How to Keep Bats From Entering a House

Though bats can be of great help in keeping the mosquitoes around your house under control, you do not want them inside your home.

Bats can be a nuisance in the home.Bats can be a nuisance in the home.
Inside the home, bats can cause various problems and can even carry rabies. If you find that you have bats in the attic or other areas of your home, you will need to take a few precautions to secure your house and make sure that the bats stay out.

Search for small holes in your walls or windows where bats may be entering. There are often small holes near the attic area that bats can use to enter the home. Cover all attic windows and vents with screens. If you have a chimney where bats may be getting in, get a screen to cover the top of the chimney as well.

Use a bat repellent chemical. Naphthalene is the only chemical approved by U.S. law that can be used to repel bats. This chemical comes in crystal or flake form. Buy it online or from a pest control professional and sprinkle it along the floor of the attic.

Fix any damaged window screens. Examine the window screens around your home to make sure they are intact and do no have small holes. If you do find holes in any of your screens, replace them. Use caulk to seal any areas around windows that are have cracks or are not secure.

Watch the outside of your home around sunset to determine if there are still bats in your home. When the sun goes down, you will see the bats exiting your home. Watch where they are leaving from to quickly find and fix the hole they are using to get in and out.

Things You Will Need

  • Screens
  • Mothballs
  • Eucalyptus oil
  • Window caulk


  • The New Jersey Department of Health recommends that you wait to fix any holes until after sundown, when all bats have exited the home. This way you know you are not trapping bats inside.


  • Naphthalene is not a permanent solution for the removal of bats. Once the flakes melt away, the bats will no longer be repelled. This method should be used in conjunction bat-proofing your home.

About the Author

Jennifer Brister a freelance writer located in Northeast Louisiana. She has enjoyed careers as an educator, a nuclear lab technician and a massage therapist. Her writing can be found in several publications, including "The Circle," "Carbon Cotton Magazine" and "Fashion Advantage Magazine." She has been employed as a professional freelance writer for three years.