How to Spot and Prevent a Mouse Infestation in Ottawa Homes

Mice are one of the most common pest issues we handle for Ottawa homeowners. Unlike seasonal pests such as wasps or ants, house mice are active year-round, and a small problem can quickly turn into an established infestation if it goes unnoticed. The good news is that the early signs of a mouse problem are usually easy to spot once you know what to look for.

Common signs of a mouse infestation

Most homeowners notice a mouse problem through indirect signs long before they ever see a live mouse. The most reliable indicators include:

• Droppings. Small, dark, rice-shaped droppings around baseboards, under sinks, inside cupboards, or along pantry shelves are a classic sign of mouse activity.
• Gnaw marks. Chewed food packaging, damaged wiring, or shredded paper and insulation all point to mice looking for food and nesting material.
• Night-time noises. Scratching, scurrying, or faint squeaking inside walls and ceilings — especially after dark — is often the first thing Ottawa homeowners notice.
• Nests. Mice build nests from shredded paper, fabric, and insulation in quiet, low-traffic areas such as storage rooms, behind appliances, or inside furniture.
• A musky smell. A persistent, slightly musty odour in a specific part of the home can indicate mouse urine and nesting material nearby.

Why mice come indoors

Mice are opportunists. They move indoors for three simple reasons: food, water, and shelter. Ottawa winters are long and cold, and a warm basement or attic is far more appealing than an exposed field or woodlot. Even homes that are kept clean can attract mice if there are accessible entry points, pet food left out overnight, or bird seed stored in the garage.

Once a single mouse finds a reliable food source, it usually is not long before others follow. Mice reproduce quickly, and a handful of mice in the fall can easily become a full infestation by mid-winter.

Prevention tips for Ottawa homes

Keeping mice out is almost always easier than evicting them once they are established. A few practical steps go a long way:

• Seal entry points. Mice can squeeze through any gap larger than about a quarter inch. Walk the exterior of your home and seal gaps around dryer vents, utility lines, foundation cracks, and garage door edges.
• Store food properly. Keep pantry staples, pet food, and bird seed in sealed, rodent-resistant containers — glass, metal, or heavy-duty plastic are all good options.
• Declutter storage areas. Basements, garages, and storage rooms give mice dozens of quiet places to nest. Keep items off the floor where possible and avoid long-term cardboard storage.
• Maintain the exterior. Trim shrubs and tree branches back from the house, clear leaf litter along the foundation, and keep firewood stacked well away from exterior walls.

When to call a professional

If you are seeing droppings in more than one area of the home, hearing regular night-time activity, or noticing gnaw damage to food packaging or wiring, it is worth getting a professional assessment. Our technicians can inspect the property, identify how mice are getting in, and put together a treatment and exclusion plan tailored to your home. Feel free to contact us to set up an inspection.

A mouse problem rarely resolves itself — but with the right combination of treatment and prevention, it can be handled quickly and kept from coming back. Pest Removal Experts has been helping Ottawa homeowners deal with mice for years, and we are always happy to answer questions about what you are seeing in your home.