I currently have a back porch with a porch above it for my second floor. What I am trying to do is enclose the lower part. It has a light and measures 10.5' x 12'. I am thinking of trying to go full removable glass/screen panels if possible, to replace them in winter/spring. Do I need a permit? Is there anywhere I can find these glass/screen panels? The height is currently about 100" at the highest point and 92" at the lowest point.
Permitting is something you'll have to ask your local building code department.
As for the actual panels, I'd start with local glass shops and online. Remember that dimensionally large items can get expensive to ship so make sure getting a shipping quote too. I would definitely suggest seeing what's available in panels before you do anything else. If you can use standard sizes for the panels and adjust the framing, it may be considerably cheaper than all custom sizes.