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Few things unsettle a kitchen quite like the sound of scratching behind the units at dusk. Mice are determined, quiet and remarkably good at squeezing through gaps you would swear were far too small. The encouraging part is that prevention is far simpler than most people imagine. It comes down to two things: the fabric of your building, and the way you store and handle food. A few focused hours of proofing and tidying can keep your kitchen mouse-free for years.

Why the Kitchen Is the First Room They Fancy

Mice need warmth, shelter and food, and a kitchen offers all three within a few metres. Wall cavities, gaps behind skirting boards and the warm space behind a fridge or oven make ideal harbourage, while crumbs, open cereal packets, pet bowls and a dripping tap provide easy living. Mice also have excellent spatial memory and will follow the same route along walls and pipework night after night, which is why activity tends to follow a pattern once they are in. Knowing that they almost always hug edges and follow services helps you predict where they will enter and how they will travel.

The single most useful fact to remember is this: a mouse needs a gap of only about 6mm — roughly the width of a pencil — to get through. A job that looks tidy and sealed to the eye can still be an open door to a determined rodent.

Find the Entry Points Before You Seal Anything

Spend an evening with a torch and a small mirror, checking the obvious and the overlooked:

• Under the sink, where waste and water pipes pass through the wall or floor.
• Boiler, gas and central heating pipework, especially where it disappears into a wall or ceiling.
• Gaps at the base of external doors, and the join between the wall and floor behind kitchen units.
• The service void behind and beneath cupboards, where plinths often hide an unsealed gap.
• Outside: cracked brickwork, gaps around drainpipes and soil pipes, eaves, and any adjoining garage or utility wall.

Follow pipe runs and cables outward as well as inward. Most infestations walk in from a shed, garage, compost heap or neighbouring property, so an hour spent outside is never wasted.

Sealing Gaps That Actually Stays Sealed

Mice gnaw through expanding foam and silicone with depressing ease, so the trick is to combine materials. Push grade 0 wire wool tightly into the gap, then cover it with a hard-setting filler, mortar or a proprietary sealant. The wool stops the gnawing and the filler holds it in place. For larger openings, a piece of galvanised mesh fixed over the hole works well.

Do not block air bricks, trickle vents or underfloor ventilation — good airflow prevents damp and rot, and mice dislike draughty, dry voids anyway. Instead, fit purpose-made air brick covers or mesh that keeps rodents out while letting air through. Fit brush or seal strips to the bottom of external doors, including the door between the kitchen and an integral garage, and check that letterboxes and cat flaps close properly.

Store Food So It Stops Being an Invitation

Mice will chew through cardboard, thin plastic and paper bags without hesitation. Decant dry goods into glass jars or tins with clip or screw lids — flour, rice, pasta, cereal, sugar and biscuits all deserve a container. Consider these other easy meals:

• Pet food and bird seed, which are often the richest food source in the house and are frequently left in a garage or shed.
• Fruit bowls, bread bins and any food left out overnight on the worktop.
• Kitchen caddies and wheelie bins — keep lids shut and rinse packaging that has held meat or dairy.
• Compost caddies, which should be emptied daily and lined properly.

It also helps to clear the cupboard floor of loose packets. A tidy, sealed store gives mice nothing to work with, and hungry mice move on.

Keep the Kitchen Dry, Tidy and Unwelcoming

Mice can survive on very little, but they do need water. Fix dripping taps and leaking pipework, and dry out any damp patches under the sink. Sweep or vacuum under the cooker, fridge and toaster regularly, and wipe down worktops and the floor at the end of the day; crumbs in the gap between units are a reliable food supply. Wash up rather than leaving dishes overnight, and take rubbish out before bed. Reducing clutter — cardboard boxes, bags and unused appliances stacked against walls — removes the sheltered runways they prefer.

Monitor and Act Early

Mice are creatures of habit, so catching them early is very achievable. Look along skirting boards, behind appliances and inside cupboards for:

• Dark droppings around 3–8mm long with pointed ends.
• Greasy smear marks along wall bases where fur has rubbed the surface.
• Gnaw marks on food packaging, cables or wood, and shredded paper or fabric used for nesting.
• Scratching or scuffling just after dusk or before dawn, and pets staring intently at a cupboard.

If you suspect activity, dust a thin layer of flour along a suspected route and check for tracks overnight. Snap traps set along walls and at right angles to them, baited with chocolate or peanut butter, are effective and humane when checked daily. Avoid poison in a kitchen used by children or pets, and think carefully about wildlife — poisoned mice are often caught by owls, cats and foxes. If activity continues after two or three weeks of proofing and trapping, or you find droppings in several rooms, bring in a qualified pest controller for a survey and a proper exclusion plan.