Question 2. I would like to install bifold doors. What do I need to consider?

First of all, check your beams are strong enough to handle the load as all weight hangs from the lintels above.  Your floor must also be level so the bifolds are square allowing them to operate smoothly.  Screening bifolds  can be an issue, however, retractable screens are available.  Bifold units  over 4.8m are not recommended  – timber expands and contracts in the weather and because the doors are completely encased in a frame, the more doors means the more movement causing jamming.  Sealing the doors completely on all surfaces (including the top and underside) helps reduce the movement of the doors.    At least two strong people need to assist the driver with the unloading of bifold doors.  Bifolds over 3m are supplied in knockdown.