Bats get into houses through surprisingly small openings, gaps as narrow as 3/8 of an inch, roughly the diameter of a dime. They don’t chew their way in like rodents. Instead, they exploit existing cracks, holes, and architectural gaps that most homeowners never notice. Understanding where and when bats enter makes it much easier to keep them out.
Common Entry Points Around Your Home
Bats are flexible enough to squeeze through a gap just 3/8 by 7/8 of an inch. That means almost any small opening in your home’s exterior is a potential door. The most common entry points include gaps where the roofline meets the walls (soffits and fascia boards), open or damaged ridge vents along the roof peak, loose or missing flashing around chimneys, and spaces where utility pipes or wires enter the house. Older homes with deteriorating mortar joints in brick walls are especially vulnerable.
Gable vents, attic fans without proper screening, and gaps beneath loose siding also invite bats inside. Once they’re in the attic or wall voids, they can work their way into living spaces through openings around light fixtures, ductwork, or unfinished gaps behind baseboards. A bat flying around your living room likely didn’t come through the front door. It found a route from the attic or walls into the interior.
Open windows and doors are the simplest entry point of all. If you leave unscreened windows open at dusk, a bat chasing insects near your porch light can fly right in. Garage doors left open after dark are another frequent culprit, especially in summer months when young bats are learning to fly and may have trouble navigating.
Why Summer and Fall Are Peak Seasons
Bat activity inside homes follows a seasonal pattern tied to their breeding cycle. Female bats form maternity colonies in warm, sheltered spaces like attics starting in mid-April. Pups are born hairless and completely dependent on their mothers, needing high temperatures to survive while the adults leave at night to feed. These pups can’t fly for several weeks after birth, so the colony stays put through the summer.
From June through August, young bats begin their first flights. This is when indoor sightings spike. Juveniles are clumsy fliers that often end up in rooms they didn’t intend to enter. They may come through open windows, miss their exit from an attic roost, or simply get lost navigating the structure. Closing unscreened windows and garage doors from dusk to dawn during these months significantly reduces the chance of a bat ending up in your bedroom.
Fall brings a second wave of activity. As temperatures drop, bats start searching for hibernation sites, and your warm house looks appealing. Single bats exploring potential winter roosts may slip inside through cracks they ignored during warmer months.
How to Get a Bat Out of Your Room
If a bat is flying around inside, stay calm. It’s far more scared of you than you are of it. Start by closing the door to contain the bat in one room and keep it away from children and pets, especially cats. If it’s evening, turn off the indoor lights and open windows or doors that lead outside. The bat will often navigate toward the fresh air on its own within minutes.
If the bat has landed on a wall or curtain and isn’t moving, you can capture it with a simple container method. Slowly place a shoebox or similar sturdy container over the bat, then slide a piece of cardboard underneath to seal the opening. Move slowly the entire time. Bats typically stay still when approached without sudden movements. Avoid using bath towels or loosely knit fabrics, because bat claws get tangled in the loops of the thread. A tightly woven cloth or a paper bag works better if you don’t have a container handy.
Once captured, take the bat outside and hold the container up high before opening it. Bats need to drop into the air to start flying, so releasing one at ground level doesn’t work well. Set it on an elevated surface like a fence or tree branch if it doesn’t fly away immediately. Never handle a bat with bare hands. Thick leather work gloves provide enough protection if you need to pick one up directly.
Why You Shouldn’t Ignore a Bat Visit
Less than 1% of bats in the wild carry rabies, but bat strains of the virus are responsible for the majority of human rabies deaths in the United States. The concern isn’t that every bat is dangerous. It’s that bat bites can be nearly invisible. Their teeth are tiny enough that a sleeping person, a young child, or someone who was intoxicated might not realize they were bitten. If you wake up and find a bat in your bedroom, or find one in a room with someone who couldn’t reliably report a bite, that’s treated as a potential exposure by public health authorities.
In that situation, try to safely contain the bat rather than releasing it so it can be tested. Contact your local animal control or health department for guidance on testing and whether post-exposure treatment is recommended.
Sealing Your Home Against Bats
Permanent exclusion means finding and sealing every gap 3/8 of an inch or larger on your home’s exterior. Inspect the roofline carefully, checking where soffits meet walls, around chimney flashing, at gable vents, and along ridge caps. Caulk small cracks, use hardware cloth or metal mesh over larger openings, and replace damaged vent screens. Pay attention to where different building materials meet, because expansion and contraction over the years create gaps that weren’t there when the house was built.
Timing matters enormously. Sealing entry points while a maternity colony is inside traps flightless pups in your attic, where they’ll die and create a much worse problem. Avoid any sealing work between May and mid-August. The safest window for exclusion is mid-August through April, after pups can fly but before the next maternity season begins. During the summer months, your job is simply to watch at dusk and identify which openings the bats are using so you know exactly where to focus your work later.
Professional exclusion typically involves installing one-way devices over the main entry points. These let bats leave at night but prevent them from re-entering. The devices stay in place for several days to ensure every bat has exited, and then the openings are permanently sealed. For a large colony or a complicated roofline, hiring a wildlife control professional is often worth the cost, since missing even one small gap means the bats will find their way back in.