How Wi-Fi extenders, powerline adapters and mesh systems work, the pros and cons of each, which suits which home, and how to set them up for the best results.
If Wi-Fi is strong near your router but weak in some rooms, you have three main options: a Wi-Fi extender, powerline adapters or a mesh Wi-Fi system. Each works differently and suits different homes and budgets. Before buying anything, try the free fixes first: moving the router to a central, open position often solves the problem.
Wi-Fi extenders (repeaters)
An extender plugs in between your router and the weak spot, picks up the Wi-Fi signal and rebroadcasts it.
- Pros: cheap and easy to set up.
- Cons: the extender must be placed where the signal is still reasonable, or it simply repeats a weak signal. Many extenders reduce speed because they use the same radio to receive and transmit. Some create a separate network name, so devices don't switch smoothly.
- Best for: one problem room in a small to medium home, on a tight budget.
Powerline adapters
Powerline adapters send your internet connection through your home's electrical wiring. One adapter plugs in near the router and connects to it by cable; another plugs in elsewhere and provides a wired port, Wi-Fi, or both.
- Pros: can get a connection through thick walls or to a garden office or loft conversion, where Wi-Fi struggles. A wired port is great for a TV, console or desktop.
- Cons: performance depends on your wiring and can vary between sockets. Usually works best plugged directly into a wall socket, not an extension lead. Adapters generally need to be on the same electrical circuit for best results.
- Best for: older homes with thick walls, or reaching one distant room or outbuilding on the same supply.
Mesh Wi-Fi systems
A mesh system uses two or more units placed around the home that work together as one network with a single name. Your devices move between units automatically as you walk around.
- Pros: the most smooth coverage across larger or multi-storey homes. Many systems use a dedicated connection between units (a "backhaul"), maintaining speed. Usually managed with a simple app.
- Cons: the most expensive option. You may need to put your provider's router in "modem" or "bridge" mode, or turn off its Wi-Fi, to avoid two competing networks.
- Best for: larger homes, several floors, or households with many devices.
Some broadband providers offer mesh or Wi-Fi boosters as part of a package or add-on, which can be simpler than buying your own.
How do you choose?
- Map the problem: walk around with a phone running a speed test and note where speed drops.
- One weak room: try an extender or a single powerline kit.
- Thick walls or an outbuilding: powerline, or a mesh unit wired by Ethernet.
- Weak in many places or across floors: mesh.
- Best of all: if you can run an Ethernet cable to a second access point or mesh unit, you get the most reliable performance.
Setting up for the best results
- Place extenders and mesh units about halfway between the router and the dead spot, not in the dead spot itself.
- Keep units off the floor and out of cupboards.
- Update firmware and set strong passwords, as with any router.
- Use the app's signal indicators to fine-tune placement.
- Check the system supports the Wi-Fi standards your devices use, such as Wi-Fi 6 or Wi-Fi 6E.
Frequently asked questions
Will these make my broadband faster?
No. They improve coverage inside your home. If your broadband line is slow at the router, contact your provider.
Can I mix powerline and mesh?
Some mesh systems allow units to connect by Ethernet, and a powerline link can provide that cable connection.
Sources and further reading
Facts checked on 20 October 2026. Spotted an error? Tell us and we will correct it.