Once mice have been cleared, the aim is to stop a repeat. Prevention combines closing gaps, removing food and watching for early signs, and most of it is simple and low effort.
A young mouse can pass through a gap not much wider than a pencil. Walk round the outside of the house at ground level and look at where pipes, cables and vents go through the wall. Check the bottoms of doors, the corners of the garage and any damaged brickwork. A door that lets in a sliver of daylight will usually let in a mouse.
Doors deserve special attention, because they are the most used route. Look from outside at the gap along the bottom with the door closed and the light on inside. Garage doors, back doors and patio doors often wear unevenly over the years. A replacement seal or a metal kick plate is a small repair that can make a lasting difference.
Wire wool on its own can rust or be pulled out, so combine it with filler or sealant. Larger gaps may need metal mesh, which is hard for mice to chew through.
Mice rarely leave a home that feeds them. Keep dry foods such as flour, rice, pasta and pet biscuits in tins or hard plastic with tight lids, because cardboard and thin bags are simple to gnaw. Wipe crumbs from floors and worktops, and take out the bin before it overflows. In sheds and garages, avoid leaving bird seed or animal feed in open sacks.
Cluttered garages, boxes stacked against walls and overgrown vegetation around the foundation all give cover. Raise storage off the floor, keep a clear strip along the base of walls and cut back ivy that climbs onto the building. Compost heaps and wood piles close to the house can attract mice, so keep them at a distance where practical.
Mice tend to come indoors as the weather turns colder, so autumn is a good time for an annual check. Look in cupboards, loft corners and behind appliances for droppings. Catching one early is far easier than dealing with a colony. Businesses can set up regular monitoring visits through a service contract.
Inside the house, pipework is the next weak point. Kitchens and bathrooms usually have holes cut generously around pipes, then hidden behind units or boxing. Sealing those holes from the room side with a proper filler closes off the runs mice use between floors and between neighbouring houses.
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Closing the entry points. Food storage and tidiness help, but if mice can walk in through a gap they will keep trying. Sealing pipes, vents and door gaps stops most re-infestations before they begin.
A cat may catch some mice and deter others, but it will not ensure a mouse-free home. Many households with cats still have mice, particularly if there are gaps and a source of food.
A quick look in cupboards, the loft and behind appliances every few months is sensible, with an extra check in autumn. Early signs are small droppings and gnaw marks, which are easy to deal with if caught quickly.
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