They'll have a 30x10 run, and then an additional 40x20 area of free-range space for 15-30 minutes a day. We could add 1 or 2 more sometime before August if we desperately needed to. I know someone who will have started pullets by then. We'd rather not if we don't have to though.
The plan is to start with 4 and then add 1-3 every couple years, up to a max of 10 chickens. That way egg laying is staggered. We could do a max of 12 with our run and coop, but we'll see how we feel about that once we build the darn thing and get to that point.
After reading all the answers, I will maybe state the obvious but in your case and your setting, prepare for the worse means have a space ready in case you need to isolate a cockerel or a hen for several days. This will make things a lot easier if you have a problem, and since you haven't finished building your coop and run you can plan it ahead.It all depends on the demeanor of the male.
Hope for the best, but prepare for the worst.
This will be very useful in any case, you are going to need to have separate places if you plan on introducing younger generations to your flock, you will certainly need to isolate an unwell chicken one day, and so on.