Since you do have broody breeds (Aussies, SLWs, and Orps) make sure to keep in mind that your nest boxes may clog up during late spring and summer (broody season). I keep a large dog crate as a permanent fixture in my Orpington coop during the summer (for breaking broodies).
You could possibly get away with three nest boxes. But the more the merrier.

You could possibly get away with three nest boxes. But the more the merrier.
