Bifold doors, also known as folding-sliding-doors have traditionally only been available in retail environments. Mostly they have been used in interior locations in shopping malls and restaurants. Over the past few years’ new exterior bi folding doors have become available for residential use. They are an attractive alternative to the traditional sliding patio doors or French doors. Now they have become a phenomenon to put in a conservatory or alternative home extension. Often used in restaurants and cafes allowing the premises to be completely open to the street when our weather conditions suit. Now you can open your house up to the garden and let the outside atmosphere in which is idea for barbecues and parties.