As nights get colder, mice start looking for a warm place to spend the winter — and your house is perfect. They don’t need an open door. A mouse fits through a hole the size of a dime, so the gaps you never notice are exactly the ones they use.
Here are the five ways in we see most often on real jobs, and what to look for at each one.
1. Around pipes and plumbing
Where water, gas, or drain lines pass through a wall, the hole cut for the pipe is often a little bigger than the pipe itself. Mice gnaw that gap wider and slip straight through — especially under kitchen and bathroom sinks, behind washing machines, and where pipes enter the basement. Look for gnaw marks around the pipe and droppings nearby.
2. Where cables and wires enter
The same story as pipes, for a different utility: cable, phone, and electrical lines enter through drilled holes that rarely get sealed tightly. Droppings where cables come through a wall are a classic sign mice are using that route. Check the outside wall where lines enter, and the inside wall directly behind it.
3. Gaps under doors and garage doors
A door that doesn’t sit flush, a worn threshold, or a garage door seal with a gap at the corners is an open invitation — mice follow the draft. Garages are a halfway house: once mice are in the garage, the door into the house, and the gaps around it, are the next step. If you can see daylight under a door, a mouse can get through it.
4. Cracks and gaps in the foundation and siding
Foundation cracks, gaps where siding meets the sill, and loose vent covers all count. Mice travel along the base of a house looking for exactly these weak spots, and fall is when they start pressing on them hardest — cold weather outside, warmth and food inside.
5. Through food and storage, once they’re in
This one is the giveaway that they’re already inside: a dog food bag chewed straight through, pantry boxes nibbled open, droppings in a cupboard. Mice follow food, so pet food left in its bag, birdseed in the garage, and open pantry goods are what keep them staying once they’ve found a way in. Sealed, hard containers for pet food and pantry staples take away the reason to stay.
What to do if you see the signs
Hearing scratching in the walls? Droppings in the pantry? A chewed bag or gnaw marks around a pipe? Don’t wait until it’s a full infestation — mice multiply fast, and the longer they’re in, the more damage they do to wiring, insulation, and stored food.
A quick walk around your home checking these five spots is a good start. If you find signs, or you’re not sure what you’re looking at, send us a photo — we’ll tell you honestly what it is and build a plan for your property, not a one-size-fits-all treatment. No cut corners.
Call R.J.’s: 617-842-5801
R.J.’s Integrated Pest Management — 288 Grove St., #366, Braintree, MA 02184
Serving the South Shore.
Dealing with rodents now? See how our Rodent Control service works — inspection, removal, and sealing the entry points so they stay out.