Wi-Fi Dead Spots: How to Find and Fix Them
Why some rooms get weak Wi-Fi and how to fix dead spots in a UK home, from router position and channels to mesh, access points and wired options.
Almost every home has a room where Wi-Fi limps along: the back bedroom, the kitchen extension, the garden office. Dead spots are rarely a sign of faulty equipment. They are usually physics: distance, thick walls and interference. The fix starts with finding out exactly where and why the signal drops.
Map the problem first
Walk around with your phone and run a speed test in each room, noting the result next to where the router sits. Our guide on testing broadband speed properly explains how to get meaningful numbers. Sketch a rough floor plan and mark good, patchy and dead areas. Patterns appear quickly: a drop behind a chimney breast, a fade after two internal walls, or a weak signal upstairs.
Common causes in UK homes
- Solid walls. Older brick, stone and brick-and-plaster walls absorb signal. Modern foil-backed plasterboard and insulation can also block it.
- Router in the wrong place. Routers are often stuck where the line enters the house, such as a hallway corner or under the stairs.
- Interference. Microwaves, cordless phones, baby monitors and neighbours' networks all compete.
- Distance and floors. Signal weakens quickly, and floors and ceilings are tough for it to pass through.
- Large metal items, such as mirrors, radiators, fridges and filing cabinets.
- Old equipment. Older devices and routers support slower standards and shorter range.
Fixes, from free to paid
Free and quick
- Move the router to a central, raised, open position away from walls and appliances. See router placement.
- Point or reorient antennas, if yours has them, so one is vertical and one horizontal.
- Restart and update the router's software.
- Switch band. The 2.4GHz band travels further; 5GHz is faster at shorter range. Many devices choose well on their own, but check.
- Change the channel if neighbours crowd the same one.
Low cost
- A plug-in extender can fill a single gap if placed halfway between router and dead spot, not in the dead spot itself.
- Powerline adapters send the network through your electrical wiring. Results vary with the wiring.
More robust
- Mesh system. Several units share one network name and hand devices around. See mesh Wi-Fi versus extenders.
- Wired access points. A cable to each location gives the best consistency, and is ideal for an office in the garden or loft.
What a placement rule of thumb looks like
Put extenders and mesh units where the existing signal is still reasonably strong, not where it has already died. A unit placed in a dead spot only repeats a bad signal.
Check the device, not just the signal
Older laptops, cheap smart plugs and some phones have weak Wi-Fi hardware. If one device struggles while others in the same place are fine, the problem is the device. Update its software or try a different device in the same spot to find out.
Costs
Fixing a dead spot ranges from nothing to a few hundred pounds. Our article on Wi-Fi extender and mesh installation costs gives typical figures and what labour to expect.
Common mistakes
- Buying the most expensive kit before trying a better router position.
- Putting an extender in the dead spot.
- Using several extenders in a chain, which halves speed each hop.
- Blaming the broadband provider for a coverage issue that is internal to the home.
Getting help
If the layout is tricky, a technician with the right tools can solve this in a visit. On Compito you can search by postcode, compare ID-verified local providers and send a request describing the rooms affected. You receive an offer to accept and pay online and can message the provider to discuss options. See tech support services.
A worked example: the garden office
An owner works from a garden office twelve metres from the house, with a router in the front hall. Wi-Fi in the office is barely there and video calls fail. An extender in the kitchen gets a poor result, because the signal reaching it is already weak and the kitchen is separated from the office by two walls and a patio door. A cable run from the router to an outdoor-rated access point on the back wall of the house, pointing towards the office, gives a strong, steady connection. The fix is more involved, but it matches the problem: a long distance, with obstacles, needing a wired link.
Matching the fix to the type of dead spot
| Type of dead spot | Often best fix |
|---|---|
| One room, near the router | Reposition router or extender midway |
| Upstairs rear bedroom | Access point on the landing, or mesh unit |
| Loft room or conversion | Wired access point, possibly powerline |
| Garden office or garage | Wired or outdoor-rated access point |
| Whole floor | Mesh with wired link between units |
How to check if an extender will help
- Stand halfway between the router and the dead spot.
- Run a speed test there. If it is fine, an extender could work there.
- If the result is already poor, move closer to the router and repeat. The unit needs a decent signal to repeat.
- Keep in mind that a wired link will always beat a wireless relay.
Edge cases
Listed buildings and thick stone walls. Drilling may be restricted, and wireless signal is limited. Powerline or a carefully routed cable may be the practical answer, with advice from the owner or authority if needed.
Rented flats. Choose kit that does not need drilling, and ask before running cables on shared walls.
Homes with many wireless gadgets. Smart devices crowd the 2.4GHz band. A separate network for gadgets can free the faster band for laptops and phones.
A realistic expectation
Wi-Fi will never be perfect in every corner. The aim is a reliable connection in the places you actually use, and a cable for the devices that matter most, such as a work desk or a television.
Frequently asked questions
Will a Wi-Fi extender slow my internet?
It can reduce speed on the extended part because it relays traffic, but it is usually faster than a very weak direct signal. A wired or mesh solution tends to be better.
Why is Wi-Fi fine downstairs but poor upstairs?
Floors and ceilings absorb signal, and router placement near the floor makes it worse. Raising the router or adding an access point upstairs usually helps.
Does the Wi-Fi name matter?
Using one name across bands and mesh units is convenient, but if devices stick to a weak connection, a separate name for each band can help you choose manually.