The Poop on Bat Poop

A:

Bats in the eaves of the house shouldn't cause any structural damage to your house. However, if they are accessing the interior of the structure, buildup of feces and urine (guano) over time can become damaging. Outside, on your deck for instance, it's unlikely that you would have sufficient quantity of guano to result in disease organisms in any significant number. Histoplasmosis does grow in the nutrient rich guano, but if you regularly clean the deck you probably aren't going to have much problem.

Bat Conservation International has good information on bats generally, including on managing bats in and around homes.

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