Bat Removal and Exclusion in Riverview
How bats get into a newer house
There is a common assumption that a newer house is a sealed house. It is tighter than a 1950s cottage, but tightness is not the same as closed, and an adult bat only needs an opening of roughly three eighths of an inch. On a Riverview subdivision home the ways in tend to be features rather than faults: barrel and Spanish tile leaves an open void at the end of every course, a two story elevation puts a gable vent out of sight and out of ladder reach, and where a lanai or porch roof ties into the main plane there is a junction that was detailed to shed water rather than to keep an animal out.
That distinction matters when you go looking. On an older house you are hunting for damage. Here you are looking at how the building was assembled, which is why an inspection that only checks for holes can come back with nothing while the colony is still in the roof.
Why the river corridor concentrates the problem
A roost is only worth using if the food is close. The Alafia corridor keeps mature oak and cypress along the water and supports heavy insect activity after dusk, and the subdivisions here were built right up to it. A colony in a tile roof three streets back has everything it needs within a few minutes of flight.
It also means eviction alone does not settle anything. A building that stays enterable remains available, and the animals that left are still foraging in the same corridor and still know the address.
Exclusion, and the season the state sets
Exclusion closes the building rather than killing anything in it. Every gap in the envelope gets sealed apart from the openings in use, those get one way doors that let a bat drop out and give it no way back, and once the roost is empty the doors come off and the last openings are closed permanently.
Florida protects bats all year and prohibits exclusion without appropriate authorization between April 16 and August 14, while the pups cannot yet fly. April 15 is the last day exclusion can be carried out without a permit, and the unpermitted window reopens on August 15. Exclusion devices stay in place for at least four nights with forecast overnight lows of at least fifty degrees. Sealing an occupied entry point inside that window traps the colony in the building, which is unlawful and leaves the structure far worse off than the bats did.