That noise in the wall isn’t your imagination

It usually starts quietly. A little scratch behind the headboard. A light tapping in the ceiling. Then one night it’s loud enough that you sit up in bed and just stare at the wall.

Hearing rodents in the walls is one of the most stressful pest problems, because you can’t see them, you don’t know how many there are, and you can’t exactly reach in and grab them. The good news is that it’s very solvable, and it usually doesn’t mean cutting big holes in your walls.

Why mice and rats end up inside walls

Wall voids are perfect for rodents. They’re dark, protected, insulated, and they connect the whole house. A mouse can travel from the basement to the second-floor ceiling without ever stepping into a room.

Rodents typically get into walls from:

• The basement sill plate, where the wood frame sits on the foundation. In older Minneapolis homes, gaps here are very common.
• Utility openings, like gaps around plumbing, gas lines, cable, and A/C lines.
• The garage, especially where an attached garage meets the house.
• The roofline, through soffits, gable vents, and roof returns.
• Plumbing and heating chases, which run straight up through the house.

Is it mice or rats? Listen to the sound

How we get rodents out of walls without opening them up

Here’s how the technician we connect you with typically handles it:

1. Trace the activity. They’ll listen, look for droppings and rub marks, and check the basement and attic to figure out the route rodents are taking through the walls.
2. Find the entry points. Usually at the sill plate, utility lines, or roofline.
3. Trap at access points. Traps go where the wall void opens up, like the basement ceiling, the attic, behind appliances, or at plumbing access panels. Rodents come out to find food and get caught.
4. Seal the entry points. Once activity drops, outside gaps are sealed so new rodents can’t get into the wall system.
5. Small access holes only if needed. If a rodent dies inside the wall or a nest needs removing, a tech can usually work through a small hole that’s easy to patch.

Can mice or rats chew through wiring and cause a fire?

Yes, and this is one reason not to wait. Rodent teeth never stop growing, so they chew constantly, and the plastic coating on electrical wires is an easy target. Chewed wires can short out or spark. Fire officials and insurance companies have long pointed to rodents as a cause of some house fires.

If you notice flickering lights, a burning smell, outlets that stopped working, or warm switch plates near where you hear rodents, call an electrician to check it out, along with dealing with the rodents.

Will they leave on their own?

Almost never. If they’re in your walls, they’ve found warmth, safety, and probably food nearby. In Minneapolis, especially from fall through spring, they have zero reason to leave. They’re more likely to nest and have babies.

The only way they “leave on their own” is by dying in the wall, which creates a whole new problem. See dead rodent removal and odor if that’s already happened.

Is it safe to sleep with noises in the walls?

Mice and rats in the walls won’t attack you in your sleep. They’re scared of people. So yes, you’re physically safe tonight.

But it’s still not something to live with for long. Rodents in the walls are contaminating insulation with droppings and urine, chewing on wiring, and multiplying. And honestly, losing sleep night after night isn’t good for anyone. Getting it handled gives you your nights back.

Common situations

Mice & rats in walls FAQs

What does it mean when I hear scratching in my walls at night?

Most often it means mice, or sometimes rats, are traveling or nesting inside the wall voids. They’re most active after dark. It can also be squirrels or other animals in some cases, especially if the noise is in the attic in the early morning.

How do I tell mice from rats from the sound?

Mice sound light and quick, with fast scratching that moves around a lot. Rats are heavier, slower, and louder, and you may hear gnawing. Squeaking points more toward mice. A tech can confirm by looking at droppings and gnaw marks.

How do mice get into walls?

Usually through gaps at the basement sill plate, around pipes and utility lines, from an attached garage, or through openings at the roofline. Once inside, wall voids connect the whole house, so they can travel from the basement to the attic.

Can mice or rats chew through wiring and cause a fire?

Yes. Rodents chew constantly, and wire insulation is an easy target. Chewed wires can short or spark and are a known cause of house fires. If you notice flickering lights, dead outlets, or a burning smell, have an electrician check it.

How do you get rodents out of a wall without opening it up?

By trapping where the wall voids open up, like the basement ceiling, attic, behind appliances, or plumbing access panels, and then sealing the outside entry points. Rodents come out to look for food and get caught. Only small, easy-to-patch holes are needed in rare cases.

Will they leave on their own?

Almost never. If they’ve found warmth, safety, and food, they’ll stay and breed. The only way they leave on their own is usually by dying inside the wall, which causes a bad odor. Professional removal and sealing is the reliable fix.

Is it safe to sleep in a house with noises in the walls?

Yes, you’re physically safe. Mice and rats avoid people. But it’s not something to ignore, because rodents in walls contaminate insulation, chew wiring, and multiply over time. Getting them out sooner is better for your home and your sleep.

Help with rodents in walls near you

Serving homes across Minneapolis plus nearby St. Louis Park, Richfield, and Edina.

Other rodent services

Norvane Rodent Control is a free referral service. Calls are connected to independent, licensed pest control providers serving the Twin Cities. We do not perform pest control services ourselves. Learn more.