Quick answer: yes. A mobile signal booster works in a flat as long as there is some signal outside, for example on the balcony or at a window. The outdoor antenna goes on the balcony, window frame or outside wall, and a 300 m² kit covers most flats. Compare kits in the 4G booster shop or the 5G booster shop.

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

Why signal is often bad in flats

Concrete floors, steel frames, foil-backed insulation and coated glass all block mobile signal. Lower floors and flats facing away from the nearest mast are hit hardest. You may have full bars on the balcony and nothing in the bedroom.

How a booster fixes it

The outdoor antenna picks up the signal where it is strongest, the booster strengthens it, and the indoor antenna spreads it through the flat. Calls, texts and 4G/5G data all improve, for everyone in the flat, whatever their phone.

Where to put the antennas

• Outdoor antenna: balcony rail, window frame or outside wall, on the side with the most bars (check with Wi-Fi off).
• Cable: a flat window jumper cable passes through a closed window, so you don’t need to drill.
• Indoor antenna: central in the flat, away from the outdoor antenna, ideally with a wall between them.

Which kit to buy

• Most flats: 4G/5G home booster up to 300 m²
• Large flats or weak outside signal: 4G/5G home booster up to 500 m²
• Flatmates on different networks: Universal booster up to 300 m² covering EE, O2, Vodafone and Three

Browse every kit in our mobile signal booster shop.

Frequently asked questions

Can I install a signal booster in a rented flat?

Usually yes, with your landlord’s permission for the outdoor antenna. A window jumper cable or a balcony mount avoids drilling.

Where does the outdoor antenna go in a flat?

On a balcony, a window frame or an outside wall on the side facing the best signal. Check with Wi-Fi off to find the strongest spot.

What size booster does a flat need?

Most flats suit a 300 m² kit. Large flats or weak outside signal suit 500 m².

Will it help my neighbours too?

The boosted signal is focused indoors, so it mainly helps your own flat.