Why winter changes pest behaviour
Colder weather affects where pests choose to spend their time. With less food available outdoors and a need for warmth, some species look towards buildings — particularly homes, outbuildings and commercial premises — for shelter. This doesn't mean pests suddenly become more common overall, but the ones that are around tend to move closer to people, which is when they're most often noticed.
Rats
Rats may move indoors during colder months, seeking warmth and shelter in lofts, wall cavities, sheds and outbuildings. Signs to watch for include droppings, gnaw marks, scratching sounds at night and shredded nesting material. If you suspect rats, see our rat control page.
Mice
Mice are well known for moving indoors as the weather turns, often into kitchens, lofts and utility spaces where food and warmth are available. Because they can squeeze through very small gaps, sealing entry points is one of the most effective ways to keep them out. See our mouse control page for signs and help.
Cockroaches
Cockroaches thrive in warm, humid spots such as kitchens, boiler cupboards and around heating systems — areas that stay favourable through winter. They're a particular concern in commercial food premises. See our cockroach control page if you suspect activity.
Other winter considerations
A few other pests can be more noticeable in winter:
- Cluster flies — sometimes gather in large numbers in lofts as they look for a place to overwinter
- Squirrels — occasionally take up residence in lofts during colder months
- Old wasp nests — these are usually dormant in winter, but the area may be worth checking in spring before wasps become active again
It's worth noting that not every winter pest problem needs the same response — identification matters before deciding what to do.
Reducing winter pest risks
A few practical steps taken before and during winter can help:
- Check and seal entry points before the cold sets in — see our rodent proofing page
- Keep food stored in sealed containers and clear crumbs and spills
- Manage waste — keep bins sealed, especially in cold spells when food is scarcer outdoors
- Declutter lofts, sheds and outbuildings to remove nesting spots
- Fix leaks and remove standing water
- Consider a prevention arrangement if your property or business is at higher risk — see pest prevention
When to request help
If you notice signs of pests indoors this winter, the earlier the problem is looked at, the easier it tends to be to resolve. You can submit an enquiry with details of the problem and your postcode, and it can be passed to a suitable local pest-control provider.