How to upgrade the housing grade
All the conditions for upgrading the house are on the information board in front of the house. Just click "View" near the information board to view the detailed information.
To upgrade the house, you need to complete two tasks. The first is to meet the upgrade conditions, and the second is to have enough materials. The completion of the task and the collection of materials can be completed by clicking the corresponding icon, and a certain number of gold coins are needed to upgrade.
If there are not enough gold coins, you can also click the loan icon to make a loan, but the loan is not easy and needs to meet certain conditions. There is no need for loans in the early stage of house upgrading, and it is more likely to be used if there is a large demand for funds in the later stage.