How to Identify a Pest Problem in Your Home

Droppings & Physical Evidence

Droppings are often the clearest sign something's present, and their size and shape can help narrow down what you're dealing with — small, dark, pointed droppings usually point to mice, while larger, blunt-ended droppings suggest rats. Roach droppings look like small, dark specks or coffee grounds, often clustered near cracks or under appliances. Physical evidence like shed insect wings, egg casings, or discarded exoskeletons is worth noting too, even without seeing the pest itself.

Structural Damage

Some pests leave damage before you ever see them. Look for hollow-sounding or crumbling wood, small pinholes, or fine sawdust-like shavings near baseboards, window frames, or deck posts — signs commonly linked to wood-damaging pests like termites or carpenter ants. Chewed wiring, insulation, or gnaw marks on stored items point more toward rodents. Damage location matters: attics and crawl spaces are common starting points for wildlife and wood-destroying pests alike.

Sounds & Activity Patterns

Scratching or scurrying sounds in walls, ceilings, or attics — especially at night — often mean rodents or small wildlife have gotten in. Daytime sightings of pests that are normally nocturnal, like cockroaches, can be a sign the hidden population has already grown large enough to push some individuals out to forage during daylight. Pay attention to when and where you're noticing activity; the pattern itself is a useful clue.

Unusual Smells

A persistent musty odor can point to rodents or excess moisture drawing in moisture-loving pests like silverfish or centipedes. A stronger, more acrid smell sometimes accompanies larger rodent infestations. Stink bugs release a distinct odor when disturbed or crushed, which is its own giveaway. If a smell seems out of place and doesn't have an obvious source, it's worth mentioning when you call.

When to Call a Professional

A single ant or spider sighting usually isn't cause for concern, but recurring activity, physical damage, or multiple types of evidence together are good reasons to get a professional opinion rather than guess. If you're weighing whether to handle something yourself first, our DIY vs. professional treatment guide walks through how to make that call.