Bi-fold doors allow you to open up your living space magnificently letting in light and air from your garden. They are the perfect choice for those of you who love to entertain or spend plenty of time outside during the warmer summer months. Bi-fold doors also come in a wide variety of types, one of which is UPVC. UPVC bi-fold doors are a great option as they are safe, secure and low maintenance. These doors also come in a wide variety of styles with a huge range of colours and finishes to choose from.