If you’re hearing fluttering or squeaking sounds at dusk, or noticing small dark shapes darting around your roofline at sunset, you likely have bats. Bat removal is one of the most time-sensitive wildlife problems a homeowner can face — legal restrictions mean there are only certain times of year the work can be done.
Signs You Have Bats in Your Attic
- Fluttering or squeaking sounds at dusk or dawn
- Dark staining around small gaps or cracks on your roofline — bat guano and oil from their fur
- Guano (droppings) accumulating in the attic or on exterior walls — looks like dark coffee grounds
- Strong ammonia smell from accumulated guano and urine
- Seeing bats exit your roofline at dusk in a stream or cluster
Why Bat Removal Is Different
Bats are legally protected in most states. You cannot simply trap and remove them at any time of year — doing so illegally can result in significant fines. Most states have a maternity exclusion period (typically May through August) during which exclusion work is prohibited because juvenile bats cannot yet fly and would be trapped inside.
This means bat removal must be done by a licensed professional who knows the legal requirements in your state and performs the work during the correct window. Never attempt DIY bat removal.
Health Risks of Bat Guano
Bat guano is not just a mess — it’s a genuine health hazard. Accumulated droppings can harbor Histoplasma capsulatum, a fungus that causes histoplasmosis, a serious respiratory illness. Never disturb bat droppings without proper respiratory protection. Professional decontamination is strongly recommended for any significant accumulation.
The Bat Removal Process
- Inspection — identify all roost locations and entry points (bats can enter through gaps as small as 3/8 of an inch)
- Guano assessment — determine the extent of contamination
- Exclusion (outside maternity season) — one-way devices allow bats to exit but not re-enter
- Sealing — all gaps and entry points permanently sealed after bats have exited
- Guano remediation — professional cleanup and decontamination
- Attic restoration — replace contaminated insulation
Don’t Wait on a Bat Problem
Because bat removal can only be done during specific times of year, waiting too long can mean missing the window entirely — leaving you with a colony in your attic for another full season. If you suspect bats, contact a professional immediately for an inspection even if the exclusion work can’t start