The attic is where rodent problems hide

Nobody goes into their attic for fun. That’s exactly why rodents love it. A mouse or rat can live up there for months, building nests in the insulation and leaving droppings everywhere, before anyone notices.

Usually the first clue is a sound. Light running in the ceiling in the evening. Something that sounds like rolling or scratching right above the bedroom. Sometimes it’s a smell, or droppings near the attic hatch in a closet.

If something’s living in your attic, here’s what you need to know and how to fix it.

Signs you have rodents in the attic

Rats, mice, or squirrels? Who’s up there

Attic noises in Minneapolis can come from a few different animals:

• Mice are small and quick. Light, fast scratching mostly at night. Tiny droppings scattered across the insulation.
• Rats are heavier and louder, with bigger droppings. Norway rats are climbers when they need to be, and they’ll use trees, downspouts, and utility lines to get onto the roof.
• Squirrels are mostly active in the early morning and late afternoon, not in the middle of the night. They make heavier thumping and rolling noises and often chew bigger holes at the roofline.

If you think it’s squirrels, bats, or raccoons, you’ll need a wildlife service, which may be different from rodent control. The inspection will tell you what you’re actually dealing with.

How rodents get into an attic in winter

When it gets cold, warm air leaks up through your ceiling into the attic. Mice and rats can feel it. They climb up and in through:

• Gaps at the soffits and fascia, especially where the roof meets a wall
• Roof returns, a very common gap on Minneapolis homes
• Gable vents and roof vents without proper screening
• Plumbing vent pipes with gaps around the boot
• Inside the walls, coming up from the basement through wall voids

Freeze-thaw cycles and ice dams can open up new gaps along the roofline every winter.

Our attic rodent removal process

1. Full inspection. The tech inspects the attic, roofline, and the rest of the house to find the entry points and the extent of the damage.
2. Removal. Traps are set along runways in the attic. Bait, if used, goes in secured stations.
3. Seal the roofline. Gaps at soffits, roof returns, vents, and pipes are sealed with metal flashing, hardware cloth, and vent guards.
4. Cleanup and sanitizing. Droppings and nests are removed safely with protective equipment, and the area is treated with a disinfectant.
5. Insulation (if needed). Heavily contaminated insulation is removed and replaced.
6. Follow-up. Return visits confirm the attic is clear.

Do you have to replace the insulation?

Not always. If the activity was small and caught early, removing droppings and nests and sanitizing the area may be enough.

Insulation usually needs to be replaced when:

• It’s heavily soaked with urine or full of droppings
• There’s a strong odor that won’t go away
• It’s been flattened or tunneled so much it doesn’t insulate well anymore
• There were deer mice, which raises hantavirus concerns

In Minnesota winters, insulation matters. Damaged insulation means higher heating bills and more ice dams. Replacing it isn’t cheap, but it can pay off.

Can rodents in an attic make your family sick?

They can. Rodent droppings and urine can carry diseases, and when they dry out, the dust can get into the air. Deer mice can carry hantavirus, which is rare but serious. Attic air can also drift down into living spaces through gaps around lights and the attic hatch.

That’s why you should never go up and sweep or vacuum droppings in the attic yourself. Leave cleanup to someone with the right protective gear.

What attic rodent removal costs

Attic work covers a wide range: simple trapping and sealing can be a few hundred dollars, while full cleanup with insulation replacement can run several thousand. You’ll get a price after the inspection and before any work. See the full rodent control cost guide.

Attic rodent removal FAQs

How do I know if I have rodents in my attic?

Common signs include scratching or running noises above the ceiling at night, droppings near the attic hatch, tunnels or flattened paths in the insulation, chewed wires or ducts, nests in the corners near the eaves, and a musty smell drifting into the house.

How much does attic rodent removal cost?

It ranges widely. Basic trapping and sealing can be a few hundred dollars, while full attic cleanup and sanitizing is often $500 to $2,500, and insulation removal and replacement can be $2,000 to $6,000 or more. You’ll get an exact price after the inspection.

Do I have to replace the insulation?

Not always. Light activity can often be handled with cleanup and sanitizing. Replacement is usually recommended when insulation is heavily soiled, smells, has been badly tunneled, or when deer mice were involved because of hantavirus concerns.

What's the difference between rats, mice and squirrels in an attic?

Mice make light, quick sounds at night and leave tiny droppings. Rats are heavier, louder, and leave larger droppings. Squirrels are mostly active in the early morning and late afternoon and make thumping or rolling noises. The timing and droppings usually tell you which one it is.

How do rodents get into an attic in winter?

They follow warm air leaking up from the house and get in through gaps at soffits, roof returns, gable and roof vents, and around plumbing vents. Some climb up through wall voids from the basement. Ice dams and freeze-thaw cycles can open new gaps.

Can rodents in an attic make my family sick?

They can. Droppings and urine can carry disease, and dried droppings can become airborne dust. Deer mice can carry hantavirus. Don’t sweep or vacuum attic droppings yourself. Let a pro with protective equipment handle cleanup.

Why does the noise get worse in the evening?

Mice and rats are mostly nocturnal, so they become active after dark when the house quiets down. They come out of their nests to look for food and water. If the noise is mainly at dawn and dusk, it may be squirrels instead.

Attic rodent help near you

We connect homeowners in Minneapolis and nearby Edina, Bloomington, and St. Paul with local attic rodent technicians.

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.