How to Get Rid of Mice in Attics
An attic that nobody visits is the best room in the house from a mouse's point of view. Here is why they nest up there, how to tell they have, and ten steps to clear them out and keep them out.
The attic is storage to you. It is a nursery to a mouse.
Most of us use the attic as a storage space we only visit when we need something. Leaving it undisturbed for long stretches is exactly what makes it attractive to mice, and a mouse infestation up there causes problems for the whole house.
A female mouse is pregnant for about three weeks and can mate again right after giving birth, so a couple of mice multiply quickly and become hard to catch. Mice also carry parasites: mites, fleas, and ticks ride in on them and spread through the house. Their droppings and urine contaminate insulation and anything stored near the nest. And they chew. Gnawed wiring is a fire risk, and gnawed rafters, ducts, and keepsakes are expensive to put right. Knowing how to get mice out of the attic, and how to keep them out, is worth the hour it takes to read this.
Why do mice nest in attics?
Four things an attic offers that the rest of the house does not.
Nobody goes up there
Most attics are storage. They are quiet and undisturbed for months at a time, with no predators and no obvious danger, which is exactly the environment a nesting mouse is looking for.
It is warm
Heat rises, so the attic is one of the warmest spaces in the house through a Texas winter. That shelter from the elements is what draws mice up in the first cold week of the year.
There are hiding places
Boxes, holiday decorations, and unused furniture create a cluttered space full of cover. Clutter makes mice feel protected and gives them endless sheltered spots to build a nest.
There is plenty to chew
Mice are not picky. Insulation and wiring in the walls, cardboard, stored clothing, and paper goods all serve as nest material or something to gnaw. A box of old papers is bedding and a meal in one.
How to get rid of mice in your attic
Work through these in order. The first confirms the problem, the middle ones remove what attracted the mice, and the last two remove the mice.
1. Confirm mice are in the attic
Mice are most active at night and do not stay in the attic all the time. Scurrying, rustling, thumping, or squeaking in the ceiling or walls after dark is the usual first sign. Up in the attic, look for gnaw marks on boxes and wiring, droppings, and urine stains on insulation. Droppings can be mistaken for seeds, so look closely. Gaps where the roof meets the wall, cracks around vents, and tunnels in the insulation are entry points and travel routes.
2. Remove and replace soiled insulation
Mice burrow into insulation because it is warm and hides them. Pulling out the contaminated sections and replacing them removes the nests, the droppings, and the urine left behind, and takes away the cover that made the attic attractive. Wet the material down with a disinfectant before you handle it so dust is not stirred up.
3. Trim vegetation back from the roof
Mice run up shrubs and tree limbs to reach the eaves. If a branch touches or overhangs the roof, trim it back several feet so there is no bridge from the yard to the roofline.
4. Keep the house clean
Crumbs and spills downstairs are the food supply for mice nesting upstairs. If a mouse can always smell food in the house, it assumes food is always nearby and stays.
5. Store food in sealed containers
Mice follow smells. Open bags and boxes in the pantry, or an attic used as overflow food storage, give them a reason to settle. Hard-sided containers with tight lids stop the smell at the source.
6. Rodent-proof every entry point
A mouse squeezes through a gap about a quarter inch wide, roughly the diameter of a pencil. Check that windows and doors fit tight, then look along corners, where the roof meets the wall, where the wall meets the floor, and around vents and soffits. Steel wool and caulk handle gaps under an inch; sheet metal, mortar, or hardware cloth for anything larger.
7. Clean out and declutter the attic
Removing the boxes and soft goods mice nest in takes away their cover and gets rid of anything already chewed or soiled. An open, organised attic is far less welcoming and much easier to inspect.
8. Take out the garbage regularly
Garbage draws rodents and scavengers looking for an easy meal. A bin that sits full for days is a standing invitation; emptying it nightly removes one more reason to stay.
9. Trap them
Set snap traps along the walls and runways where you found droppings, baited with a pea-sized dab of peanut butter. Cheese is the cartoon choice and goes rancid before it attracts anything. Poison baits are also sold for attics, and the trade-offs deserve a plain statement: a poisoned mouse usually dies inside a wall or ceiling void where it cannot be retrieved, and a pet or an owl that eats it can be poisoned in turn. If bait is used at all it belongs in a tamper-resistant station placed by someone who knows the runways.
10. Call a licensed professional
The most effective way to clear an attic is a technician who traps, removes, and then seals the house so the attic does not fill again. That is what our rodent control service covers, from the inspection to the exclusion work.
Mice in the attic rarely stay in the attic. If you are also hearing them lower down, our page on getting mice out of walls and ceilings picks up where this one leaves off.
What you get back when the mice are gone
Mice chew on anything, from keepsakes to electrical wiring. When they gnaw a cable the casing wears away and the bare conductor is exposed inside a space full of dry wood and insulation. That is how rodent damage starts attic fires, and it is the single best reason not to let an attic population settle in.
Droppings and urine are the second reason. House mice contaminate insulation and stored belongings, they can spread salmonella onto anything that later comes downstairs, and they bring fleas, ticks, and mites in with them. Hantavirus, which gets mentioned on a lot of pages like this one, is carried by deer mice in rural and wooded areas rather than by the house mice found in city attics, but the handling advice is the same either way: do not sweep or vacuum dry droppings. Wet them down with a disinfectant, let it sit, and wipe them up with gloves on. If you are not sure what you are looking at, our guide to mouse and rat droppings will tell you.
Once the attic is clear, the last question is whether it stays clear. Our page on how to know when all the mice are gone covers the signs to watch for over the following weeks.
Prevention helps. Exclusion finishes it.
A clean house, trimmed trees, and a decluttered attic make mice less likely. They do not close the gap under the soffit. Our rodent technicians remove what is in the attic and seal the way back in, for homes and commercial buildings alike.
Keep reading
How Do You Know When All the Mice Are Gone?
Droppings, damage, scratching, and smell. How to read the evidence and tell whether a mouse infestation is actually over.
Read articleRodentsHow Many Babies Do Mice Have?
A female mouse can have 3 to 14 pups at a time, up to ten times a year. Here is how fast mice breed and how to get ahead of it.
Read articleRodentsHow to Get Rid of Mice in Walls and Ceilings
What draws mice into wall and ceiling voids, the signs they are already there, and the methods that get them out.
Read articleGot a pest problem? Get a free quote today.
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