Multi-story housing

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Multi-story structures can only be built on flat tiles.

Skill needed

More skill is required per level, see the table below. Only the first (ground) floor planning needs 1 skill per wall and 1 skill per tile. With 20 skill a roof may be placed over the first floor, but not an opening or floor above. For upper floors, the roof counts as a floor (although it may have less of a skill requirement than an opening or floor above- unconfirmed).

Floors	Carpentry
2	21
3	<24
4	<24
5	<31
6	40

Floors	Carpentry
7
8	60
9	<77
10	90
11

Floors	Carpentry
12
13
14
15	99

Adding a roof

Plan and completely build the walls.
Use a mallet to plan the ground floor.
Use mallet on tile below and plan floor below.
Then plan roof above.
Use mallet on tile below and plan roof above.
Build them.

How to make another floor

Plan and completely build the ground floor.
Then use a mallet to plan the ground floor.
Use mallet on tile below and plan floor below
Then plan floor/roof above.
Use mallet on tile below and plan floor above
Plan a tile with an opening above to make a ladder climbing spot to climb up to upper floors.
Build them.
Use ladder to get up to upper floor.
For next floors build walls where needed and then plan roof/floor above.

Notes

There must be at least one planned wall below a tile to plan an floor above.
You can not build floors above fence walls or parapets.
You can drag carts up ladders to get them to an upper floor.
You can fall from upper floors if there is no wall/fence of roof to stop you. (Please be careful as people have died in 1 fall from 4th floor drops)
Ladders will always face the south side.