Multi-story housing

Multi-story house

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

Skill needed

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. 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. i.e Roof added to a 8 story building would still only require 70 skill.

You may have a total of 16 floors (counting ground level as the first floor)
Carpentry is the primary skill checked for planning each floor and building floors, openings, staircases, walls and fences out of wood.
The first floor always requires a skill of at least 5, even if the building plan has already been finalized by another character.
Paving is required for stone floors, openings, and staircases.
Masonry is required for stone walls, fences, parapets, as well as pottery and slate roofs. It is limited in multi story houses based on Carpentry skill.
Thatching is required for thatch roofs.
Some materials might have higher skill requirements than the numbers mentioned below, in which case the highest requirement applies

Floors	Skill Requirement
1	5
2	21
3	30
4	39
5	47
6	55

Floors	Skill Requirement
7	63
8	70
9	77
10	83
11	88

Floors	Skill Requirement
12	92
13	95
14	97
15	98
16	99

Adding a roof

Plan and completely build the walls.
Both floor and roof are planned by activating a mallet and right clicking the tiles on the ground beneath you. Each tile needs to be planned.
Build both.

How to make another floor

Plan and completely build the first floor outer walls.
Activate a mallet on a tile below and plan floor above
Plan at least one tile with an opening above to make a ladder for a spot to climb up to upper floors or plan your staircase.
Build the floors from below.
Activate a mallet, right click tile borders to plan walls.

Notes

In-game descriptions describe the bottom floor as being the 1st, which is a US standard. Therefore the Wurmpedia will describe this as such. The use of the term ground floor or ground will be kept to a minimum.
You can not build floors above fences, walls or parapets.
You can drag carts up ladders to get them to an upper floor.
You can fall and take damage 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 be on the south side of the opening.
The 1st floor must be complete before walls on the 2nd can be planned. This is not true, however, of any additional floors.
Where a mallet is mentioned a hammer can be used in its place.
When you destroy a structure all items on upper levels will fall to the ground.
Wall types can be found on the wall page.

Floor and Opening types

Housing floor types.

Floors	Openings	Staircases
Wooden plank floor	Wooden plank opening	Wooden plank staircase
Pottery brick floor	Pottery brick opening	Pottery brick staircase
Sandstone slab floor	Sandstone slab opening	Sandstone slab staircase
Stone slab floor	Stone slab opening	Stone slab staircase
Marble slab floor	Marble slab opening	Marble slab staircase
Stone brick floor	Stone brick opening	Stone brick staircase
Slate slab floor	Slate slab opening	Slate slab staircase
		Standalone staircase