Signs You Have Mice (and What to Do About It)

As temperatures drop in the fall, mice and rats look for a warm place to nest — and Ontario homes are a prime target. A single mouse can lead to a full-blown infestation within a few months, since mice can produce a new litter roughly every three weeks. Catching the problem early makes all the difference.

Early Warning Signs

• Small, dark droppings near food storage, cupboards, or along baseboards
• Scratching or scurrying sounds in walls, ceilings, or under floors — especially at night
• Gnaw marks on food packaging, wires, or wood trim
• A musky, ammonia-like odour in enclosed spaces such as closets or under sinks
• Greasy smudge marks along walls where rodents repeatedly travel the same path

Why Rodents Are More Than a Nuisance

Mice and rats chew through electrical wiring, insulation, and drywall, which can create fire hazards and costly repairs. They also carry bacteria and parasites that can contaminate food surfaces and trigger allergies or asthma in sensitive household members. Once inside a wall cavity, they’re difficult to remove without professional-grade equipment and an understanding of their nesting behaviour.

How Professional Rodent Control Works

Effective rodent control starts with a full inspection to identify entry points — often gaps as small as a dime around pipes, vents, or foundation cracks. From there, a combination of exclusion (sealing entry points), targeted trapping, and monitoring ensures the current population is removed and new rodents can’t get back in.

Prevention Tips for Homeowners

• Store dry goods in airtight containers rather than original packaging
• Keep firewood and debris piles away from the exterior walls of your home
• Seal gaps around pipes, vents, and utility lines with steel wool or caulking
• Keep garbage and compost bins tightly sealed
• Trim vegetation and branches that touch the roofline

Rodent Control Near You

We help homeowners deal with mice and rats throughout Mount Albert, Keswick, Georgina, and Bolton. If you’re hearing noises in the walls or finding droppings in your kitchen, don’t wait for the problem to grow — visit our rodent control page to book an inspection.

For a property that sits empty in winter, use our cottage closing pest checklist. See the mice removal service for inspection, treatment and entry-point sealing.