National Wildlife Control

Operators Association


Bats in homes causing concern usually fall into three types:

1. Random Bat

 Random bats can be bats that enter through open doors, windows, garage doors, etc. This type of entry is impossible to protect against and most often occurs during the month of August when young bats start flying but can happen year-round.

2. Non-Maternal Colonizing Bats

This situation is very common throughout the eastern region of the United States and occurs year-round, but most commonly during the months of October through February. Typically composed of male bats, this type of colony is generally a lesser number of bats than a maternal colony.

They become a problem to home owners when a roosting colony overwinters in attics and void areas of a home. A warm spell or a drop in temperature during this hibernation period will awaken bats to find a temperature zone to fit their needs resulting in bats in interior of home. This type of bat situation is ended through exclusion.

3. Maternal Colony 

This situation is a female grouping of bats using attic or voids as an area to give birth and raise young. This colonization is often the most extreme and becomes generational as female bats born in a structure can return to said structure to give birth.

During certain periods of this birthing cycle a “blackout” period will be followed. Blackout is the time period when bat pups have been born but are flightless. During this time frame bats cannot be evicted; however secondary work can be performed. This situation is ended through exclusion.


Bat exclusion is the process of ridding a structure of bats. Bats enter a structure through construction gaps and other areas common in the construction of our homes/structures. They are not rodents and do not gnaw into homes, but like a small rodent, can enter through gaps as small as 5/8 x 3/4-inch gap.