Explore our range of Jeld-Wen Bi-Fold external doors & enjoy summer alfresco living. A stylish and space-saving solution that allows you to open large sections of your home to the outdoors. Exterior bi-fold doors are often glazed to draw in daylight. Bi-folds are an ideal way to transform previously dark rooms. Our range of folding external doors are available in a number of styles including grey, white and oak finishes.