Changes

Buildings can be constructed with multiple stories, but each one requires higher skill to build.

The more floors your house has, the more skill is needed; see the table below for the required skill levels. Only the first (ground) floor planning needs 1 [[carpentry]] skill per wall and 1 skill per tile minus 5. With 5 skill a roof may be placed over the first floor, but not an opening or floor above. The roof counts as the same story you are currently building and does not require any extra skill to roof. For example, a roof added to a 8 story building would still only require 70 skill.