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It is best to hire an expert to install a cat-flap inside your home. DIY projects often result in poorly fitting pet flaps that could let in draughts or increase energy bills. SheffLOCK can be installed as the cat flap into all kinds of doors like wood composite, uPVC and glass doors as well as exterior walls. It takes about 2 hours on average to put up a new cat flap. Cost of pet flap A pet flap allows your cat to go and come whenever it wishes. If the flap is not correctly fitted, it could let heat escape from your home, and allo