How to Find and Seal Mice Entry Points

No one wants to see a mouse in their house. If there is one there is likely to be more and that means you’re going to need a pest control expert to help you get rid of them. You can, and should, find out more about your local expert now before you need them.

Mice carry diseases, you can catch the disease by inadvertently touching their urine or faeces. It’s also possible for a mouse to bite you although this is rare. Alongside this, they are very good at chewing their way into things. They will attack your food and leave you with no choice but to throw it away. 

You can keep your house clean and tidy to help reduce its appeal to mice. But, the most effective way is to find and seal all mice entry points.

Cracks & Gaps

The easiest way for a mouse to get into your home is through a crack or gap in your wall. If you walk around your home you’ll find several small cracks where mice and other pests can enter. 

Don’t dismiss any crack because it appears small. A mouse can fit through a gap the size of a sixpence. It’s advisable to fill any crack you find. 

Pay particular attention around doors and windows. This is where cracks and gaps usually first appear. They are also easy targets for mice. 


Another common entry point for mice is the roof, according to CDC. You may have a missing tile or a slight gap at the top of the wall. This gives mice and other creatures an easy way into your home. All they need is an overhanging branch from a tree and they will easily climb up and in. 

The best way to avoid this is to check your roof and repair any damage. But, you also need to trim any trees that are near your home. They shouldn’t overhang and make it easy for pests to enter. Overhanging also means there is a greater risk of the branch breaking and damaging your house in a storm. 

From Inside

A crack in your wall may not be visible in the same spot inside your home. To find entry points inside your home it’s advisable to walk around your home and look for a collection of mouse poo. This indicates an arrival and departure point. It’s also possible that the crack or gap near this will have scratch marks around it. You’ll want to seal the gap up as quickly as possible.

You should note that mice and other rodents tend to run next to the wall. They will inadvertently leave a mark on the wall, allowing you to see where they are running back and forth. This can help you locate interior entry points and fill them.


Doors are supposed to be entry points but not for mice (more details). You should check that all your doors shut tightly. If there is a gap at the bottom fit a door brush. This improves the insulation of your home and keeps mice and other pests out.