It usually starts at night — a faint scratching or scurrying sound inside the wall, sometimes in the ceiling. You listen, trying to convince yourself it might be a pipe. Then you hear it again. This is one of the most common calls we receive from Henrico County homeowners, and the cause is almost always the same: rodents in the wall void or the space above the ceiling.
The good news is that what you hear tells you quite a bit about what you are dealing with and where it is happening — before anyone opens a wall or enters the attic.
What the Sound Characteristics Tell You
Light, rapid scratching in the lower walls
This pattern — quick, light scratching that sounds like it is moving along the inside of the wall — is the most common sound associated with house mice. Mice are small (half an ounce), fast movers, and their claws produce a distinct light scratching as they move along studs and wiring inside the wall void. If the scratching is primarily at night, starts and stops quickly, and seems to come from multiple locations in the wall, mice are the most likely explanation.
Heavier thumping or rolling overhead
If the noise is overhead — in the ceiling or attic — and sounds heavier than you would expect from a mouse, this is consistent with roof rats. Roof rats are significantly heavier than mice, and their movement in the attic is audible as a heavier thump or rolling sound. In Henrico County, roof rat activity is most documented in the wooded western areas — Short Pump, Wyndham, parts of Glen Allen — where homes sit adjacent to mature tree canopy. If you have large trees overhanging the roofline, roof rats are a genuine possibility.
Low-frequency sounds near the foundation or crawl space
Ground-level sounds from beneath the floor — particularly if your home has a crawl space foundation — are consistent with Norway rats. Norway rats are ground-level burrowers and are most common in Henrico neighborhoods adjacent to drainage corridors, creek banks, and commercial areas. Their movement in the crawl space or beneath the subfloor can be heard as heavier scratching at floor level rather than in the walls.
When Are the Sounds Happening?
Rodents are primarily nocturnal. The classic pattern is scratching that starts shortly after the house goes quiet at night and stops before daylight. If you are hearing sounds during the day as well, it suggests a larger population — a colony that has grown enough that some individuals are active during daylight hours when the nocturnal shift is already over.
Sounds that are happening during the day in a home that had no daytime activity a week ago is a sign the problem is actively getting worse. That is a reason to act promptly.
Where to Look for Confirmation
Sound localization is useful but imperfect — sound travels in wall voids and can seem to come from a different location than the animal actually is. Droppings are the more reliable confirmation. In the morning, check the areas below where you heard the noise: the base of the wall, inside cabinet toe kicks, behind appliances, in the pantry. Mouse droppings are small (1/4 inch), dark, and pointed. Rat droppings are larger (1/2 to 3/4 inch) and blunt-ended.
Also check the attic hatch area if you heard overhead sounds. A quick look with a flashlight — without disturbing the space — can often confirm or rule out attic activity.
Why You Cannot Solve This with Traps Alone
Rodents inside a wall void are using an entry point from outside. Trapping the animals currently inside the wall does not close that entry point. As long as the opening exists, the outdoor population — which in Henrico County builds substantially through summer — can continue to enter. You can run traps indefinitely and the catch rate will decline, but the problem will reestablish within one to two seasons.
The right approach is to confirm the species with an inspection, identify and seal the entry point or points, and then treat the interior population. Done in that order, the problem does not come back.
What to Do Right Now
If you are hearing scratching at night and have not yet seen droppings or a live animal, you are likely in the early to middle stage of an infestation. This is the best time to act — the population inside is smaller and the entry points have not yet been widened by repeated use.
Call us at (804) 606-1376. We are available 5:00 AM to 11:00 PM ET every day. Describe what you are hearing and where — it helps us prepare for the inspection.
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