Problem solver
Scratching in the walls: what’s making the noise?
The time of day, where the sound is, and what it sounds like can narrow down the culprit before anyone opens a wall.
Next steps
Check the exterior for entry points (see rodent entry points), look for droppings in the attic and under sinks, and arrange an inspection. If it might be yellowjackets in a wall void, don’t seal the hole. See wasp control.
Sound guide
| When | What you hear | Likely cause |
|---|---|---|
| Night | Light scratching, quick scurrying | House mice |
| Night | Heavier running, gnawing, in upper walls and ceiling | Roof rats |
| Dawn and dusk | Thumping, rolling sounds, in attic or upper walls | Squirrels (wildlife) |
| Any time | Faint rustling or clicking in a wall | Carpenter ants or yellowjackets in a void |
| Spring | Chirping or scratching in a chimney or vent | Birds or wildlife nesting |