Bats, Bat boxes, and Bat-pups ?

Hello!

We have a few bats delightfully flapping around the garden.

I’m considering getting a Bat box for them to roost in.

Apparently, it’s around the right time to do so.
It’s during the Autumn that the dog bat (I’m guessing that they are called this) impregnates the bitch bat (ditto).

However, the mummy-to-be bat stores the sperm and doesn’t have the pup until the Spring.
They usually only have one offspring, occasionally two.

Does anyone have any experience of housing bats?
DH was going to build the bat box, but they are a bit more complicated than we previously thought, as they need to have special little ladders.

Apparently, you need to have a licence to open the box and check on the bats.

Thank you! ? x