8 Signs of a Mouse Infestation in Your Home

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8 Signs of a Mouse Infestation in Your Home

At Willis Pest Control, we know how worrying it can be when you suspect a mouse infestation. Not only are mice unhygienic to have around the home, they can cause serious structural damage to your property and may even be a fire risk. That’s why it’s so important to act quickly if you see signs of a mouse infestation.

However, it’s not always easy to tell if mice have entered your home uninvited. To help you deal with your mouse problem effectively, we’ve put together this guide to the signs of a mouse infestations, as well as tips on what to do if you discover an issue. 

Signs of a mouse infestation

If you’ve been wondering ‘do I have mice?’, there are 8 key mouse infestation signs to look out for. 


How do you know if you have mice? Droppings are the first sign that rodents have entered your home. Mouse droppings are typically small and pointed at both ends. New droppings tend to be shiny, which indicates that mice are active inside your space. Keep an eye our for large amounts of droppings, as this could indicate a larger infestation. 

Mouse Dropping

2.Unexplained noises

Another sign of a mouse infestation is unexplained noise, especially at night. Like all rodents, mice are nocturnal and most of their activity will happen when the sun goes down. Keep an ear out for scratching and scurrying sounds. It may also help you pinpoint where the mice are located in your home. 

3.Unusual odours

Unfortunately, mice will defecate and urinate in your home if you have an infestation. Larger infestations may result in an unpleasant odour around the areas the mice have nested. Look out for strong, musky smells (a little bit like ammonia) as another infestation indicator. 

Mouse Odours

4.Gnaw marks

Mice tend to gnaw holes to gain access to areas throughout your home. Look for mouseholes or gnaw marks in secluded areas for find out if you have a mouse problem. Bear in mind that mouseholes tend to be small and clear cut (whereas ratholes are larger with jagged edges).

Moue Gnaw Marks

5.Greasy marks or pillars

As rodents move around your home, they tend to leave greasy marks in their wake. Look for shiny marks low down on your walls as another sign of a mouse infestation. It’s also useful to look out for small piles of dirt (known as pillars), which are often located in areas the mice frequent. 

Mouse Greasy Marks

6.Tracks or footprints

Mice tend to inhabit the secluded areas of your home, like your loft or cellar. These areas can have a little more dust than others, which can make it easier to see tracks or footprints. If you want to, you could sprinkle flour around the suspected areas too.

Mouse Footprints


Of course, a very obvious sign of a mouse infestation is finding a nest. Mouse nests are made from paper, cardboard, string and other easily chewed items. You may find the nest in your loft, cellar or even in your cavity walls. 

Mouse Nests


If you’re wondering ‘how do you know if you have mice?’, a sure-fire sign of an infestation are sightings. However, don’t just rely on the humans in your home! Your pets may be able to identify rodents before you do. Keep an eye out for barking or scratching in a particular area.

Mouse Sightings

Where to check for mice

If you see a number of the signs of a mouse infestation but still aren’t sure, it may be useful to look in the typical areas mice nest. You may be able to find the mice or at least see signs of a nest if you do. 

These are common places you might find mice hiding:

  • Lofts
  • Eaves and roof spaces
  • Cellars
  • Kitchens and laundries
  • Cavity walls
  • Sheds and garages
  • Outbuildings
  • Compost bins

It’s important to remember that a mouse infestation isn’t a sign your home is dirty or unclean. Mice search out spaces that give them a warm, comfortable and safe place to nest, as well as a home that gives them easy access to food. 

If there are mice around your property, they have no qualms about chewing through wood or other materials to get inside your space. 

What to do if you have mice

If you’ve seen the signs of a mouse infestation around your home, it’s important to act quickly. Mice can breed in vast numbers and, if your infestation is left untreated, your mouse problem could become much bigger. 

Mice are also very unhygienic to have around the home. From spreading germs to defecating, mice can be a health hazard. They can also chew through electrical cables or water pipes, increasing the risk of real damage to your property. 

There are a number of actions you can take to get rid of mice. 

  • Set bait or traps

In some instances, it is possible to remove a mouse infestation yourself. There are a variety of different baits and traps available to buy, and these may help to get rid of small infestations. However, it’s worth remembering that a do-it-yourself removal method may not tackle the problem entirely. You could find that the mice return if your pest control is ineffective.

  • Call a pest control expert

Usually, the best course of action is to contact a professional pest control company. They’re experienced in removing mice from homes and ensure that the problem is completely dealt with. In fact, good quality pest control experts (like us!) guarantee removal and will return as many times as necessary to ensure your home is rodent-free. Professional pest removers do their job efficiently and humanely, ensuring the best possible mouse removal. 

Pest control companies can also advise on how to prevent future mouse infestations. They’ll be able to identify entry points and problem areas to help rodent-proof your home from future pests. 

They may also be able to advise on disinfectant treatments to ensure your home is safe and hygienic after the mice have been removed. 

Let’s summarise…

It’s not always easy to know if you have mice in your home. They key to spotting the signs of a mouse infestation is to follow the indicators we’ve mentioned above. Remember that you don’t need to have all the signs for there to be a rodent in your home. If you’re unsure, call a professional pest control company in to inspect your property. They’ll be able to advise you on what to do next.

If you’re located in the West Midlands, our fully accredited team are on hand to help. Call us on 0121 588 5258 or 07305 518033 to talk about your mouse infestation and we’ll visit your property to deal with your mouse problem quickly and efficiently.

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