https://squareblogs.net/textsw....ing13/choosing-cat-f
You'll need an installer for your cat flap in order to install a pet door inside your uPVC or glass panel. They can also help with more sophisticated models such as microchip pet flaps. DIY attempts to install a pet flap often fail and cause issues such as draughts and low energy efficiency. Professional tradespeople can help you save from the stress and expense of dealing with these problems. Cost There are many factors that can affect the cost of cat flap installation. The cost is affected by the type of flap, the mater