: There are only 32 houses in a standard set. If the Bank runs out, no more can be built until someone sells theirs or upgrades to a hotel. Timing Your Purchase
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 when can i buy a house in monopoly
You cannot simply buy a house because you have the cash; you must first satisfy these conditions: : There are only 32 houses in a standard set
: You can technically build while another player is moving, though common "gentleman's agreements" suggest waiting until a dice roll is completed. This flexibility is often misunderstood, but as long
: You must own all properties within a specific color group (a "monopoly") before you can build any houses on them.