A faint scratching sound behind the kitchen units is easy to dismiss for a night or two. But mice rarely stay unnoticed for long. They can contaminate food, damage packaging and wiring, and move quickly through wall voids, cupboards and ceiling spaces. This guide to mouse control explains how to recognise the problem early, reduce the conditions that support it, and decide when it is time to call for professional help.

Guide to Mouse Control: Start With the Evidence

Mice are small, cautious and usually most active after dark. You may never see one in the open, particularly in a busy household or workplace. Instead, look for the clues they leave behind.

Fresh mouse droppings are dark, rice-shaped and usually found along skirting boards, behind appliances, inside cupboards or near stored food. Older droppings become dry and dull. A strong, stale urine smell in a contained area can also point to an established issue.

Other common signs include:

• Gnaw marks on food packets, cardboard, wood, plastic or electrical cables.
• Shredded paper, fabric, insulation or packaging gathered for nesting.
• Small greasy rub marks along walls and pipe runs where mice repeatedly travel.
• Scratching, scurrying or light movement sounds at night in walls, lofts or under floors.

One dropping does not always mean there is a large infestation. It may indicate a mouse passing through from a neighbouring property or an outside entry point. Repeated activity in several rooms, however, is a reason to act promptly. Mice breed quickly, so waiting for clearer proof often gives the problem time to grow.

When clearing droppings, do not sweep or vacuum them while dry. Ventilate the area where possible, wear disposable gloves, dampen the droppings with disinfectant, then lift them with paper towel and dispose of the waste in a sealed bag. Wash hands thoroughly afterwards.

Remove Food, Water and Shelter

Mouse control is not only about catching mice. It is about making the property less useful to them. A mouse can survive on very small amounts of food, including crumbs under a cooker, pet food left overnight or loose rubbish in a bin cupboard.

Store dry foods, cereals, flour, rice and pet food in hard containers with close-fitting lids. Wipe worktops after preparing food, clean beneath appliances when practical, and do not leave dirty dishes overnight. Kitchen bins should have lids and be emptied regularly, especially in shared houses, flats and commercial kitchens.

Water matters too. Repair dripping taps, do not leave pet bowls out overnight where this is avoidable, and check for moisture beneath sinks, behind washing machines and around boilers. In a workplace, staff kitchens and storage areas deserve the same attention as the main food preparation space.

Clutter creates protected nesting spots. Cardboard stacks, unused bags, stored textiles and crowded cupboards can make inspection difficult and give mice a quiet place to settle. You do not need an empty home or stockroom, but keeping stored items raised, orderly and away from walls makes signs easier to identify and clean.

Find and Seal Mouse Entry Points

Mice can squeeze through gaps that appear far too small to be a concern. A hole around 6 mm wide may be enough. For that reason, a quick glance around doors and windows is rarely sufficient.

Start in the kitchen, utility area, bathroom, loft and under-stairs cupboard. Check around pipes, cables, vents, drains, air bricks, damaged brickwork and gaps beneath external doors. Pay close attention to service penetrations behind kitchen units, as these are a frequent route into wall voids.

Small gaps can be sealed with suitable materials such as metal mesh, wire wool used with a durable sealant, or mortar for masonry defects. The right repair depends on the location. Expanding foam alone is not a reliable long-term answer because rodents can chew through it. Door brushes or threshold seals can help where a gap beneath an external door is the issue.

Do not block essential ventilation or cover air bricks without proper advice. Ventilation helps protect the building from damp, and an unsuitable repair can create a different problem. If you can see an opening but are unsure whether it is active or safe to close, a professional inspection is the sensible next step.

Use Traps Carefully and Check Them Often

For a small, recent problem, traps can be an effective part of mouse control. Traditional snap traps are generally more reliable than many novelty products, provided they are positioned correctly and checked regularly. Place them along walls, behind appliances or near visible signs, with the trigger end facing the wall where mice are likely to travel.

Use a small amount of bait rather than overloading the trap. Peanut butter, chocolate spread or a small piece of dried food can work well, although the best bait can vary. Avoid placing traps where children, pets or members of the public can access them. Tamper-resistant trap boxes offer safer placement in many homes and are particularly appropriate in commercial settings.

Glue boards should be avoided. They cause unnecessary suffering and create a difficult handling problem. Loose poison should also never be used casually. Rodenticides carry risks for children, pets and non-target wildlife, and a mouse that dies in a wall or ceiling void can leave an unpleasant odour. Professional treatments use controlled methods, correct placement and follow-up monitoring to reduce these risks.

If you set traps, inspect them daily. A trap left unchecked does not solve the hygiene issue, and catching one mouse does not prove the entry route has been dealt with. Continue looking for fresh droppings and new gnaw marks after activity appears to stop.

When DIY Mouse Control Is Not Enough

Professional support is particularly valuable when activity is ongoing, the source cannot be found, or mice are present in difficult areas such as suspended ceilings, wall cavities or beneath fixed kitchen units. It is also the right choice when there are children, pets, vulnerable residents or food safety responsibilities to consider.

For landlords and managing agents, a mouse issue can involve more than one flat, a shared refuse area or defects in the wider building. Treating one kitchen without checking adjoining routes may only move activity elsewhere. Businesses need an even more structured response, especially restaurants, shops, offices, warehouses and other premises where hygiene, reputation and compliance are at stake.

A proper professional visit should begin with an inspection. The aim is to identify signs of activity, likely entry points, food sources and harbourage, rather than simply place bait and leave. Treatment may involve trapping, secure baiting where appropriate, proofing recommendations and scheduled follow-up visits. The most effective plan depends on the property, the level of activity and whether the infestation is localised or established.

Golden Pest Control provides rapid mouse treatment for homes and businesses across London, including urgent situations where activity is causing immediate concern. Clear advice on preparation, treatment safety and prevention should always be part of the service.

Guide to Mouse Control for Commercial Premises

In commercial buildings, one missed cleaning routine or damaged service gap can affect more than one tenant or department. Facilities managers should make mouse prevention part of routine site care, not an emergency-only task. Keep refuse areas clean, maintain bin lids, inspect delivery points, and ensure food is not stored directly on the floor.

Staff reporting matters. A sighting, droppings near a kitchenette or damaged stock should be logged and acted on quickly, rather than treated as an isolated incident. Early reporting makes it easier to trace patterns and protect food, equipment and customer-facing areas.

For food businesses, avoid moving contaminated packaging or stock without assessing the area first. Segregate affected items, clean appropriately and seek professional advice where there is any concern about ongoing activity. A visible mouse problem can damage customer confidence quickly, but a controlled and documented response helps protect the business.

Act While the Signs Are Small

Mouse problems are easier to resolve before activity spreads through a property. Clean up food sources, inspect likely entry points and monitor the areas where you have found evidence. If droppings continue to appear, you hear regular noises, or you are unsure how to treat the issue safely, arrange an inspection rather than allowing a manageable problem to become a persistent one.