Once a settlement reaches a certain size and/or the player obtains necessary perks, they can invite others to set up shop at their base by building unique resources such as the trading post, which adds a vendor NPC stocking some of the best items in the game.hese stats need to be maintained to sustain or stagnate the growth of a settlement. Each Necessity would also act as a dependency on other necessities; i.e. people need water, food, beds and happiness to keep increasing.