This is minimums of course. More space the better if you have the room for it.They do but for 4 it’s not so bad. That’s only a 4x4 coop and 4x10 or 6x7 or similar size run. Not terrible size wise. And you can raise the coop up and put it inside the run to save room.
Also for practicality, you have to consider how difficult it would be for you to access and maintain a very small coop or run. It probably sounds easier because "small" but the reality is you will need to do more frequent cleaning in a tighter set up, and it's also hard to get tools (and your body) in and out of a tighter set up.