Why Do I Keep Getting Mice?

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Does your home constantly get mice?

There can be a number of factors why your home seems like a mouse battlefield. First and foremost you must look at the bigger picture by looking outside your house or flat. Is there a property in close proximity that may not being lived in or even not being cared for? Is there construction works going on nearby? Do you live near food outlets? Is yours or your neighbours garden shed housing organic seeds or animal feed? If so, it ”could” be here where the problem lies.

A dominant male house mouse will have a territory of around 8-12m2. This chap could have up to 3 female mates who EACH can produce litters of upto 13 young within 3 weeks of mating. After a number of weeks from being born these mice will grow and start to be seen as somewhat of a threat to our dominant male. If there is an ample reliable food source the dominant male may tolerate having the kids around for a while, however this usually isn’t the case and the youngsters will likely get there marching orders. If the dominant male and/or reproducing females in THIS territory are NOT eradicated then the problem will continue with your home being infested by the offspring. If you can’t find the source, which we appreciate is quite difficult, then the next option for you is blocking the holes in and around your property where the mice are gaining entry.


Where do the mice enter from outside?

Once the young flee their original nest they will need to find a new home quickly which is safe, warm, sheltered and has a food source. They can squeeze under or over the tiniest of gaps so checking the external walls of your property is important. The most common entry points on the outer walls are:

  • through air vents
  • gaps around service outlets such as waste water pipework
  • gaps around gas pipework or electric cables.
  • under doors, including garage doors which in turn may lead to more entry points inside.

Outer Wall Entry Points ?


Air Bricks & Air Vents

This is the most common way we believe mice enter the average property. They are attracted to the radiating heat and smells of food through the vent. This open source will lead directly to the properties basement or under floor cavities. 

Gaps Around Services

Services such as waste water pipework, gas piping and electric cables allow opportunities for mice to enter your home. Quick DIY fixes to prevent this involve using wire wools or hardened adhesives with cement being the preferred choice.

Under Doors

Mice can squeeze under gaps such as doors that you can fit a pencil through. Draught excluders with stiff thicke bristles can be used, or excluders with metallic bristles gets the best results. Failing that a bevel edged stainless steel door threshold.

Where do the mice enter into the Living Area?

The Living area of the home we class as the space that is everything inside your internal walls that you can physically see and reach. The most common area where mice enter into the living area is the kitchen. This is where gaps have been left around the entering services such as water pipes and electric cables located under the kitchen units. Mice can also smell the foods in this area which they then make a beeline for. Common entry points are:

  • gaps around the water pipework entering the kitchen below the units
  • gaps around electrical cables entering the property. Either under stairs, under kitchen units, false walls behind kitchen appliances.
  • gaps around heating pipework such as radiator pipes.
  • fire places
  • gaps around boiler pipes
  • possible gap from the wall to the floor below the kitchen units.
  • gaps around the toilet waste pipe.
  • gaps around or under the bath panelling

Inside the Living Space Entry Points ?


Gap Around Incoming Pipes

This is the most common way we believe mice enter the living space is gaps around the entering service pipework such as water, heating or electrical services. They can also gnaw on cable insulation and the heating pipes lagging.

Gaps Around Radiator Pipe

Most properties with wooden floors that are not carpeted will likely have some gap around the incoming radiator pipes. Plugging with wire wool or installing pipe covers as shown are recommended. 


If you have a gas fire then then it is likely there are gaps around where the gas pipework runs into the cavity floor or false wall. Check in and around the fireplace for droppings to give you a better indication.

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