What's Making That Noise in Your Walls? Identifying Pests by Sound and Location

Mice produce light, fast scratching and skittering sounds, usually between 10 p.m. and 4 a.m. Their nails on drywall, wood, and insulation create quick rustling bursts rather than steady noise. You'll typically hear them low along baseboards, behind kitchen and bathroom cabinets, and around plumbing chases where insulation provides warmth. The sound is intermittent, often stopping if you tap the wall, then resuming a minute or two later. If the noise is heavier or includes audible gnawing, you're likely dealing with rats instead, which require different traps and a different exclusion approach.

Rats are heavier, slower, and noisier than mice. You'll hear deliberate dragging, persistent gnawing on wood or wire, and footsteps that carry through joists rather than skittering. Mice produce quick, light scratching that sounds delicate by comparison. Rats also tend to occupy lower spaces like basements, crawl spaces, and ceiling cavities, while mice favor wall voids near floor level. Time of day is similar, both are strictly nocturnal, but the weight and persistence of the sound is the clearest distinguishing trait. Rats almost always indicate a larger established colony.

Dawn thumping in the attic almost always means squirrels. They are diurnal and most active at sunrise as they leave the nest to forage, returning in bursts throughout the day. You'll often hear them rolling acorns or nuts across the attic floor, scampering between rafters, and occasionally chittering. Raccoons can produce similar sounds but tend to move at dusk and after dark, with much heavier, slower footsteps. If the noise is loud, fast, and concentrated around sunrise and sunset, squirrels are the most likely culprit and should be evicted before any sealing work.

Yes, both species cause significant attic damage when left in place. Squirrels compress and soil insulation, gnaw on wiring, and chew through fascia and soffit boards to enlarge entry points. Raccoons cause heavier structural damage, tearing apart insulation for nesting, contaminating large areas with droppings, and occasionally breaking through ceiling drywall. Female raccoons with kits are especially destructive. Both species also bring secondary pests, fleas, mites, and parasites, into the home. Prompt professional eviction followed by exclusion repairs is almost always less expensive than waiting through one nesting season.

No. Sealing entry holes while an animal is still inside is the single most expensive mistake homeowners make. Trapped raccoons, squirrels, and even rodents will tear through drywall, vents, soffits, and ceilings trying to escape, often causing more damage in one night than the original infestation caused in weeks. The correct sequence is always evict first, verify the cavity is empty using motion sensors or paper-test methods, and then seal. Professionals use one-way exit doors that allow animals out but not back in, which solves the timing problem cleanly.

Faint papery or rustling sounds inside studs and joists usually indicate carpenter ants or termites. Both insects tunnel through wood, and the sound, often only audible at night when the house is silent, comes from large numbers of workers moving through galleries or chewing fibrous material. Carpenter ants prefer moisture-damaged wood, while termites favor wood in contact with soil. Neither produces the obvious thumping or scratching of vertebrate pests, which is why these sounds are frequently mistaken for the house settling. If you hear it consistently in the same wall, schedule a wood-destroying-insect inspection.

Call a professional any time you suspect wildlife rather than rodents, when you hear gnawing or wire damage, or when DIY trapping has not stopped the noise after two weeks. Raccoons and squirrels almost always require professional handling because of legal protections, biohazard risk, and the need for proper exclusion sequencing. Rats also warrant a professional when populations are established, because surface-level trapping rarely resolves the colony. A professional inspection identifies the species, locates entry points, and stages the eviction and repair work in the correct order so the noise stops permanently.