It starts with a sound you can’t quite place – a faint scratching, a flutter, or maybe a rustling noise coming from somewhere behind the wall or above the fireplace. Then the smell hits. If this scenario sounds familiar, there’s a good chance you have an uninvited guest living in your chimney. It’s one of the most common calls we receive at Lords Chimney, and unfortunately, it’s also one of the most misunderstood problems homeowners face.

So can animals really enter your home through your chimney? The short answer is yes – and more easily than you might think. Here’s what you need to know about which animals are most likely to find their way in, how they get there, and most importantly, what you can do about it.

Why Do Chimneys Attract Wildlife?

To understand why animals target chimneys, you have to think like a wild creature looking for shelter. Your chimney offers warmth, protection from predators, a dark and enclosed space, and a high, hard-to-reach entry point. From an animal’s perspective, it’s essentially a hollow tree – and hollow trees make excellent homes.

Spring and summer are peak seasons for animal intrusion. Birds begin nesting, squirrels search for safe places to raise their young, raccoons scout for denning sites…even wasps have been known to enter. An uncapped chimney sitting on top of a warm house is an irresistible invitation. And once an animal moves in, eviction becomes far more complicated (and expensive) than prevention ever would have been.

What Animals Most Commonly Enter Chimneys?

Not every animal that ends up in a chimney is the same, and the species involved often determines what kind of problem you’re dealing with.

Chimney Swifts

Chimney swifts are small migratory birds that are actually federally protected under the Migratory Bird Treaty Act. They are drawn to large masonry chimneys, where they attach their nests to the interior flue walls. Here’s the tricky part – it’s illegal to remove chimney swifts, their nests, or their eggs once they’ve taken up residence. You must wait until they have completed their nesting cycle and migrated south before any cleaning or repairs can be done.

This makes prevention absolutely critical. Installing a chimney cap before chimney swifts arrive in the spring is the only reliable way to keep them out of your flue.

Raccoons

Raccoons are intelligent, persistent, and surprisingly capable when it comes to entering a chimney. Female raccoons in particular look for dark, enclosed, high spaces to raise their young – and the smoke chamber of a fireplace fits the bill perfectly. Raccoons can cause significant damage to chimney components as they move around and nest, and their droppings can pose a serious health risk due to the potential for raccoon roundworm.

If you suspect a raccoon is in your chimney, do not attempt to smoke them out. This approach can injure or kill baby raccoons that may be present and can also create a dangerous situation if the animal panics and enters your living space.

Other Birds

Beyond chimney swifts, a variety of common birds – like sparrows, starlings, and pigeons among them – will attempt to nest in chimneys. Unlike chimney swifts, these species are not federally protected and their nests can be removed. However, nesting material is highly flammable and can completely block a flue, creating both a fire hazard and a serious ventilation problem.

Squirrels

Squirrels often fall into chimneys accidentally while exploring the rooftop, but they can also enter intentionally if a chimney cap is missing or damaged. Once inside, squirrels can chew through damper components, leave behind droppings and nesting material, and occasionally find their way into the living space if the damper is left open.

Bats, Snakes & More

While less common, bats and snakes have also been found in chimneys. Bats can squeeze through incredibly small openings and may roost near the top of the flue. Some snake species are excellent climbers and can scale the rough interior of a masonry chimney with surprising ease. These encounters are far less frequent but are a good reminder that any gap or opening in a chimney system is a potential entry point for wildlife.

How Do Animals Get Inside of a Chimney?

The answer is usually simple: there’s nothing stopping them. An uncapped chimney is a wide-open entry point. Even a damaged or improperly fitted chimney cap can leave enough of a gap for small animals and birds to squeeze through.

Other common entry points include:

• Cracked or missing mortar joints in the masonry
• Deteriorated chimney crowns that leave gaps at the top of the flue
• Rusted or broken chimney caps with holes or loose mesh
• Gaps around the flashing where the chimney meets the roofline

Regular chimney inspections are the best way to identify and close these entry points before wildlife takes advantage of them.

What To Do If You Suspect an Animal Is in Your Chimney

First, keep the damper closed. This is your primary barrier between the inside of your chimney and the inside of your home. If the damper is open or damaged and an animal has already entered the firebox area, call a wildlife removal professional before attempting anything on your own.

Once the animal has been humanely removed according to local wildlife regulations, contact a CSIA-certified chimney professional to inspect and clean the flue. Animal nests, droppings, and debris must be fully removed before the chimney is safe to use again. Our team at Lords Chimney can document the damage, handle the cleanup, and make the necessary repairs to ensure your chimney is fully protected going forward.

Prevention Is Always the Best Strategy: Contact Lords Chimney

The most effective and affordable solution to animal intrusion is a properly installed, high-quality chimney cap. A stainless steel chimney cap with a mesh cage not only keeps animals out but also prevents moisture, leaves, and other debris from entering the flue.

For homeowners in the Greater Houston area, we also recommend scheduling annual chimney inspections – ideally in the spring – to catch any damage that could create a new entry point for wildlife. Addressing small cracks, replacing worn mesh, and maintaining a secure chimney cap is far less costly than dealing with a full wildlife intrusion and the damage that comes with it.

At Lords Chimney, we’ve seen firsthand what happens when animals take up residence in a chimney. From damaged flue liners to completely blocked flues and serious health hazards, the consequences of ignoring the problem – or failing to prevent it in the first place – can be significant. Don’t wait – book your appointment with us today.