If you’re hearing scratching, thumping, or scurrying on your roof, you almost certainly have a wildlife visitor. The most common culprits are squirrels, raccoons, birds, and bats, and the species determines how urgent the problem is, what damage to expect, and how to get the animal out safely. Here’s how to figure out what’s up there and what to do about it.
How to Identify the Animal
The fastest way to narrow down the species is by combining three clues: when you hear it, what it sounds like, and what evidence it leaves behind.
Time of day matters most. Squirrels are active during daylight hours, so scratching and scampering in the early morning or late afternoon points strongly to them. Raccoons, opossums, rats, and bats are nocturnal. If the noise starts after dark, you’re dealing with one of those. One exception: a nocturnal animal spotted during the day may have young to feed, or the local population may be unusually high.
Sound gives you more detail. Squirrels produce fast, light scurrying and gnawing sounds. Raccoons are much heavier, creating loud thumping and sometimes vocal growling, chittering, or crying. Rats and mice make quieter scratching and clawing noises inside walls or above ceilings. Bats are often nearly silent, though a large colony produces a faint collective rustling. If you hear distinct squeaks or cries, there may be young animals in a nest.
Droppings and damage round out the picture. Raccoon droppings are large and roughly dog-sized. Rat droppings are small, dark pellets. Bat guano accumulates in piles below roosting spots and has a distinctive musty smell. Discoloration on attic materials, visible under regular lighting, can indicate heavy urine from raccoons, flying squirrels, or a large bat colony. Under ultraviolet light, rodent urine glows blue-white, though other materials can fluoresce too.
Check the Access Route
Walk the perimeter of your home and think like the animal. Are tree branches hanging over or near the roof? Do utility lines run close to the roofline? Could something have climbed a downspout, crawled up a chimney, or squeezed under a porch and found a gap into the attic? These clues help confirm the species. Skunks, for example, can’t jump from a tree onto a roof. Squirrels can, but they’re unlikely to wriggle in under a porch. Raccoons are excellent climbers and will use downspouts, nearby trees, or even textured siding to reach the roofline.
For bats, the entry point can be hard to spot. Standing outside at dusk or dawn and watching where bats enter or leave the building is the most reliable way to locate the hole.
Why You Shouldn’t Ignore It
An animal on your roof is often an animal working its way into your attic. Once inside, the damage escalates quickly. Squirrels and rats gnaw through insulation and electrical wiring, creating a fire risk. Raccoons tear apart ductwork, crush insulation with their weight, and leave large volumes of urine and feces. Birds nesting under the roofline can damage siding and clog vents.
The health risks are real, too. Bat droppings can harbor the fungus that causes histoplasmosis, a respiratory infection that starts with fever and cough and can become serious in people with weakened immune systems. Bats are also the most common source of rabies exposure in North America, transmitted through bites, scratches, or even mucous membrane contact. Accumulated bat guano can also carry bacteria that cause salmonellosis (diarrhea, vomiting, abdominal cramps) and yersiniosis (high fever, chills, swollen lymph nodes).
Raccoon feces carry their own parasite risks, and any animal nesting in your attic leaves behind dander, urine, and saliva that can trigger allergic reactions: nasal congestion, eye irritation, skin rashes, and in some cases coughing and wheezing. External parasites like fleas, ticks, and mites can also migrate from animal nests into your living spaces.
How to Get Animals Out Safely
The most humane and effective approach is exclusion rather than trapping. A one-way door, installed over the animal’s entry point, lets it leave on its own but blocks re-entry. The animal heads out to forage as usual, then discovers it can’t get back in. Once a professional confirms the animals are gone, the door is removed and the entry point is permanently sealed. This method works well for raccoons, squirrels, groundhogs, bats, and other common roof-dwellers.
Timing matters. If animals have young in a nest, sealing the entry point too early traps the babies inside, where they’ll die and create a much worse problem. Spring and early summer are peak nesting seasons for most species. A wildlife removal professional will check for young before installing exclusion devices.
Avoid chasing animals through the attic yourself. A cornered raccoon can be aggressive, bats should never be handled without thick gloves due to rabies risk, and disturbing a large accumulation of bat guano can release fungal spores into the air.
What Professional Removal Costs
Professional wildlife removal averages about $400, with most jobs falling between $198 and $636. The species makes a significant difference:
- Birds: $100 to $700, depending on species and colony size
- Squirrels: $200 to $600
- Raccoons: $400 to $600
- Bats: $230 to $700
- Rats and mice: $175 to $550
- Opossums: $250 to $500
The removal itself is often the cheaper part. Repairing the damage animals leave behind can add substantially to the bill. Replacing contaminated or destroyed insulation runs $1,000 to $2,500. Fixing chewed wiring costs $2 to $4 per square foot. Siding repair, common when animals have nested under the roofline, ranges from $350 to $1,400. If drywall needs to be cut open to access nests, that adds $300 to $900. The longer an animal occupies your attic, the more expensive the cleanup.
Preventing Animals From Coming Back
Once the animal is out and the entry point is sealed, a few straightforward measures keep the problem from recurring.
Trim trees back from the roof. Branches that overhang or come within 6 to 8 feet of the roofline give squirrels and raccoons an easy jump onto the roof. Cutting them back removes the most common access route.
Cap the chimney. A properly installed chimney cap prevents raccoons, birds, squirrels, and bats from entering through the flue. Stainless steel caps are the best long-term option. Galvanized steel caps, once common, rust and deteriorate over time. Never cover a chimney flue with hardware cloth alone. It rusts, catches snow, and can block the escape of carbon monoxide, forcing dangerous gases back into the house.
Seal gaps and vents. Inspect soffit vents, ridge vents, gable vents, and any gaps where roofing materials meet siding. Rats can squeeze through a hole the size of a quarter, and bats can fit through a gap as narrow as a pencil width. Use heavy-gauge galvanized screening or steel mesh over vents and openings.
Eliminate attractants. Secure garbage cans, don’t leave pet food outside, and pick up fallen fruit from trees near the house. Raccoons and opossums that find a reliable food source near your home are far more likely to explore the roof for nesting opportunities.