The holes are smaller, higher, or more hidden than you'd expect. Mice can squeeze through any gap about the diameter of a dime, and most homes have dozens of openings that qualify.
There’s nothing quite as maddening as hearing mice in your walls when you can’t find a single obvious entry point. But mice don’t need an obvious hole. They need a gap, and the gap doesn’t have to look like much.
A quarter-inch crack where the foundation meets the siding is enough. They might squeeze in where a gas line or electrical conduit enters the house. Or they might find some worn weatherstripping under the garage door that’s compressed unevenly and leaves a sliver of daylight at one end. These are the kinds of openings mice use, and they’re almost invisible during a casual inspection.
Mice are also climbers. They can scale rough-textured walls like brick, stone, stucco, and wood siding. That means the entry points aren’t limited to the ground level. You might have gaps where the roofline meets the soffit or deteriorated flashing around the chimney. That’s enough to let them in through the attic.
The other factor that’s easy to miss is that mice chew. If a gap is almost big enough, a mouse can enlarge it. That means foam insulation around a pipe, deteriorating caulk, or even the rubber seal on a garage door can be gnawed through within minutes. To seal entry points, you would need steel wool, copper mesh, or hardware cloth for a durable fix.
If you've already got mice inside and can't locate the access points,Mosquito Squad of Bergen Passaic's rodent control services could help. These include a professional inspection focused on finding the entry points homeowners miss. A technician examines the structure systematically from foundation to roofline. This lets them figure out how mice are getting in and come up with a plan accordingly.
