The cost of a composite door will depend upon the design, size and supplier. Furniture, such as handles letterboxes etc vary by quality and look. However, you can expect to see composite door prices in the region of £900 to £1,200 fitted
With bifold doors there is nothing to spoil the view once opened. Stacked neatly to the sides, each door panel remains out of the sight lines and allows for truly panoramic views.
Learn more here: Bifold doors cost 2020 | Fully Fitted Bifold Doors Price Guide
You will also need to consider ventilation. Due to Double Glazed Doors being airtight, reduced ventilation will result in condensation. More Info at https://www.french-patiodoors.co.uk/conservatory-doors/