How to Remove Bats from Your Attic in Florida: A Step-by-Step Guide

Reviewed by Steve DeMoor (“Dr. Critter”), Florida wildlife control professional since 1996.

If you can hear scratching above your bedroom ceiling at dusk, see small dark stains around a soffit, or find small piles of dark droppings in the attic insulation, you probably have bats. In Central Florida this is increasingly common, but how you handle it matters: bats are a protected species under Florida law, and removing them the wrong way is both illegal and likely to kill the colony.

The Florida Law: Maternity Season Closes the Window from April 16 to August 14

Florida Administrative Code 68A-9.012 prohibits the exclusion or removal of native bats from April 16 through August 14. This is the maternity season — the period when flightless pups are in the roost. Adult females leave to feed each night and return to nurse; if exclusion devices are installed during this window, the adults are locked out and the pups starve. The Florida Fish and Wildlife Conservation Commission (FWC) is the enforcing authority. Read the FWC bat conservation guidelines for the official rules.

What this means in practice: if you discover bats in your attic in May, the legal answer is to monitor and plan exclusion for the second half of August. Pups become independent around mid-August; once they can fly with the colony at dusk, exclusion is permitted again.

Step 1: Confirm It’s Bats (Not Rats, Birds, or Squirrels)

Signs that point to bats specifically rather than other attic invaders:

• Sound timing: Bats leave the roost at dusk and return before dawn. Rats and squirrels are more active during the day in attics.
• Guano: Bat droppings are dark, dry, crumbly, and shiny when crushed (undigested insect parts). Rat droppings are uniform with rounded ends.
• Dark staining: Brown or black smears where bats squeeze through entry points — body oils stain wood or stucco over time.
• Emergence: Stand outside at dusk in summer and watch the roof line. Bats will exit one after another in a steady stream.

Step 2: Find Every Entry Point

Bats can squeeze through any gap larger than 3/8 of an inch — roughly the width of a pencil. The most common Central Florida entry points are:

• Roof-line junctions where the soffit meets the gable
• Ridge vents and gable louvers without exclusion mesh
• Dormer flashing that has lifted
• Gaps around the chimney where flashing pulls away
• Construction gaps at the top of brick or block walls (“frieze gaps”)

You have to find every active entry. Miss one and the exclusion fails — the bats just shift to that gap on the second night and re-enter.

Step 3: Install One-Way Exclusion Devices

The only humane and effective bat removal method is a one-way exclusion device. We use either a vented funnel or a netted sleeve installed over each active entry point. The geometry lets bats drop down and fly out at dusk; it does not let them crawl back in. We do not use trapping, poisons, or sealants on active entries — those methods kill the colony and leave decomposing carcasses in your walls.

Devices stay in place 5 to 7 nights. This sounds long, but stragglers, sub-adults, and members of the colony that may have been roosting in a deeper void on a given night all need an opportunity to exit. Removing devices too early is the single most common reason DIY exclusions fail.

Step 4: Permanently Seal Every Entry

Once the colony has fully exited and a final emergence count confirms zero activity for two consecutive nights, the devices come off and each entry point is sealed permanently. For Central Florida construction we use copper mesh (rust-proof, chew-proof) backed by polyurethane foam, then capped with matched flashing or stucco. Caulk alone is not enough — bats will reopen a caulked gap within a season.

Step 5: Guano Remediation and Histoplasmosis Safety

Bat guano accumulates in roosts for years and carries Histoplasma capsulatum, the fungus that causes histoplasmosis — a lung infection that ranges from flu-like in healthy adults to life-threatening in immunocompromised people. The fungus is in the dust that becomes airborne when guano is disturbed.

For any guano deposit larger than a small flashlight beam, this is not a DIY job. Our remediation technicians wear HEPA-filtered respirators and Tyvek suits, mist the deposit with EPA-registered antimicrobials to suppress airborne spores, then HEPA-vacuum and bag the guano. Contaminated insulation is removed and replaced. The treated area is fogged with a bond-on antimicrobial before re-insulating.

If your attic has more than a season’s worth of guano, do not enter without a proper respirator. A simple dust mask does not stop Histoplasma spores.

Cost and Insurance Guidance for Florida Homeowners

Bat exclusion plus guano remediation is typically the most expensive wildlife job we do in a Florida attic because the labor and PPE requirements are real. Many Florida homeowners’ insurance policies will cover guano remediation and damaged insulation when documented as part of a wildlife claim, though policies vary widely on bat-specific damage. Get the inspection in writing with photos before you file — that’s what insurance carriers ask for.

When to Call a Professional

Bats are not a DIY job in Florida, both for legal reasons (FAC 68A-9.012) and health reasons (histoplasmosis). If you suspect bats in your Central Florida attic, the right next step is an evening emergence count to confirm the colony and document the entry points before the legal exclusion window opens. Schedule a free bat inspection or call 800-932-7287.