Houses are present in all cities at the beginning of the game and continue to appear or upgrade as the course of time is followed. Houses are fairly simple at the start of the game but, as your civilization grows; so will your citizen's homes. Homes, as you will have probably deduced from the previous sentences, hold families of citizens of your city. The residents of these houses will then go on to farm, research and maybe even take part in the construction of buildings, one of the most important aspects of development and victory in Civilization Revolution.