Cat Doors
Installing a cat door, also known as a cat flap or cat hatch, can provide your cat or kitten with the freedom and a means to come and go from inside the confines of the home when they want. After all, most domestic cats like to be outside in the fresh air where they can wander around in their own territory, playfully frolic in the long grass and lazily watch birds fluttering in the trees while they lie in the shade away from the harsh mid-day sun.
Fitting a cat door into an existing glass door however can require a measure of expertise and the proper cutting equipment, so engaging a skilled professional contractor would be the best option if you want the job completed to a high standard.