Signs of mice in the house
A mouse or two is common in Canadian homes, especially as it gets cold — and the first, cheapest moves (cutting off food and sealing entry points) are the same ones the pros start with.
tuneQue remarquez-vous?
Sélectionnez ce qui correspond et la liste ci-dessous se réordonne. Pas certain? Passez.
flag
Commencez ici
Set snap traps against the walls where you see droppings, baited with peanut butter, with the trigger facing the wall — mice run along edges, not across open floors. Several traps work better than one. Check and reset daily. This handles a handful of mice; if you're catching them for weeks, treat it as an infestation.
Classé selon des données de pannes réelles. L’ordre s’ajuste selon vos observations ci-dessus.
Causes probables, dans l’ordre à vérifier
Ordre typique affiché Pour débutant Faisable, avec soin Sécurité critique Appelez un pro
visibilityHow to find where they get in
- Walk the outside of the house at ground level with a flashlight, looking for gaps around pipe and cable penetrations, dryer and stove vents, the foundation, and where siding meets the sill.
- Remember the pencil test: if a pencil fits, a mouse can. Check under sinks and behind appliances inside, too.
- Look for grease-marked rub trails, droppings, or gnawing near a gap — that's an active entry point to seal first.
buildflashlight schedule30 min
handymanHow to fix it
Pack steel wool (or copper mesh) tightly into each gap and seal over it with caulk or expanding foam; mice can't chew through steel wool. Cover larger holes with hardware cloth or sheet metal. Combine with food removal and trapping.
- Store all food, including pet food and birdseed, in sealed hard containers, and clean up crumbs and spills promptly.
- Pack steel wool or copper mesh firmly into every gap you found, then seal over it with caulk or foam; use hardware cloth or sheet metal over larger openings.
- Set snap traps along the active walls, check daily, and clean any droppings using the safe (damp, gloved) method — never dry-sweeping.
schedule60 min savings$15–40
Steel wool / copper mesh (rodent exclusion)Coarse steel wool or copper mesh to pack into gaps before caulking Snap trapsClassic wood or plastic snap traps; several are better than one
warning Clean droppings the safe way — never drySweeping or vacuuming dry mouse droppings can aerosolize hantavirus particles from deer mice, which can cause serious respiratory illness. Always ventilate the space, dampen droppings and nesting with a disinfectant or 1:10 bleach solution, wait, then wipe up wearing gloves (and a mask in enclosed spaces). Bag the waste and wash your hands after.
verifiedPourquoi confier ceci à un pro
Ongoing activity after you've sealed and trapped, lots of droppings, or repeated returns mean an established infestation that a licensed pest professional should assess and treat, and confirm the entry points.
Vos notes accompagnent la demande — ce que vous avez vu, ce que vous avez éliminé, quand ça a commencé — pour que le pro arrive avec une longueur d’avance.
Pourquoi la liste est dans cet ordre
Nous ne classons pas seulement selon la probabilité. Nous classons comme le ferait un bon artisan honnête : éliminer d’abord les causes gratuites, sûres et courantes. C’est pourquoi les vérifications peu coûteuses passent avant les réparations chères — et pourquoi tout ce qui est dangereux reçoit un arrêt net plutôt qu’un encouragement. Cet ordre existe pour vous faire économiser, pas pour vous vendre quelque chose.