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A 4'x8' house (the coop) is just the right size for 8 chickens. If you go by the general rule of thumb that says 4 s.f. per bird indoors. But this also depends where you live, climate-wise, and what your set-up is like. For instance, My coop is 4'x8' but I keep 14 chickens in there. Their nest box isn't in the coop, it's a compost barrel turned into a community nest. One side of my coop is completely open air because we have an extremely hot, dry climate. Not all of my chickens sleep inside the coop, some sleep on top of the carport frame that I used as fence posts for their pen. So, I really only have about 10 chickens that sleep in the coop, and they don't lay in there, so there's actually extra room in the coop.
Now, if you live somewhere that gets very cold, snowy, etc. and your birds will need to be closed up in their coop for any length of time, you want to have as much room in there as you can. Chickens cooped in crowded conditions will often start picking each other or eating their eggs or sometimes will get aggressive with people.
The pen size you mention is more than ample for 8 chickens or even more. I tend to make the pen as big as I possibly can.