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Safe to use for now, and it gets more expensive every month you leave it.
The short answer
Do not smoke it out. It is cruel, it rarely works, and it leaves you with a blocked flue.
An animal in chimney flues is nearly always a raccoon, a squirrel or a bird, and the time of day tells you which. Raccoons are active at dusk and through the night, and a mother denning on the smoke shelf will defend it — that is a job for someone equipped rather than a torch and optimism. Squirrels scrabble during the day and often cannot climb back out of a smooth flue. Birds chatter and are frequently protected. All three end the same way: whatever is in there comes out, and a cap goes on so it does not happen again next spring.
The time of day tells you

Night scrabbling is a raccoon. Daytime scratching is usually a squirrel. Rhythmic chattering is birds, and those may be protected.
Before we get there
None of this fixes it. All of it stops the problem getting more expensive between now and the visit.
Do not light a fire. Nesting material above the firebox is dry tinder and there may be something alive in it.
Keep the damper closed so nothing gets into the room, and keep pets out of that room.
Listen at dusk and again at midday. When it is active is the most reliable identification you can make without a torch.
Do not try to smoke or flush it out. Illegal for protected species, cruel for any, and it leaves a carcass and a blockage.
If something has got into the room, open an exterior door, close the interior ones, and leave it a clear route out.
Work out which is yours
Ordered by how often it turns out to be the answer, so you can stop reading once you recognise yours.

This is the cause rather than a contributing factor. An open flue is a sheltered vertical shaft that nothing else on a roof offers, and until it is capped this repeats.

The flat ledge behind the damper is a near-perfect den site — dry, dark and defensible. Usually a mother with young in spring, which is why removal takes care rather than force.

Squirrels get in easily and cannot grip a smooth clay liner going back up. The scrabbling is an animal trying to escape rather than one settling in, and it does not resolve itself.

From the ground a rusted cap looks like protection. From the air it is an open door. Worth checking before concluding there is no cap.

Removal without a cap is a visit you repeat every spring. The clearing is the easy half; the cap is the half that lasts.
What actually fixes it
Fall Special
Call or book today and we'll do our best to get a pro to you tomorrow.
Anything that needs attention is shown to you and explained in plain words.
If something needs fixing, you get the price in writing first. Saying no costs nothing.
Good to know

Founded by Ryan Carter in 2019. Every page you read here is reviewed by Ethan Miller, our chimney specialist. A written estimate before any work, and the findings in writing whether or not anything needs doing.
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