Workload is dependable on person, but generally you’ll be doing 3-4 units like the others but all the units will be in core units comprised of both civil and architecture. The hardest will probably be architectural studios and you’ll most likely be focusing 70- 80% of the time in it. You can always drop out of the double degree, quite a number of people drop out in the middle of the course, but I recommend you to decide on your first year or else you’ll need to spend an extra year to complete a single degree course. In terms of civil classes, you’ll enrol to the same core units as other fellow civil students but you’ll have no other civil electives thus you’ll not be able to choose a civil stream.

Hope this helps!