Expert warning as wood mice head into homes this winter

The British Pest Control Association (BPCA) warned that a cold start to 2026 could drive wood mice indoors in search of warmth and food, and that homeowners should be on alert.

The BPCA advised that while wood mice generally prefer to stay outside, they can become a problem when temperatures drop, as they do not hibernate and will look for shelter indoors.

Niall Gallagher, technical manager at the BPCA, said: “Wood mice are happiest outdoors, but they don’t hibernate during the winter, so when temperatures drop, they will seek warmth and food indoors.

“Prevention is always better than cure, so plugging any gaps around cable and pipe entry points, or doors and windows, is a key first step, alongside making sure bins are securely closed at all times.

“Food spills or crumbs should be cleared away immediately, and food needs to be stored securely to avoid encouraging mice inside.”

Signs of mice in the home include small, dark droppings, gnaw marks on food packaging, and the sound of scratching or scurrying in walls or ceilings, especially at night.

Mr Gallagher said: “If wood mice have settled in your home, it’s really important to take action quickly.

“They can contaminate food and surfaces and will shed dander and hair, which can trigger allergic reactions.

“Mouse droppings in food storage areas bring a risk of salmonella, while wood mice can also carry the bacterial infection leptospirosis, along with fleas, ticks, and mites that can be transferred to people and pets.”

He advised that it is important to correctly identify the type of mouse before taking any action, as it is illegal to use rodenticides to control wood mice.

Mr Gallagher said: “Mouse activity at this time of year should be monitored by someone who can accurately identify the species.

“It is illegal to control wood mice using anticoagulants or rodenticides, which are not approved for that species.”

BPCA member companies can offer compliant, non-toxic methods of control.

To find out more, visit: bpca.org.uk/find.