Why is my baby monitor picking up the neighbours in a terrace?

Why do terraces pick up next door?

Two different things get called 'picking up the neighbours'. One is audio bleed: an older analogue nursery monitor shares a public channel, so another house on the same street can appear on your speaker. Angelcare's AC327 manual says the parent unit may pick up other nursery monitors and that other households may pick yours up, and tells you to switch both units off when they are not in use.

The other is radio clutter: every house on the terrace runs 2.4 GHz Wi-Fi, plus microwaves, cordless phones and cameras. Angelcare lists neighbours' Wi-Fi as something you cannot change, and lists routers, microwaves, wireless speakers, games consoles and phones as the usual indoor sources. Ofcom-commissioned work on the 2.4 GHz band (Mass Consultants, 2009) found that non-Wi-Fi gadgets — including baby monitors and audio-video senders — were a major source of interference in UK homes.

A digital parent-unit pair (the screen that came in the same box) is meant to stay locked to its own camera. If you can hear a baby that is not yours, treat it as a channel or analogue problem first, not as proof the kit is broken. Angelcare says interference can occur without the monitor being faulty.

Party wall versus a crowded 2.4 GHz street

A party wall is brick, but it is also the shortest path to the next nursery. Sitting the cot-side unit on that wall aims the radio at next door. Slide it toward the room and the stairwell, the same way you would walk around a chimney breast.

How do I check channel and distance?

Stay on placement and channel. A full DECT-versus-Wi-Fi explainer is a different page; here you only need to know whether your kit lets you pick a channel and whether both ends are off the party wall.

1. 1
   Read the channel menu Some parent units list 8–32 channels (Which? notes channel counts on several LeapFrog and VTech kits). Angelcare's AC403 page says changing channel can stop interference. Other kits auto-pick and will not let you choose — Angelcare's AC527 says that model auto-selects.
2. 2
   Move both units a metre Off the party wall, off the router, off the microwave. BT: keep units at least one metre from each other and from TVs, PCs, routers and microwaves. Angelcare: never run the monitor next to a microwave, cordless or mobile phone.
3. 3
   Walk-test after 7pm Carry the parent unit to the kitchen, the front room and the garden door while the street is busy. A morning pass misses the load. Use the return-window room list if the box is still in date.
4. 4
   Power unused kits off If you have a second, older analogue monitor in a box, or a travel kit on charge in the hallway, switch it off. Two kits in one house can add to the clutter; BT says it cannot promise a second kit in the same premises will be free of interference.

Analogue audio versus a paired digital parent unit

If the speaker plays a nursery that is not yours, you are probably on a shared analogue channel. A paired digital parent unit should not latch onto next door's camera. Hearing a neighbour on a digital kit more often means your units are fighting their Wi-Fi, not that you are tuned to their baby.

If a Wi-Fi app shows a camera name you do not recognise, stop and check whose account is signed in. A used camera can still sit on the seller's cloud login — that is the previous-owner checklist, not a terrace radio fix.

The Lullaby Trust's position is that a monitor is not a substitute for an adult in the same room for the first six months. Clearing terrace noise does not change that.

What if I can still hear them after a walk-test?

• Still another baby's cry on an analogue kit — you have exhausted channel and distance. That radio type shares the street. A digital parent-unit pair is a different product class; do not expect a mesh node to split an analogue channel.
• Still freezes at 7pm on a digital kit — the party-wall path or the router is still in the way. Try the doorway placement from the chimney-breast guide, then the brick / booster page. Mesh helps an app camera on your broadband; it does not lift a closed parent-unit link.
• A stranger talking through a Wi-Fi camera — that is an account or password problem. Which? and the NCSC both tell you to change default passwords and turn on two-step verification. Reset and new account first.

In shortOn a terrace, separate 'I can hear their baby' (channel / analogue) from 'their Wi-Fi wrecks my picture' (placement / 2.4 GHz). Change channel if you can, sit both units a metre off the party wall, and walk-test after 7pm. Mesh does not split a shared analogue channel.