Bi-fold doors are an excellent alternative to Patio doors and French doors especially if you are looking for something different for a large opening. The folding feature of bi-fold doors adds a sense of space in a stylish way. These doors are weather resistant, energy efficient and require very little maintenance once they have been installed. They are available in different configurations and colours. The most popular colours include Rosewood, PVC White, Golden Oak, Mahogany, Irish Oak, Simply White, Black Brown, Clotted Cream and Anthracite Grey.