Bi Fold Doors create more space from larger openings. They stream light into new extensions and rooms that let the outside in. There are many BiFolding options available with some cheaper suppliers around. Be careful as to what quality of bi folding door you buy as it should be treated as a one of investment. Aluminium bifold doors are the mosst popular because of strength and sizes available, also they come in a range of over 1000 colour options. Smart Aluminium Bi Folds seem to be the market leaders and you can get good deals on Smart Bifold Doors from Double Glazing Shop.
Integral blinds for bi fold doors are something to consider when you have openings of upto 6m wide by 2.1m tall, its nice to have the light but the privacy needs to be there to.