https://longshots.wiki/wiki/Doors_With_Cat_Flap
It is recommended to hire an expert to install a cat-flap in your home. DIY projects typically result in a poorly-fitted pet flap which allow drafts and cause higher energy bills. SheffLOCK can fit a cat flap on all types of doors including wood composite, uPVC, composite, glass doors and even external walls. On average, it takes around 2 hours to install the cat flap. Cost of the pet flap A pet flap is an ideal way to let your cat leave and come as it pleases. If the flap is not properly installed, it will let heat escape from your home,