Tier

Some blocks have tiers when used to construct a room. The tiers of the blocks used to construct a room determine the room's overall tier level, which affects what crafting stations can operate in it: for instance, the Anvil requires an overrall room tier of 1 before it will function. The overall tier of a room also determines the maximum skill points that can be gained from furniture placed in it.

Higher tier blocks require more advanced skills and crafting stations to produce, and in turn allow for a higher housing skill point cap and more advanced crafting stations.

Blocks

Image	Name	Tier
	Dirt	0
	Sand	0
	Stone (and other natural blocks, such as Iron Ore, Copper Ore, and Gold Ore)	0
	Log	0
	Hewn Log	1
	Mortared Stone	1
	Lumber	2
	Brick	2
	Glass	2
	Reinforced Concrete	3
	Corrugated Steel	3
	Flat Steel	4
	Framed Glass	4

Doors

Image	Name	Tier
	Door	1
	Hewn Log Door	1
	Stone Door	1
	Lumber Door	2
	Large Lumber Door	2
	Large Windowed Lumber Door	2
	Large Corrugated Steel Door	3
	Framed Glass Door	4

Examples

Reinforced Concrete building has its tier reduced slightly below 3.00 because of Dirt blocks.
Robotic Assembly Line is prevented from operating because of an inadequate building tier.
Uniform Reinforced Concrete building causes tier to increase to exactly 3.00.
Robotic Assembly Line is working due to adequate building tier.