Timing is the product
Best bat exclusion
The best bat exclusion device is a one-way cone or valve on the exit Bat (structure occupancy) already uses, installed only after pups can fly, then removed and replaced with hardware cloth once the roost is empty. Many US bats are protected. Sealing them in is a legal problem and a smell you will not forget. This is not a poison page and not a shop-vac page.
As an Amazon Associate, Pest Kill earns from qualifying purchases. Picks are editorial matches to a control sequence, not paid rankings or lab scores. Any pesticide must be used only as its EPA label allows. Advertising disclosure.
Best one-way exit: Bat cone one-way excluder. A cone or tube that lets bats out and not back in. Install it on the actual gap, leave it up for the number of nights the instructions and your local rule require, and watch for exits. Then seal.
Compare the picks
| Role | Tool | Best for | Type |
|---|---|---|---|
| Best one-way exit | Bat cone one-way excluder | A confirmed entry after pups can fly | Hardware |
| Best permanent seal | 1/4-inch galvanized hardware cloth | The gap after the colony is out | Hardware |
| Best way to find the gap | Headlamp or flashlight for inspections | A dusk watch | Hardware |
Which one to buy
Hardware
Bat cone one-way excluder
Best one-way exit — A cone or tube that lets bats out and not back in. Install it on the actual gap, leave it up for the number of nights the instructions and your local rule require, and watch for exits. Then seal.
Hardware
1/4-inch galvanized hardware cloth
Best permanent seal — Quarter-inch cloth or a proper vent cover, fastened. Do this the day you remove the cone, or another bat finds the same slot.
Hardware
Headlamp or flashlight for inspections
Best way to find the gap — Stand outside at dusk and mark where they stream. A cone on the wrong crack excludes nobody. Do not shine a light into a roost and crawl in.
The season matters more than the brand
Maternity season is when flightless pups are inside. A one-way door then traps them. Local wildlife agencies publish windows for exclusion. If you do not know the window where you live, do not install the cone this week. A bat on the floor of a bedroom may be sick. Do not handle it with bare hands. That is a public-health call, not a hardware call.
Common questions
What is the best way to get bats out of an attic?
A one-way exclusion device after pups can fly, then a permanent seal of that gap. Confirm the timing with your state wildlife agency. Do not seal the roost occupied.
Will ultrasonic repellers move a bat colony?
No. Use a properly timed one-way exit and then close the opening with metal or a vent that they cannot re-enter.
Can I use the same cone for squirrels?
The idea is similar and the hardware is not always the same shape. Use a bat cone on a bat gap. Squirrel doors are a different fitting. See the squirrel exclusion guide if the noise is daytime scrambling, not a dusk flight.