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In RimWorld, your colonists are able to create buildings from the ground up. Structures can be made from a variety of materials, each with varying hitpoints, flammability, and beauty.

Enclosed areas will automatically prompt colonists to build a roof unless you apply a no roof region, or if the structure is too large (over 400 cells). As of Alpha 12 a roof can extend up to 6 cells from a wall, so interiors have a maximum size of 12 cells on the shortest side. This allows for 12 by 12 square rooms (14x14 including walls) or 12 by X rectangular rooms. Rooms built larger than this will remain unroofed (colonist buildings) or result in a roof collapse (mined rooms). Larger rooms can be built with the use of single-wall pillars.

Doors

Doors separate rooms for the use of ratings and bedrooms. They require manual operation to use, and slows down colonists when they operate it. Doors always require 25 units material to construct.

Material	HP	Cost	Build Time	Flammable	Opening Speed	Beauty	Value
Gold	150	500	19	20%	100%	0	$7505.00
Granite Blocks	405	25	74	0%	45%	0	$62.70
Limestone Blocks	390	25	74	0%	45%	0	$57.70
Marble Blocks	330	25	74	0%	45%	0	$57.70
Plasteel	420	25	14	10%	100%	0	$685.20
Sandstone Blocks	360	25	74	0%	45%	0	$57.70
Silver	175	500	14	20%	100%	0	$510.20
Steel	150	25	14	20%	100%	0	$60.20
Slate Blocks	345	25	74	0%	45%	0	$57.70
Uranium	375	500	50	0%	90%	0	$2,510.20
Wood Logs	75	25	10	100%	120%	0	$45.20

Autodoors

Autodoors have powered operation to allow people to move through it without slowing down (with the exception of stone doors). They require a constant 50W charge to operate. A powered autodoor opens four times as quickly. An unpowered one acts just like a standard door. Autodoors have the same max hit points of a standard door of the same material. A powered door requires at least ~57.69% base speed to not slow colonists down, while unpowered doors require 4x that speed (which excludes all unpowered doors). Like standard doors, autodoors divide rooms for the purpose of bedrooms and ratings. Autodoors require 25 materials and 2 components to construct.

Material	HP	Cost	Steel Cost	Build Time	Flammable	Opening Speed	Beauty	Value
Gold	150	800	35	24	20%	100%	0	$7630.00
Granite Blocks	405	40	35	93	0%	45%	0	$167.20
Limestone Blocks	383	40	35	93	0%	45%	0	$159.20
Marble Blocks	330	40	35	93	0%	45%	0	$159.20
Plasteel	420	40	35	18	10%	100%	0	$1,163.20
Sandstone Blocks	360	40	35	93	0%	45%	0	$159.20
Silver	105	800	35	18	20%	100%	0	$883.20
Steel	150	75	-	18	20%	100%	0	$163.20
Slate Blocks	345	40	35	93	0%	45%	0	$159.20
Uranium	375	800	35	64	0%	90%	0	$4,083.20
Wood Logs	75	40	35	13	100%	120%	0	$139.20

Walls

An impassable wall, capable of holding up a roof if the space between supporting walls and beams is not too far away. Walls can be built out of any material and Power conduits may be constructed on an existing wall. Walls require 5 materials to construct.

Material	HP	Cost	Build Time	Flammable	Beauty	Value
Gold	210	100	4	20%	0	$1500.00
Granite Blocks	595	5	22	0%	0	$15.72
Limestone Blocks	540	5	22	0%	0	$14.72
Marble Blocks	420	5	22	0%	0	$14.72
Plasteel	980	5	5	10%	0	$136.20
Sandstone Blocks	490	5	22	0%	0	$14.72
Silver	245	100	3	20%	0	$100.72
Slate Blocks	455	5	22	0%	0	$14.72
Steel	350	5	3	20%	0	$10.60
Uranium	875	100	5	0%	0	$500
Wood Logs	175	5	2	100%	0	$7.42