How to Get Rid of Mice in Your Walls

To get rid of mice in your walls, place traps where the walls meet the floor and near where you hear activity, find and seal the quarter-inch gaps mice use to get in, and remove food sources. You rarely need to open the wall, mice leave the voids to forage, which is where you catch them.

That faint scratching or squeaking inside the wall is one of the most unsettling sounds a homeowner can hear, and it almost always means mice. Wall voids are perfect mouse habitat: warm, hidden, and lined with routes to your kitchen and pantry. Getting rid of mice in your walls is very doable, but it takes more than a single trap. Here is how to do it properly.

Confirm the mice and locate the activity

Mice are nocturnal, so the telltale sign is noise at night: light scratching, scurrying, or faint squeaks inside the walls. Look for other evidence too: small dark droppings (about the size of a grain of rice) along baseboards and in cabinets, gnaw marks, and a musky odor. Pay attention to where the sounds concentrate, usually near the kitchen, since mice nest close to food.

You usually do not need to open the wall

Here is the reassuring part: mice do not stay sealed inside the wall. They leave the voids constantly to find food and water, traveling along the base of walls. That means you can catch them at floor level without cutting into drywall. Opening a wall is only necessary in unusual cases, such as a mouse that died inside and is causing an odor.

Set traps where mice travel

Place snap traps or multi-catch traps flush against the wall, where the wall meets the floor, in the areas you hear activity and near suspected entry points. Mice run along edges, not across open floors, so trap placement matters more than trap quantity. Bait with a small dab of peanut butter. Avoid poison inside walls: a mouse that dies in the void becomes an odor problem you cannot easily reach.

Find and seal the entry points

This is the step that ends the cycle. A house mouse fits through a gap about a quarter inch wide, so the openings are easy to miss:

• Gaps around pipes, cables, and utility lines entering the home
• Openings behind and beneath kitchen cabinets and appliances
• Gaps under exterior doors and around the garage
• Cracks in the foundation and around vents

Seal them with rodent-resistant materials such as steel wool packed into gaps and covered with sealant, or hardware cloth over larger openings. Mice can chew through foam and plastic, so the material matters. This is exactly what our rodent proofing service is built to do.

Remove what is attracting them

Mice stay where there is food. Store pantry items in sealed containers, clean up crumbs and pet food, and take out trash regularly. Removing the food supply makes your traps more effective and your home less appealing.

Clean up afterward

Once the mice are gone, clean and sanitize the areas they used. Droppings and urine are a health concern, and the U.S. Centers for Disease Control and Prevention advises against sweeping or vacuuming them dry (see the CDC’s rodent cleanup guidance). For heavier contamination in attics or crawl spaces, our attic and basement cleanup and decontamination services handle it safely.

What you can handle vs. when to call a specialist

A homeowner can often manage a small, early mouse problem with careful trapping and sealing. Call a specialist when the activity continues despite your efforts, when you cannot find how they are getting in, or when there are droppings in the attic or crawl space, signs the problem is larger than the walls.

We remove mice, seal the gaps they use, and clean up, across Torrance, Downey, Carson, and the surrounding area. Call (310) 294-8659 for a free inspection.