If you hear scratching in the walls at dawn, you probably already know the answer. Squirrels move in through gaps you would not think they could fit, and once they are in, they are loud, messy, and expensive if you ignore them.
Here are the signs I look for, in roughly the order you are likely to notice them.
1. Scratching and scurrying sounds
This is usually the first one. Scratching, scurrying, or gnawing from the walls, attic, or ceiling, most active at dawn and dusk. Squirrels are daytime animals, so if the noise is at night, you are probably dealing with rats or raccoons instead.
2. Droppings
Squirrel droppings are small and oblong, a bit like a grain of rice. You will find them near entry points, in the attic, or along wall tops. They can carry bacteria, so wear gloves and a mask if you clean them up.
3. Chewed entry points
Squirrels chew through wood, vinyl, and even thin aluminum to make a hole. Look near rooflines, eaves, soffits, and fascia boards. A fresh hole shows light-colored wood; an old one is weathered.
4. Nesting material
Leaves, twigs, shredded insulation, paper, and fabric in your attic or walls are a dead giveaway. An active nest will have fresh material and a musky smell.
5. Grease marks and tracks
Squirrels leave dark, oily smudges along the routes they squeeze through. Check rooflines, rafters, and around entry points. In dusty spots you may also see paw prints.
6. Damage to wires and insulation
Chewed electrical wiring is a fire hazard, and squirrels shred insulation for nests. Check the attic for gnawed wires, torn insulation, and chew marks on beams.
7. Daytime sightings
Seeing a squirrel going in and out of your roofline during the day, especially carrying nesting material or food, is as close to proof as you will get.
8. Unusual odors
A musky, ammonia smell in the attic means accumulated urine. A dead squirrel in a wall smells different, strong, sweet, and putrid. Both need attention.
9. Garden damage
Dug-up bulbs, eaten fruit and vegetables, and raided bird feeders are squirrel work. Combine that with any of the signs above and they are probably living with you, not just visiting.
10. A second set of eyes
If you have several signs but cannot find the entry point, call a wildlife control operator. They know where to look and can confirm the size of the problem before it gets worse.
Frequently Asked Questions
Scratching and scurrying sounds from the attic or walls at dawn and dusk. Daytime noise in the walls is almost always squirrels.
Listen for scratching during daylight, look for chewed holes near the roofline, and check for droppings and grease marks around potential entry points.
Chewed wood and wiring, torn insulation, nesting material, droppings, and greasy smudges along their travel routes. Entry holes are usually about the size of a golf ball.
Yes. They chew beams, drywall, and electrical wiring, which is both a structural problem and a fire hazard. They also wreck insulation. The longer they stay, the bigger the bill.
About an inch and a half. That is smaller than most people realize, which is why the gap around a vent or a loose piece of fascia is all they need.
