The Roof Tile House is the first unlocked residential building in the Iron Age and the fifth residential building overall. It is unlocked by researching the Roof Tile Houses technology. It produces 15 Coins in 15 minutes, and provides 44 population, relatively high compared to previous buildings.
Once one unlocks the Frame House, they should replace Roof Tile Houses if they can afford it, due to Frame Houses having the same amount of gold per hour, as well as a higher population provided.
15.00 per tile and hour