https://www.repairmywindowsand....doors.co.uk/cat-flap
A cat flap allows you to give your pet more freedom while avoiding the headache of having to let them in and out. It will also help your pet feel less stressed and prevent them from entering the house when they're not wanted. To fit a cat flap in your door, measure from the bottom of their stomachs to the floor and draw a line on the door panel. Make sure the line is level with the spirit level. 1. The type of door It is recommended to consult a professional if you want to install a cat flap in an uPVC or double glazing glas