Phase 4: Build Houses

In reverse player order each player may connect any number of cities if they pay everything, then moves their house to the bottom row. Every city after your first must connect to your network: pay the cheapest connection costs from your network plus the building cost of the city. Cities added this turn can be used to reach further cities. Each time you add a city you move up the connected-cities scoring track. When connecting several at once, lay the new houses on their sides until all costs are paid, then stand them up.