I upgraded the vanilla blacksmith six times for your survival villages. They are rather easy to build so you don't have to farm an eternity to build them. If you have a small village, there is a blacksmith for you. If you have a town or a city you can opt for one of the bigger ones. They have interior with chests for storage, a stable for your horses and a barn for hay or even more storage. The house comes with three bedrooms if your friends come over