https://hawkins-grant.blogbrig....ht.net/adding-a-cat-
Are you tired of having to climb up and down to open the door for your pets? If this is the case, a cat door could be the solution. Pet-flap fitters can put them into any kind of door, including uPVC or composite doors. They can also be installed in certain types of walls. Security Cat flaps are often fitted to doors, but many also install them in windows or double-glazed doors. If you don't have a wooden door or wall or window, installing one in glass is a great idea. It's also a great solution for