Quick answer: pick the booster by the floor area you actually use and how strong the signal is outside. A flat or small house usually needs a 300 m² kit, most 2–4 bedroom houses need a 500 m² kit, and large homes, barns and offices need 1,000 m² or more. If the signal outside is weak (one bar), go one size up. Compare kits in our mobile signal booster shop.

Free delivery in 5–7 working days · 30-day returns · Works when there is some signal outside.

Booster size by property type

Property Typical floor area Kit size to choose
1–2 bed flat or terrace 50–100 m² 300 m²
3-bed semi or detached 90–150 m² 300 m² (strong outside signal) or 500 m²
4–5 bed house, two or three floors 150–250 m² 500 m²
Large house, barn conversion, small office 250–600 m² 1,000 m²
Warehouse, farm buildings, large business 600 m²+ 5,000 m²

The kit size is the most the booster can cover in good conditions. Thick stone walls, foil-backed insulation and energy-efficient glass all reduce real coverage, which is why a bit of headroom pays off.

Why the signal outside matters as much as size

A booster takes the signal its outdoor antenna picks up and spreads it indoors. With two or three steady bars outside, a smaller kit covers its full area. With one bar, the same kit covers less, so a bigger kit (or the optional LPDA outdoor antenna) helps. If there is no usable signal at all outside, no booster can fix that.

To check, switch Wi-Fi off and walk around the outside of your home. Note where you get the most bars. That is where the outdoor antenna should go.

Pick the right network too

Size is only half the choice. Single-network kits are matched to one provider: EE, Vodafone, O2 or Three. If people in your home use different networks, a universal kit such as the Home Pro Universal Signal Booster boosts them all.

Popular kits by size

Not sure? Our buying guide walks through every step, or browse the full signal booster shop.

Frequently asked questions

What size signal booster do I need for a 3-bedroom house?

Most 3-bedroom houses suit a 500 m² kit. If the signal outside is strong and the house is compact, 300 m² can be enough; if the outside signal is weak, go up a size.

Does a bigger booster give a stronger signal?

A bigger kit has more power to spread the signal over a larger area and copes better with weak outside signal. It does not create signal where there is none outside.

Can one booster cover two floors?

Yes. Place the indoor antenna centrally, near the stairs or on the upper floor ceiling. Large or thick-walled homes may need a 1,000 m² kit or a second indoor antenna.

How long does delivery take?

Delivery is free in 5–7 working days, and you get 30-day returns.