Although bats vary in size, the majority of them will require only the tiniest of holes in order to gain entrance to a building, usually the attic. They will be on the hunt for a roost — a place to call home while all of the females club together to give birth and rear pups, usually towards the beginning of spring. Bats either wake up from their hibernation at this time, or return from their migratory travels.



You will need to be on the lookout for holes that are super small — three-eighths of an inch. This kind of tiny hole can be found in many places, including:
Gaps in brickwork
Missing roof tiles
Tiles with raised features (and holes beneath them)
Mortar joints

Air gets sucked in or pushed out of these small cracks, and the bats use these air channels as ways to get in. When the temperature seems to rise quite quickly, bat-in-attic calls increase, giving you an idea of when to look. There is quite an easy way to find out how bats are getting inside your property and you just need to head outside after dark. It'll be about an hour after sunset that you'll sense the most activity, unless you wish to stay up until sunrise too, but when the nocturnal bats leave the building to find food, you'll see them flying around. You might even hear them flying around too.

By keeping your eyes open and watching the very fast flight paths of these animals, you can get a really good idea of where any potential entrance points are — it'll be where all the activity seems to be based. You can either investigate these points of entry immediately, or wait until it is daylight. Either way, you're going to want to pinpoint every hole, crack, or crevice that they seemed to be aiming for, and then further afield too. You should look out for any POTENTIAL entry points, as well as ones that have already been created. Other signs that you can look for, for bat activity, including guano — bat droppings. This will pile up around the areas that the bats use the most, so a buildup of the stuff at the bottom of an exterior wall would usually be a good sign that there has been some in-and-out bat activity directly above that spot. If you look up, there might be other signs, including stains left by the constant rubbing of bat fur against the walls.

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