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It is recommended to hire an expert to install a cat flap in your home. DIY projects often result in poorly-fitted pet flaps that let in draughts or increase energy costs. SheffLOCK can be fitted as a cat flap in most types of doors including wood composite, uPVC and glass doors and even external walls. It takes around 2 hours on average to put up a new cat flap. Pet flaps cost money A pet flap lets your cat to come and go whenever it wants. If the flap isn't fitted correctly, it can allow heat to escape