Squirrels in an attic make fast, scurrying sounds, persistent scratching, and a grinding or gnawing noise as they chew on wood and other materials. The biggest giveaway is timing: if the noise starts early in the morning, around sunrise, or near dusk, a grey squirrel is the most likely culprit. Nighttime scratching points to a different animal entirely.
What Squirrels Sound Like in an Attic
The most common squirrel noise is rapid running or scampering across the attic floor. Squirrels are fast and light enough to sound like something rolling or darting from one side of the ceiling to the other. Between the bursts of movement, you’ll often hear scratching in a single spot. Squirrels carry nuts into attics and try to bury them in the insulation. Once they dig through insulation and hit drywall, they keep scratching, sometimes for minutes at a time. They also tunnel through insulation to build dens and travel paths, which produces a sustained rustling sound.
Chewing is the other signature squirrel noise. Their teeth grow continuously throughout their lives, so they gnaw on wood, plastic, and even metal to wear them down. If a squirrel chews on an aluminum gutter or flashing near your attic, it creates a surprisingly loud grinding sound that can carry through the house. Inside the attic, chewing on wood framing or stored items produces a quieter but steady gnawing.
Timing Tells You More Than the Sound Itself
Grey squirrels (the most common species found in attics across North America) are diurnal, meaning they’re active during daylight. Early morning, right around sunrise, is peak activity time. You may also hear them around dusk as they settle in. If the sounds happen primarily during these windows and go quiet overnight, squirrels are the strongest bet.
Nighttime attic noises are a different story. Flying squirrels are nocturnal and make a faster, lighter sound, often described as a tapping or finger-drumming pattern rather than heavy scurrying. Rats and mice are also active after dark. Rats produce scratching and gnawing similar to squirrels but tend to be lighter and more sporadic. Mice are quieter still, with faint scratching and skittering. Raccoons make heavier thumping sounds, more like footsteps, and are typically nocturnal as well.
Here’s a quick comparison:
- Grey squirrels: Fast running, scratching, chewing. Active mornings, daytime, and dusk.
- Flying squirrels: Light, rapid tapping and scurrying. Active at night.
- Rats: Scratching, gnawing, movement along walls. Active at night.
- Mice: Faint scratching and skittering. Active at night.
- Raccoons: Heavy thumping, vocal sounds. Active at night.
Physical Evidence to Confirm It
Sound alone can narrow things down, but a quick visual check of your attic (or roofline from outside) can confirm the diagnosis. Squirrel droppings are dark brown to black pellets, roughly half an inch long, shaped like small coffee beans with rounded edges. As they age, they lighten to a reddish or grayish color. Unlike rat droppings, which are scattered one at a time along travel paths, squirrel droppings appear in small piles near their nesting area or close to entry points.
Look for a chewed-out entry hole along your roofline, soffit, or where a gutter meets the fascia board. Squirrels are strong chewers and will enlarge small gaps into functional doorways. Inside the attic, you may see insulation that’s been tunneled through, flattened, or pushed aside. Nesting material like shredded insulation, leaves, and bark is another clear sign.
Why You Shouldn’t Ignore It
Squirrels chew through electrical wiring. Their teeth never stop growing, so gnawing is a biological necessity, and wires happen to be the right size and texture. Exposed or damaged wiring can overheat and spark a fire. One home safety company reported mitigating over 50 fire hazards caused by squirrels in a single year. Wildlife is responsible for power outages affecting 13 million Americans annually, and squirrels are the most common culprit.
Beyond fire risk, squirrels compress and destroy attic insulation, reducing your home’s energy efficiency. They contaminate insulation with urine and droppings, and they can chew through roof decking, siding, and drywall. The longer they stay, the more expensive the repairs.
Breeding Season Complicates Removal
Squirrels breed twice a year: once in late winter or early spring, with babies arriving in March and April, and again in late summer, with a second litter in late August through September. These are the peak months for attic infestations because pregnant females seek sheltered spaces to nest.
This matters because sealing an entry point while a mother or dependent young are still inside creates a serious problem. Baby squirrels can’t leave on their own. They may fall into wall voids, become trapped, and die, creating odor issues and attracting insects. If you’re hearing sounds during breeding season, it’s worth assuming babies could be present before taking action.
What Removal Looks Like and Costs
Professional squirrel removal from an attic typically costs between $280 and $920, depending on the severity. The national average is around $300 for straightforward cases. The most common approaches are one-way exclusion doors (which let squirrels leave but not re-enter, running $200 to $400) and live trapping with relocation ($200 to $500).
The removal itself is only part of the cost. An initial inspection runs $100 to $150. Sealing entry points and adding preventative measures costs $50 to $300. The real expense often comes from repairing the damage squirrels leave behind:
- Attic cleaning: $150 to $1,000
- Roof repair: $150 to $1,000
- Electrical rewiring: $2 to $4 per square foot
- Drywall repair: $300 to $900
For a straightforward case caught early (one or two squirrels, minimal damage, one entry point), you might spend $400 to $600 total. A long-established colony with chewed wiring and contaminated insulation can push costs well past $2,000. The sounds in your attic are worth investigating sooner rather than later, because every week of delay adds to the repair bill.