How to get rid of rats and mice: signs, prevention and when to call a professional

Rats and mice rarely announce themselves directly — most households notice a problem through indirect signs well before actually seeing an animal, since both species are naturally cautious and tend to be active mostly at night. Knowing what to look for, what actually helps prevent an infestation, and when it's genuinely time to call a professional can save a lot of wasted effort.

The early signs are fairly consistent across both species. Droppings are usually the first thing people notice, often in a kitchen cupboard, along a skirting board, or in the loft. Gnaw marks on food packaging, skirting boards or even electrical cabling are another common sign, alongside greasy rub marks left along the same regular routes where rodents brush against a wall or surface repeatedly. Nesting material — shredded paper, fabric or insulation gathered into a rough nest — and rustling or scratching noises, particularly at night or coming from a loft or wall cavity, round out the most common indicators. Any one of these on its own isn't necessarily conclusive, but two or three together are usually a reliable sign that something is present.

Prevention is largely about removing what a rat or mouse actually needs to survive: food, water and shelter. In practice, that means keeping food in sealed containers rather than open packaging, using bins with properly fitted lids, not leaving pet food or water out overnight, keeping the garden reasonably tidy so there's less cover and fewer food sources outdoors, and sealing obvious entry points such as gaps under external doors or around pipework where they pass through a wall. None of this guarantees an infestation won't happen, but it meaningfully reduces the odds, and it's also the groundwork that makes any professional treatment more likely to actually stick rather than just address the animals currently present.

Once rodents are established, DIY traps or bait stations on their own often only reduce numbers temporarily rather than solving the underlying problem, mainly because they don't address how the animals are getting in or where they're nesting. A rat or mouse population that's found a reliable entry point and food source will generally be replaced from outside faster than a few traps can keep up with, which is why lasting removal typically needs proofing — physically sealing entry points — combined with proper inspection to find where the animals are actually coming from, not just where they're being seen.

This is where calling a BPCA-qualified pest control technician tends to make the real difference, since permanent removal is generally a combination of professional proofing and inspection rather than something that can be reliably achieved with shop-bought products alone. A competent technician will look for entry points that aren't obvious from inside the house, use bait or trapping appropriate to the situation, and follow up to confirm the problem has actually cleared rather than just quietened down. This matters beyond simple nuisance too — rodents carry pathogens including leptospirosis, salmonella and hantavirus, transmitted through droppings and urine that can contaminate food preparation surfaces, work surfaces and stored items, so an established infestation is a genuine health consideration and not just a matter of inconvenience.

If you're seeing early signs — the odd dropping, a gnawed corner of packaging, a noise in the loft at night — it's worth acting on prevention straight away rather than waiting to see if it resolves itself, since rodent populations can grow quickly once a reliable food source and entry point are established. If signs persist or multiply despite reasonable prevention efforts, that's generally the point to bring in a qualified professional rather than continuing with DIY measures alone.

It's also worth knowing roughly what distinguishes the two species, since it changes where you should focus your attention. Mice are considerably smaller and more agile, able to squeeze through gaps not much wider than a pencil, and tend to nest indoors close to a food source — behind kitchen units, inside wall cavities, or in loft insulation. Rats are larger, generally more cautious of new objects in their environment (which is one reason a trap or bait station that hasn't been disturbed for a few days doesn't necessarily mean rats aren't present), and are as likely to be coming and going from an outdoor burrow — often near a shed, decking, compost heap or drain — as living inside the house itself. Activity from both tends to pick up in the colder months, as animals that have been living outdoors move toward the warmth, shelter and steady food supply a house offers, which is part of why autumn and early winter is when many households first notice a problem that may, in some cases, have been building outdoors for longer.

Frequently asked questions