If you’ve been hearing strange noises overhead or finding chewed-up debris in your insulation, you might not be alone—an attic is one of the most common places for unwanted wildlife guests. One of the usual suspects is the squirrel, a small but surprisingly disruptive visitor when it moves into human structures.
Here’s how to tell if you’re dealing with a squirrel infestation and not just normal house settling.
Signs You Have Squirrels in Your Attic
Scratching, scurrying, or rolling sounds
One of the earliest and most reliable indicators is noise. Squirrels are active during the day, especially early morning and late afternoon. If you hear rapid scratching, scampering, or rolling sounds above your ceiling during daylight hours, it’s a strong clue.
Unlike nocturnal animals, squirrels tend to be busy when you are awake, which makes their presence more noticeable.
Chewed wires, wood, or insulation
Squirrels have constantly growing teeth, which means they must gnaw to keep them worn down. Inside an attic, that habit becomes destructive fast.
Look for:
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Frayed electrical wiring (a serious fire hazard)
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Shredded insulation
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Chewed wooden beams or trim
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Gnaw marks around vents or entry points
Even small damage can escalate quickly if the infestation grows.
Droppings and nesting material
Squirrel droppings are typically small, dark, and pellet-shaped, often scattered rather than piled.
You may also find nests made of:
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Leaves
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Twigs
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Shredded insulation
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Paper or fabric scraps
These nests are usually tucked into corners, near rooflines, or around attic vents.
Entry holes and roof damage
Squirrels are excellent climbers and can exploit even small weaknesses in your home’s exterior.
Common entry signs include:
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Gnawed roof edges or soffits
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Loose or damaged shingles
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Enlarged vent openings
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Holes near eaves or fascia boards
Once they find a way in, they tend to return repeatedly.
Strange odors in the attic or upper rooms
A persistent musky or ammonia-like smell can indicate urine buildup or nesting activity. Over time, odors may seep into living spaces, especially during warm weather.
If the smell seems to come and go, it could correlate with animal movement or nesting activity changes.
Visible sightings around the roofline
If you notice a squirrel repeatedly running along your roof, disappearing into the same gap, or lingering near vents, that’s a strong sign of an established entry point.
Squirrel are creatures of habit once they identify a safe route, they tend to reuse it.
Why squirrels choose attics
Attics provide everything a squirrel needs:
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Warmth and shelter from predators
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Dry, insulated nesting space
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Easy access via trees, gutters, or rooflines
In colder climates like northern Michigan, attics become especially attractive during fall and winter as squirrels prepare for colder months.
Why you shouldn’t ignore the signs
A small squirrel presence can turn into a larger infestation quickly. Risks include:
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Electrical fires from chewed wiring
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Structural damage to insulation and wood
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Contamination from droppings and urine
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Secondary pest issues (fleas, mites)
The longer they stay, the more expensive removal and repairs become.
What to do if you suspect squirrels
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Avoid sealing entry points immediately (they may be trapped inside)
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Listen for activity patterns over a day or two
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Inspect the exterior for entry holes
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Contact a wildlife removal professional for safe exclusion and cleanup
Squirrels may seem harmless outdoors, but inside an attic they can become persistent, destructive tenants. Catching the signs early can save you from major repairs and a much bigger infestation down the line.