty.

If practical, connect the same computer to the router by Ethernet as a separate baseline. A weak room reading tells you something about that route; an Ethernet reading helps you distinguish the home wireless path from the wider connection. Neither test alone diagnoses every intermittent problem.

Try the free change first

A router tucked behind a television, inside a cupboard or beside a substantial obstruction is a poor starting point for a coverage experiment. Try a more open position where the existing connections allow it, then measure again. Do not move provider fibre equipment or alter fixed cabling to chase an ideal position.

Mesh still needs a path

A mesh node relays traffic through its connection to the rest of the network. Placing it in a spot where the upstream signal is already weak can preserve the same bottleneck. Try an intermediate position and retest in the actual problem room.

If an Ethernet route is possible, wired backhaul means the nodes can exchange data through that cable. It can be worth comparing this with an ordinary wired access point. For one stationary TV or work computer, a direct cable may solve the immediate problem without adding room-wide Wi-Fi.

What a box cannot promise

A coverage area on a retail listing is not a survey of your walls. Do not interpret a Wi-Fi standard or theoretical radio rate as the speed you will get upstairs. Before buying, confirm the pack contents, operating mode, current security support, return terms and whether any advertised features require a subscription.

Next action: make two comparable readings and one placement change. Use the home Wi-Fi check to turn those observations into an action list.