: None of the properties in that color group can be mortgaged.
: You can build between the turns of other players. when can i buy a house in monopoly
: You must own all properties within a specific color group (a "monopoly") before you can build any houses on them. : None of the properties in that color
While the "at any time" rule is broad, there are practical limits and community etiquette to consider: While the "at any time" rule is broad,
: You can technically build while another player is moving, though common "gentleman's agreements" suggest waiting until a dice roll is completed.
The official Monopoly rules state that you can buy and erect houses " at any time ". This flexibility is often misunderstood, but as long as you meet specific property requirements, you don't even have to wait for your own turn to start building. Core Requirements for Buying Houses
: Some interpretations suggest you can buy houses even while the dice are in the air, but many players agree that once the dice land, the rent is fixed based on what was on the board at that exact moment.