5 Signs You Have a Bird Nest in Your Chimney (And What to Do About It)
5 Signs You Have a Bird Nest in Your Chimney And what to do about it
As the weather warms up across Essex and Hertfordshire, local wildlife goes into overdrive. It's lovely to hear birds singing in the garden, but a lot less charming when they decide to set up home inside your chimney.
The five signs of a bird nest in your chimney are twigs or debris in the grate, scratching or chirping noises, smoke coming back into the room, damp or unpleasant smells, and a sudden increase in flies around the hearth. If you notice any of them, don't light the fire. Book a CCTV inspection so a professional can confirm the nest and check whether it's still active.
Jackdaws and starlings are notorious for dropping twigs down chimney pots to build deep, densely packed nests. A nest in your flue isn't just an annoyance. It's a serious safety hazard that can block smoke, push carbon monoxide into your home and cause chimney fires.
Not sure if you're hosting some feathered squatters? Here are the five tell-tale signs.
The 5 signs of a bird nest in your chimney
1. Twigs and debris in your grate
Usually the most obvious red flag. Twigs, dry grass, leaves or mud falling into your log burner or open fire mean a bird is probably busy right above you. Jackdaws keep dropping material until it wedges, so a nest can end up several metres deep.
2. Strange noises behind the wall
Rustling, scratching or flapping from the fireplace or chimney breast. Once eggs hatch, you may also hear high-pitched chirping, especially early in the morning. Regular noise is a strong sign of an active nest.
3. Smoke coming back into the room
A chimney needs a clear path to draw smoke up and out. If smoke billows back into your living room as soon as you light the fire, the flue is blocked. Put the fire out safely and don't relight it.
4. Unpleasant smells
A damp, earthy smell from the fireplace is a strong indicator. Droppings, rotting nest material and, sadly, birds that didn't survive the drop can all create a noticeable, foul odour in the room.
5. A sudden increase in flies or bugs
Flies, maggots or small beetles appearing around the hearth may be feeding on the organic matter in a nest up in your flue.
Spotted one of these?
A CCTV inspection shows exactly what's in your flue, and whether the nest is still in use.
Book a CCTV inspection →What should you do if you suspect a nest?
Whatever you do, don't light a fire to "smoke them out". Nesting material is very dry and highly flammable, so it can easily start a chimney fire, and a blocked flue can force carbon monoxide into your home.
Active nests are protected by law. Under the Wildlife and Countryside Act 1981, it's an offence to intentionally take, damage or destroy the nest of any wild bird while it's in use or being built. Smoking birds out or pulling a nest down yourself could land you with a fine.
How Sweep Sisters deal with chimney nests
If you suspect a nest, the safest thing to do is call a professional. This is how our HETAS certified team handles it:
CCTV inspection
We run a specialist chimney camera up your flue to confirm the nest is there and check whether it's currently active.
Safe removal
Once the nest is abandoned or the chicks have fledged, usually by late summer, we use heavy-duty nest removal tools to pull out the packed debris without damaging your brickwork.
Prevention
With the chimney swept and clear, we recommend fitting a bird guard or cowl to the top of the pot so the birds can't come back.
Want the full picture on timing, the law and bird guards? Read our guide on how to stop birds nesting in your chimney.
Common questions
Can I light a fire to get rid of a bird nest in my chimney?
No. Nests are highly flammable and can cause a chimney fire, a blocked flue can push carbon monoxide into your home, and harming an active nest is illegal under the Wildlife and Countryside Act 1981.
When can a bird nest be removed from a chimney?
Only once it's no longer in use, after the chicks have fledged. For most birds that's usually from late summer onwards. A CCTV inspection confirms whether the nest is still active.
Which birds nest in chimneys?
In Essex and Hertfordshire it's usually jackdaws, which drop sticks down the pot until they wedge. Starlings also nest in chimneys.
How do I stop birds nesting in my chimney again?
Fit a bird guard or cowl once the chimney has been cleared and swept. The best time to fit one is outside nesting season, from late summer to late winter.
Related guides
Stopping birds nesting
The law, timing and bird guards.
Signs of a blocked chimney
Warning signs and when to call a sweep.
Chimney services and prices
Sweeps from £95, CCTV, cowls and repairs.
Book a sweep in your area
- Chimney sweep Essex
- Chimney sweep Hertfordshire
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- Colchester
- Brentwood
- Hertford
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- Watford
Hearing scratches or finding twigs?
Don't let a bird nest put your home at risk. Sweep Sisters provide expert, female-led chimney care, bird nest removal and cowl fitting across Essex and Hertfordshire.