What are the Monopoly house building rules?

Answer 1

In Monopoly, players can build houses on their properties if they own all the properties in a color group. The cost of building a house varies depending on the property's position on the board. Players must build evenly, starting with one house on each property before building a second house, and so on. Once a player has four houses on each property in a color group, they can then build a hotel.