http://brewwiki.win/wiki/Post:....How_Much_to_Install_
You're tired of having to climb up to open the door to your pet. A cat flap may be the solution. Pet-flap fitters can put them on any type of door, including uPVC or composite doors. They can also install them into a variety of wall types. Security Cat flaps are often installed on doors, but many have them installed in windows or double-glazed doors. Having one fitted into glass can be a good option for those who don't want to cut through a wall or wooden door, and it's also the ideal solution for those who live in rental pro