At the moment we dont have a cat flap. KittyMoln either sit waiting on the front window ledge and comes in when we open the window (or goes in and outas he pleases if the window if left open) or jumps up on the garden table and looks through the widow in the back and gets let in through the back door, as the window isn't openable.
We're doing a big of renovation in the house (slow progress as we're doing it outselves) there's and to be a totally new (openable) window and different positioned backdoor put in. The idea is to have a cat flap in the new back door. However I thoughg it might make more sense if hecouldcome in and out thw window (as doors are more expensive to replace than the double glazed window planes should it ever come to be we don't want a car flap anymore )
I'm somewhat pro getting a cat flap because currently I leave him inside when wego out because I don't like the idea of him not being able to get in for food etc
DH thinks a cat flap in the window is mental but they can be put in glass doors can't they? Or is it bonkers?