Mice in November: spotting the first signs at home

Cockroaches are our speciality, but November is also mouse season. As temperatures drop and the heating comes back on, the house mouse looks for a warm shelter and a food supply. Cellars, wall linings, suspended ceilings and the space under fitted kitchens offer both.

The trouble is that a mouse is discreet, nocturnal and small. In most of the homes we visit at this time of year, people first heard or found something before catching sight of the animal. Knowing how to read those early signs lets you act early, while things are still simple.

The signs to know

Noises

Scratching, light scurrying or rustling in partition walls, the ceiling or behind kitchen units, especially in the evening and at night, when the house is quiet. A noise that comes back every evening in the same place is worth checking.

Droppings

This is the most reliable sign. Mouse droppings are small, dark, elongated and pointed at the ends, roughly the size of a grain of rice. They turn up along walls, in drawers, behind appliances and at the back of cupboards. Shiny, soft droppings are recent; dry and dull, they are older.

Gnaw marks

Holes in packets (pasta, cereal, pet food), chewed corners of boxes, small shavings of wood or plastic at the foot of a skirting board. The marks are fine and paired, left by the two incisors.

Smell and nests

A sharp, ammonia-like smell in a closed cupboard or under a sink. A heap of shredded paper, fabric or insulation in a corner may be a nest.

Table: what to check and where

Mouse among leaves, looking for shelter

Checking for yourself, safely

• Dust a thin layer of flour along a suspect skirting board in the evening: footprints or tail marks in the morning confirm a route.
• Note where the droppings are, clean them up and come back two days later: new droppings in the same spot mean activity is ongoing.
• Clean carefully: wear gloves, dampen the droppings with a disinfectant before picking them up and never sweep them dry, so as not to raise dust. Wash your hands afterwards.
• Store food safely in rigid, closed containers: paper bags and thin plastic do not hold up.

Snap traps can help confirm a presence, placed against the wall on the suspected route. They do not replace a treatment if the signs keep multiplying.

Why not wait

A single mouse soon becomes a small colony: the species breeds quickly once it finds warmth and food. The earlier the visit, the shorter the treatment. Mice also gnaw cables and insulation, and their droppings contaminate food.

In apartment buildings, mice travel through ducts and voids just as cockroaches do. If several neighbours are affected, inform the managing agent: our article on cockroaches in apartment buildings describes the same approach to coordination.

What the technician does

The Repère Protocol applies to rodents too.

1. Locate: torch-in-hand inspection of routes, nests and entry points, in the home and its outbuildings (cellar, garage, loft).
2. Treat: rodent control with secure bait stations, closed and placed out of reach of children and pets, with mechanical trapping added where relevant.
3. Check: a follow-up visit built into the protocol, a reading of the stations and adjustments if activity remains.
4. Prevent: photo report, storage advice, sealing of the routes found once activity has dropped, active vigilance.

Calling in a technician

Targeted treatment for the house mouse is part of our rodent control service. The mouse guide describes its habits. Prices are public on the rates page and you can book a two-hour slot for your home or your business.

FAQ

How can you tell whether there is one mouse or several?

The number of droppings and how they are spread give an indication: droppings in several distant spots, of different sizes, or noises in several rooms suggest more than one animal. Only an inspection can really gauge the extent of the problem and locate the nests.

Are mouse droppings dangerous?

Rodent droppings and urine can carry pathogens and contaminate food. Avoid handling them bare-handed or sweeping them up dry. Wear gloves, dampen them with a disinfectant before picking them up, and throw away any food that has been opened or gnawed.

Why do mice mostly come indoors in autumn?

As temperatures drop, food becomes scarce outdoors and heated buildings become attractive. Mice then look for a winter shelter, and homes, cellars and business premises offer them warmth, hiding places and food supplies.