The Bat Roost Priority index (BRP) is an index that includes both biotic bat data and data on the potential threats of a roost, indicating the conservation priority of this roost. This index has only been applied to roosts in Catalonia that meet the minimum criteria for its calculation.

Biological importance (BI) refers to how important the bat community inhabiting the roost is compared to other roosts (total abundance, species richness, presence of endangered species, etc...). This index has only been applied to roosts in Catalonia that meet the minimum criteria for its calculation.