How To Get Rid of Bats in Your Attic

If you hear scratching noises in your attic or notice a strong, musty odor, you might have a bat infestation. Bats can squeeze through openings as small as ½ inch, making attics a prime roosting spot. While bats help control insect populations, they also pose serious health risks—their droppings (guano) can carry histoplasmosis, and they are the leading cause of rabies transmission in the U.S.

Removing bats isn’t as simple as setting a trap. Most states prohibit killing or poisoning bats, so homeowners must rely on humane exclusion methods. Depending on the infestation size, professional bat removal costs $400 to $1,500, with cleanup and repairs adding to the expense.

In this guide, I’ll walk you through safe, legal ways to get rid of bats, prevent their return, and protect your home from future infestations.

Strategies for Removing Bats in Your Attic 

If you have bats in your attic, removing them quickly and legally is crucial. Since poisoning or killing bats is illegal in most states, the best method is humane exclusion. Here’s how to do it safely:

• Install a bat excluder – These one-way doors let bats leave but block them from re-entering. Seal all other entry points first (bats can fit through holes as small as ½ inch). Place the excluder at a downward angle for easier exit. Once they’re gone, remove the device and seal the hole permanently.
• Hang bat netting – Secure netting over their exit point, leaving the bottom open. Bats will fly out but won’t be able to re-enter. Remove it after a few nights and seal the opening.
• Use sound deterrents – Ultrasonic bat alarms or white noise machines can make your attic an unpleasant place to roost. However, sound alone won’t keep bats away if entry points remain open.
• Apply natural repellents – Bats dislike strong peppermint and spearmint oils. Spray a mixture of water and essential oils near entry points and suspected roosting spots. (This is a temporary fix—not a long-term solution.)
• Eliminate food sources – If you have mosquito or spider problems, bats will stick around for the easy meal. Treating for these pests first can make your home less inviting.
• Repair entry points – Inspect your roof, vents, siding, and window screens for small gaps or holes. Seal any openings larger than ½ inch with caulk, mesh, or foam insulation to prevent re-entry.
• Dim outdoor lights – Bright exterior lighting attracts bugs, which in turn attract bats. Switch to yellow bug lights to reduce their food supply.
• Call a wildlife expert – If you have a large colony or baby bats, professional removal is the safest option. Baby bats (May–August) cannot fly, and trapping them inside can create bigger problems (like a terrible smell if they die in your walls).

⚠️ Important: If you suspect baby bats, wait until they are old enough to leave before sealing the attic. A professional can advise on the best timing.

How To Keep Bats Out of Your Attic 

Once you’ve removed bats, preventing their return is key. Bats can find their way back if entry points remain open or food sources are nearby. Here’s how to bat-proof your home:

• Seal All Entry Points – Bats only need a ½-inch gap to re-enter. Inspect your roof, attic vents, siding, and window screens. Use caulk, steel wool, or mesh to seal gaps and block potential entry points.
• Use Bat Deterrents – Fake owl decoys can scare bats away if placed high up near the roofline. Move them every few weeks to keep bats from catching on.
• Keep Doors & Windows Secure – Especially at night, when bats are active. Ensure window screens and attic vents are intact and free of tears.
• Switch to Yellow Bug Lights – Bright white lights attract insects, which attract bats. Yellow LED bug lights help reduce their food supply.
• Cover Chimneys & Vents – Bats love warm, sheltered spots like chimneys and furnace vents. Install wire mesh covers over these areas to keep them out.

Taking these steps will keep your attic bat-free and save you from another infestation down the road.

Signs You Have Bats in Your Attic  

Bats are nocturnal and prefer dark, quiet spaces, making attics an ideal roosting spot. Breeding season (April–June) is when bats are most likely to invade homes, as female bats seek shelter to raise their young.

🔍 Common Signs of a Bat Infestation:

• Strong, musty odors – Bat guano (droppings) has a sharp, ammonia-like smell.
• Chirping or squeaking sounds – Especially at dawn and dusk.
• Scratching noises – Bats crawling along attic surfaces.
• Seeing bats around your home – Frequent sightings at night.
• Bat droppings – Small, dark pellets accumulating near walls or entry points.
• Dead bats indoors – Finding one inside could indicate an infestation.

⚠️ Important: If you suspect baby bats, avoid sealing entry points until late summer—trapping them inside could cause deadly odors and bigger problems.

How Bats Get Inside Your Home

Bats can squeeze through openings as small as ½ inch, making it easy for them to invade attics and crawl spaces. Once inside, they roost in rafters, insulation, or behind walls.

🔍 Common Entry Points for Bats:

• Roof gaps – Cracks in shingles, vents, or soffits.
• Damaged screens – Tears in window or door screens.
• Chimneys & furnace vents – Uncovered openings provide easy access.
• Gaps in siding or framing – Even small cracks can be entryways.
• Open doors & windows – Especially at night when bats are active.
• Cold air currents – Bats may follow airflow into attics, barns, or sheds.

Once bats get inside, they return year after year unless you seal all openings and install deterrents.

Final Thoughts 

Bats may be beneficial to the environment, but they don’t belong in your attic. Their droppings carry disease, their presence damages your home, and their removal requires careful, legal methods.

While DIY bat removal is possible, it can be risky and time-consuming. If you have a large colony, baby bats, or significant guano buildup, hiring a wildlife control expert is the safest option. Professionals can remove bats legally, seal entry points, and clean up hazardous bat waste.

If you decide to handle removal yourself, use caution, follow state laws, and always wear protective gear when dealing with bat guano. Sealing your home properly is the key to keeping bats out for good.