As other manufacturers become aware of the program, we feel they will be eager to participate as well. BCI's guidelines for bat house construction 1. Roosting chambers or crevices must be a minimum of 20 inches tall. Minimum overall height of bat houses must be 24 inches. The overall width of the bat house must be at least 14 inches.
Greater widths are preferred.
Bat houses must possess a suitable landing area. Rocket or post style houses are an exception, as a rough-cut 4 x 4 post serves as the landing area. Metal hardware cloth or aluminum window screen is not acceptable, as it may cause injury to bats. Mesh must be securely stapled such that it does not sag, buckle, or curl. Staples must be flush with the roosting surfaces, such that no sharp edges could come into contact with bats.