https://telegra.ph/Installing-....a-Cat-Flap-in-a-UPVC
If you're planning to install a pet flap inside your uPVC door or glass panel, then you're going to need the assistance of a skilled cat flap fitting expert. They can also help with more advanced models, like microchip pet flaps. DIY attempts to install a pet flap can often cause problems like draughts or low energy efficiency. A professional tradesperson can spare you the headache and expense of dealing with these problems. Cost There are a number of factors that affect the cost of installing a cat flap. The type of