Looking for House Extensions

Hi, I am looking into options to get a cat flap installed in a glass door that connects the living room with the garden. The door is uPVC and double glazing. I think I may need one of these: – a hole for a cat flap in the existing panel, if this is something that can be done (double glazing with bars); – a new double glazing unit with the hole for the cat flap already made into the glass, if this exists or can be done; – a new double glazing unit with a bottom panel that is not glass (uPVC perhaps?) where the hole for the cat flap can be made. Based on your description, this is probably a too small job for you. I would be happy to get a response, even if negative, so I can move on to ask other tradesmen or start to look into doing this myself?Thank you and best wishes, Violeta