Why won't iron golems spawn?
My survival iron golem farm /
I set everything up (4 vertical blocks, 21x21 spawning platform, 4 villager cages, 16 villagers, and the killing platform down below, cleared out any doors/golems nearby), but no golems are spawning. Can someone tell me what I did wrong with my build?
I think that your doors are not considered as houses for some reasons. Have a look at Tutorials/Village mechanics for what you can change.