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Mice In The Kitchen
Droppings behind the toaster, gnawed food packets, and a scratching noise behind the kickboards at night.
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What's happening?
House mice live differently from rats, which is why the same approach does not work. A mouse needs a gap of about six millimetres, drinks very little water, and gets almost all its moisture from food — so it can live indefinitely inside a kitchen unit run, behind an appliance, or in the void under a floor, without ever going outside. They nibble constantly rather than eating one meal, leaving droppings across worktops, drawers and cupboards, and they urinate as they travel. That combination is a food hygiene problem more than a structural one. It also means the population is usually inside the building envelope: proofing the exterior alone does not solve it, and treatment has to reach the harbourage behind the units.
What usually causes it?
- Gaps around pipework, cable entries and waste pipes under the sink and behind appliances
- Open voids behind kickboards and between kitchen units connecting to the floor void
- Air bricks, missing mortar, or gaps where an extension meets the original wall
- Cavity walls and suspended floors giving a route from outside straight into the kitchen run
- Dry goods stored in bags and cardboard rather than sealed containers
- Crumbs and spills under and behind the cooker, fridge and units where nobody cleans
- Pet food, bird seed or compost stored in a garage or utility that adjoins the kitchen
Is it dangerous?
Mice contaminate food and surfaces with droppings and urine, and can carry organisms that cause food poisoning, so this is a real hygiene risk rather than a nuisance. They also gnaw, including cable, though less destructively than rats. The practical hazards are handling and products: clean droppings wet and gloved rather than dry-sweeping or vacuuming, wash hands afterwards, and keep any bait entirely inaccessible to children and pets — which is exactly why professionals use tamper-resistant boxes.
Can I fix it myself?
The prevention, largely — and with mice it does most of the work. Move appliances out and clean behind and under them, decant dry goods into hard sealed containers, fix drips under the sink, and block gaps around pipe entries with wire wool set in filler or a proprietary proofing product rather than expanding foam, which mice chew straight through. Break-back traps used correctly are legitimate in your own home and must be checked daily. Do not scatter loose bait or grain, and do not vacuum droppings without protection.
When should you call a pest controller?
Call a pest controller when droppings keep appearing after a fortnight of proofing and trapping, when you are in a flat or terrace where the population is clearly shared with neighbours, or when the harbourage is behind fitted units and inaccessible. In a rented home, report it to your landlord in writing — and note the council's environmental health team has powers where the source is a neighbouring property or a communal area. Persistent activity in a food preparation area is not something to keep living with.
What will the pest controller actually do?
- Identify species and mapping the runs from droppings, smear marks and gnaw damage
- Inspect behind and beneath kitchen units, appliances, floor voids and service penetrations
- Place traps and, where justified, professional-use rodenticide in tamper-resistant boxes away from food surfaces
- Proof gaps around pipework, cable entries, kickboards and air bricks with materials mice cannot gnaw
- Advise on the hygiene and storage changes that decide whether the treatment holds
- Return to monitor, and identify shared harbourage in a flat or terrace needing a wider treatment
Frequently asked questions
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