Birds, squirrels, and raccoons love an uncapped chimney — it looks like a hollow tree. But nests block the flue, create fire and odor problems, and can trap the animal inside. Here is how to handle it and keep them out for good.
Why animals get in
An open flue is a warm, sheltered spot that mimics a hollow tree, making it ideal for nesting birds (especially chimney swifts), squirrels, and raccoons. Once inside, they build nests that block the flue and can be very difficult to remove.
The problems they cause
- A blocked flue that pushes smoke and carbon monoxide back into the home
- A fire hazard from flammable nesting material near the firebox
- Foul odors from droppings or a trapped, deceased animal
- Damage to the liner and damper
Safe removal
Never light a fire to drive an animal out — it is dangerous and inhumane. The safe approach is to have the flue professionally cleared. Note that some birds, like chimney swifts, are protected, so timing and method matter; a technician handles it properly and cleans out the nesting debris.
Keeping them out for good
The permanent solution is a properly fitted chimney cap with animal-resistant mesh. Once the flue is cleared, a cap keeps birds, squirrels, and raccoons out while still allowing the chimney to draft. It is an inexpensive fix that prevents a recurring problem.
Hearing noises in your chimney?
Careful work, up-front pricing, seven days a week in La Grange and the western suburbs.
Call (708) 432-5330Frequently asked questions
How do I get an animal out of my chimney?
Have the flue professionally cleared — never light a fire. Some birds are protected, so proper timing and method matter, and the nesting debris needs cleaning out.
How do I keep animals out of my chimney?
A correctly fitted cap with animal-resistant mesh is the answer. Clear the flue first, then cap it so they cannot return.
Are chimney swifts protected?
Yes, chimney swifts are protected migratory birds, which affects when and how a nest can be removed. A professional handles this correctly.
Can animals damage my chimney?
Yes. Nests block the flue and are flammable, droppings cause odor and corrosion, and animals can damage the liner and damper.
Written by Adam Evans, owner of Chimney Sweep Brothers and a chimney technician with 12 years of experience serving La Grange, IL and the western suburbs.