Even when plans are smaller (D size) you see the contractor printing 1/2 size sets. Actually with better SW and printing now, reduced sizes are still readable. That said, most plan checkers want a minimum size text, 1/8" high or so. With all the info that usually goes on a floor plan it can get crowded at smaller scales. You can help by utilizing the software to carefully arrange the info,use more plans: ceiling plans, separate power and lighting plans etc. to put the info on. Personally never gone below 1/4"-1'. If necessary. I have a 1/8"=1'scale overall plan then provide larger plans of sections of the house.
Just make sure it is legible under the Bldg. dept. standards and check if they'll take it.
Ideally everyone would have iPads but that hasn't translated to ease of use at the site yet.
I heard in Europe--don't they use smaller format, sort of like a book?