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What to do if…
you hear birds in a chimney or wall cavity and think they may be trapped

Short answer

Stop using the fireplace/stove or any appliance venting into that flue, keep things calm, and contact a wildlife rescue/animal welfare service or a chimney professional for advice before you try to reach the birds.

Do not do these things

Don’t light a fire, run a wood burner, or use any appliance that vents into the chimney/flue (smoke, heat, and fumes can injure birds and create dangerous blockages).
Don’t try to “smoke them out”, use sprays, pour water down, or use loud banging to force movement.
Don’t push brushes/rods up the flue, or dismantle the fireplace/cut into walls unless a professional tells you to (you can injure birds or turn nesting material into a blockage).
Don’t block the top of the chimney or outside vents “to stop them escaping” (you may trap them with no exit).
Don’t handle a bird with bare hands. Also avoid handling at all unless you have to for immediate safety—wildlife rescues may advise extra caution during avian flu controls.
Don’t assume it’s “definitely trapped”: it may be an active nest with chicks that are noisy but not in immediate danger.

What to do now

Make it safe to pause. If it’s the chimney/flue: stop using it immediately (no fires; don’t run any appliance that vents into that flue). If it’s near a bathroom/kitchen extractor/vent: switch that fan off for now.
Locate the sound without opening anything. Stand quietly in nearby rooms for 30–60 seconds and note where it’s loudest:
- clearly in the chimney/fireplace/stove area, or
- in a wall/ceiling void (often near vents, eaves, soffits).
If a bird is actually in the room (e.g., came through the fireplace):
- Keep people and pets out; close interior doors so it stays in one room.
- Dim the room (turn off lights; close curtains) and open a clear exit (a window, or an external door if that’s safer/easier).
- Wait quietly. If it can’t leave, looks injured, or is exhausted, go to step 5.
If it sounds like chicks begging (rapid, repetitive peeping) but you don’t see a bird inside: treat it as a possible active nest. Keep the area calm and don’t disturb the chimney/wall—parents may still be feeding them.
Get expert help early (most important).
- Contact a wildlife rescue/rehabilitator or animal welfare organisation for advice.
- If it’s a chimney/flue issue (especially if you suspect nesting material or a bird part-way down), contact a qualified chimney sweep for safe assessment.
If you suspect fumes or a flue blockage: ventilate the room, keep the appliance off, and get professional assessment before using anything connected to that flue again. If you suspect a gas emergency, use the UK gas emergency helpline.
If you can safely observe outside (from ground level only): look for birds entering/exiting a chimney pot, vent, or gap under eaves. Share what you see with the rescue/professional.
Have key details ready when you call: where you hear it, how long it’s been going on, whether you’ve seen adults flying in/out, and whether any appliance shares that flue.

What can wait

You don’t need to decide today about fitting a chimney cowl/guard or sealing gaps.
You don’t need to identify the species right now.
You don’t need to clean out or “fix the nest problem” immediately—first prioritise safety and getting the right help.

Important reassurance

This is common, especially in nesting seasons. Noise doesn’t automatically mean immediate danger. The safest first move is usually to stop using the flue, keep things calm, and get advice before doing anything that could trap them further, harm them, or create a home safety hazard.

Scope note

These are first steps to reduce harm and prevent irreversible mistakes. A wildlife rescue and a chimney professional can advise what’s safe, lawful, and practical for your exact setup.

Important note

This is general information, not professional or legal advice. If you suspect fumes, a blocked flue, or a gas safety issue, treat it as urgent and get qualified help before using the appliance again.

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What to do if…you hear birds in a chimney or wall cavity and think they may be trapped