How to improve Wi-Fi coverage in a large house or villa

It’s one of the most common complaints in large homes, villas and multi-storey houses: the connection is fine next to the router but slows down or drops in the far bedroom, on the terrace or in the garage. It’s not your fibre plan — it’s how the signal is distributed inside the house. Spanish construction, with thick concrete slabs, solid brick and stone walls, makes this especially noticeable.

Why Wi-Fi struggles in a large house

• A single transmitter: the ISP router usually sits where the fibre enters — often at one end of the house.
• Walls and floors: concrete, solid brick, stone and underfloor heating with metal mesh absorb a lot of signal.
• 5 GHz is fast but has shorter range and penetrates obstacles less well than 2.4 GHz.
• Interference: neighbouring networks on the same channels, especially at 2.4 GHz.
• Lots of devices: TVs, phones, cameras and smart-home kit competing for one access point.

Solutions, from best to worst

Solution	Performance	When to use it
Wired access points with PoE	Excellent	Whenever a network cable can be run
Mesh with wired backhaul	Excellent	When the nodes can be cabled
Wireless mesh	Good	When there’s no way to run cable
Powerline adapters	Variable	Stopgap; depends on the wiring
Classic range extenders	Limited	Temporary patch only

Wired access points

Each access point is cabled back to the router or a switch and broadcasts the same Wi-Fi network; devices hand over between them as you move around. With PoE (power over the network cable itself), they mount on ceilings or walls with no socket nearby.

Mesh systems

Several nodes talk to each other to form one network. If they link by radio, part of their capacity is spent on that link; if they can be wired together, performance improves dramatically.

Extenders

They repeat the signal they receive but usually cut throughput and create separate network names or abrupt hand-overs. Useful as a patch, not a solution.

How to plan the network

1. Coverage survey: measure real signal in every room and outdoor area, not just on paper.
2. Access-point placement: centred on where people use devices, ceiling-mounted where possible, at least one per floor in large homes.
3. Cabling: use existing telecom conduits or false ceilings. See Wi-Fi vs Ethernet.
4. Configuration: one network name, transmit power tuned so devices roam between access points, non-overlapping channels and, where supported, fast-roaming features.
5. Segmentation: a guest network and, if you have automation or cameras, a separate network for them.

Bands and generations in brief

• 2.4 GHz: longer range, lower speed, more interference — fine for sensors and smart-home devices.
• 5 GHz: more speed and channels — the main band for phones, laptops and TVs.
• 6 GHz (Wi-Fi 6E and Wi-Fi 7): lots of capacity and little interference, but shorter range; needs compatible devices.

Worked example: a three-storey villa

A home with a basement, ground floor and first floor, solid brick load-bearing walls and the ISP router in the garage. The survey shows usable signal only in the basement and part of the ground floor. The fix:

• ISP router in bridge mode and a console managing the network.
• PoE switch in the comms cabinet.
• Four ceiling-mounted access points: basement, living room, first-floor landing, plus one outdoor unit facing the pool.
• Cabling run through the existing telecom conduit on each floor.
• Configuration: one network name, tuned power levels and a separate guest network.

Afterwards the house behaves as one network, and phones hand over between access points without dropping a video call.

Common mistakes

• Buying a “more powerful” router and expecting it to reach three floors.
• Daisy-chaining extenders and multiplying drop-outs.
• Hiding access points in cupboards or behind the TV.
• Running every access point on the same channel.
• Forgetting outdoor areas, the garage or the guest house (see Wi-Fi for the garden and pool).
• Mixing brands with no central management.

Conclusion

Good Wi-Fi in a large house means more transmission points, connected by cable wherever possible. A coverage survey tells you how many access points you need and where; good configuration makes the house behave as one network. Centrally managed platforms such as UniFi make this design easier (see what is UniFi).

Domolife carries out coverage surveys and installs Wi-Fi networks for homes and businesses in Valencia. Request yours.