Houses are used to obtain resources and require 100 production to build. Houses can be set to be used by 5 different types of citizens, Farmers, Workers, Scientists, Artists, and Merchants. Each House needs one population to be able to work, otherwise it will become an abandoned house. Depending on where the house is placed decides the happiness and the productivity of the citizens living there (certain Buildings and Civics will also change happiness and productivity). As a House increases its productivity it will grow in size.