Im thinking of adding some bi folding doors to my new extension. I have heard that they can be quite expensive but they look really cool. Im trying to work out whether they are worth it or whether I should just go for some french patio doors. We spend a lot of time in our garden and bi fold doors would open up our new living area into the garden. Im guessing UPVC bifold doors are cheaper but they don't look as nice as aluminium bifold doors. Can any one advise on any reputable companies? Any help/advice would be great! Thanks, Ben.