Changes

The formula to calculate the carpentry skill needed to build a house is the number of tiles + the number of outer walls - 5. For example: a 4 by 4 wall has 16 tiles and 16 outer walls so it would take 27 carpentry on the ground/first floor. For multi-story houses the formula is the same but there's an additional requirement based on the number of floors.

Plan and completely build the walls before adding a roof. Roofs are planned by activating a [[mallet]] and right-clicking the tiles on the ground beneath you. Each tile needs to be planned, then built with the required materials.