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Mouse & Rat Control

How to Keep Mice Away for Good

Mice are resourceful, persistent, and far smaller than most people expect, which is why keeping them out of your home takes more than a few traps scattered around the kitchen floor. This guide walks you through every layer of a genuinely effective mouse prevention strategy.

Understand why mice come in before you try to keep them out

A mouse needs three things: somewhere warm to shelter, something to eat, and a way to get inside. Fix any one of those and you make your home less attractive. Fix all three and you make it genuinely difficult for mice to settle. Most failed prevention attempts focus only on one layer, usually food storage, while leaving structural gaps and harborage sites untouched.

Mice can squeeze through a gap roughly the size of a ballpoint pen, around six millimetres. That is smaller than a five-pence piece. Before you invest in any deterrent, walk the perimeter of your home at ground level and look for gaps around pipes, airbricks, cable runs, weep holes in brickwork, and the points where utility services enter. Do the same indoors along skirting boards, under kitchen units, and behind appliances.

Seal entry points properly

Blocking gaps is the single most effective step you can take. The material matters enormously. Mice chew through soft filler, foam sealant, and wood without much effort. Use wire wool combined with a hard-setting filler or caulk for small gaps, and steel mesh or a metal kick plate for larger openings. Pay particular attention to:

  • The gaps around incoming water pipes and waste pipes under sinks and behind washing machines
  • Air bricks, which should have a mesh insert with openings no larger than six millimetres
  • The gap between the bottom of your front and back doors and the threshold, which is often wider than it looks
  • Where the floor meets the wall in older properties, particularly if floorboards have shrunk over time
  • Gaps around loft hatches, boiler flues and extractor fan outlets

If you are not sure whether a gap is large enough to be a concern, it almost certainly is. When in doubt, seal it.

Remove what attracts mice in the first place

Even a well-sealed building will face repeated pressure from mice if the outside or inside offers easy food and shelter. Think of this as reducing the incentive for mice to try in the first place.

Food storage: Transfer dry goods, including pet food and bird seed, into airtight containers made from glass, metal or hard plastic. Cardboard and standard plastic bags offer no real barrier. Keep worktops clear overnight, clean up crumbs after every meal, and make sure your bin has a close-fitting lid.

Garden and outdoor areas: Compost heaps, bird feeders and wood piles close to the house are three of the most common reasons mice appear in residential gardens. Move log stores and compost bins as far from the house as practical. If you feed birds, use a feeder with a tray to catch fallen seed rather than letting it accumulate on the ground.

Clutter and harborage: Mice nest in undisturbed areas, so stacked cardboard boxes, piles of old clothing and forgotten storage corners in garages and lofts are prime nesting sites. Keeping these areas tidy and storing items in sealed plastic boxes rather than cardboard significantly reduces the appeal.

Natural deterrents such as peppermint oil are sometimes suggested, but the evidence for their lasting effectiveness is limited. They may discourage mice from a small, enclosed area for a short time, but they will not stop a determined mouse that has found a warm home with available food.

When prevention is not enough

If you are already seeing droppings, hearing scratching, or finding damage to food packaging or wiring, the mouse population in or around your home has grown beyond the point where prevention alone will resolve it. At that stage, you need to deal with the active infestation before your prevention measures will hold.

Mice reproduce quickly, and a small problem can become a much larger one faster than most people expect. Waiting to see whether it resolves itself rarely works.

Our technicians are qualified and experienced in mouse control across residential and commercial properties throughout the UK. As a family run business, we are fully insured and every treatment comes with a clear written guarantee. We often have same day or next day appointments available, so you do not have to wait long to get the situation under control.

If you are concerned about health risks from mouse droppings or urine, avoid sweeping or vacuuming the affected area dry as this can disturb particles into the air. Wear gloves, dampen the area first with a disinfectant spray, and dispose of materials in a sealed bag. If anyone in your household develops symptoms such as fever, muscle aches or difficulty breathing after potential exposure, contact NHS 111 or your GP. In an emergency, call 999.

Frequently asked questions

How do I keep mice away from my house?
The most effective approach is to seal every gap larger than six millimetres around your home, remove accessible food sources, and reduce outdoor shelter such as log piles close to the building. Mice are persistent, so you need to address all three factors together rather than relying on just one measure such as traps or repellents.
What smells keep mice away?
Peppermint oil is the most commonly suggested natural deterrent, but its effectiveness is limited and short-lived in most real-world situations. Mice will typically ignore it once they have established a food source or nesting site, so smell-based deterrents work best as a supplement to proper sealing and food storage, not as a standalone solution.
Why do I keep getting mice even after setting traps?
Traps catch individual mice but do nothing to stop new ones entering, which is why infestations recur if entry points remain open. You need to identify and seal the gaps mice are using to get in, otherwise you are managing a symptom rather than solving the underlying problem.
Can mice get in through small gaps in walls?
Yes, mice can squeeze through a gap of roughly six millimetres, about the width of a pencil. Common entry points include gaps around pipes, cable runs, air bricks, and the joints between floors and skirting boards, especially in older properties where materials have settled or shrunk over time.
How do I stop mice getting into my kitchen?
Start by checking for gaps around the pipes under your sink, behind your washing machine, and at the back of built-in units, then seal any you find with wire wool packed into a hard-setting filler. Store all dry food, including pet food, in airtight containers, keep worktops clear overnight, and make sure your bin has a tight-fitting lid.
When should I call a pest controller for mice?
Call a pest controller if you are seeing droppings, hearing scratching in walls or ceilings, or finding damage to food packaging or wiring, as these signs suggest an established infestation that traps and prevention alone are unlikely to resolve quickly. A qualified technician can identify how mice are entering, treat the active infestation, and advise on long-term prevention.