After building a house, you need to wait for the wall to dry thoroughly, usually at least one month, to ensure that the wall is dry enough before you can decorate it. Therefore, the transformation may take some time. The time of decoration also depends on the decoration method and materials you choose. Simple decoration may take 1 to 2 months, and complex decoration may take longer.
Generally speaking, it may take 4 to 5 months from the start of construction to the completion of decoration, but the specific time depends on many factors. I suggest you make a plan in advance and communicate with construction personnel and decoration personnel to ensure everything goes smoothly.