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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, or when demolishing pillars). Larger rooms can be built with the use of single-wall pillars.

Doors

Doors provide entry points through walls for colonists while still keeping out enemies and wild animals. Pawns manually open doors which causes a delay as they try to pass through, as opposed to auto-doors which open on demand and allow faster passage. A door can be locked by marking it forbidden. Colonists can't use locked doors. Visitors and colony animals can pass through doors, even if locked. A door can be marked to 'Hold open' so that the next time it's opened it will stay open.

Material	HP	Cost	Work Required	Flammability	Opening Speed	Value
Gold	150	500	19	20%	100%	$7505.00
Granite Blocks	425	25	74	0%	45%	$62.70
Limestone Blocks	390	25	74	0%	45%	$57.70
Marble Blocks	300	25	74	0%	45%	$57.70
Plasteel	700	25	14	10%	100%	$685.20
Sandstone Blocks	350	25	74	0%	45%	$57.70
Silver	175	500	14	20%	100%	$510.20
Steel	250	25	14	20%	100%	$60.20
Slate Blocks	325	25	74	0%	45%	$57.70
Uranium	625	500	50	0%	90%	$2,510.20
Jade	125	500	50	0%	90%	$2,515.00
Wood Logs	100	25	10	100%	120%	$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 40 steel, 25 materials and 2 components to construct.

Material	HP	Cost	Steel Cost	Work Required	Flammability	Opening Speed	Value
Gold	150	800	35	24	20%	100%	$7630.00
Granite Blocks	425	40	35	93	0%	45%	$167.20
Limestone Blocks	390	40	35	93	0%	45%	$159.20
Marble Blocks	300	40	35	93	0%	45%	$159.20
Plasteel	700	40	35	18	10%	100%	$1,163.20
Sandstone Blocks	350	40	35	93	0%	45%	$159.20
Silver	175	800	35	18	20%	100%	$883.20
Steel	250	75	-	18	20%	100%	$163.20
Slate Blocks	325	40	35	93	0%	45%	$159.20
Uranium	625	800	35	64	0%	90%	$3,130.00
Jade	125	800	35	64	0%	90%	$2,645.00
Wood Logs	100	40	35	13	100%	120%	$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	Work Required	Flammability	Value
Gold	210	100	4	20%	$1500.00
Granite Blocks	595	5	22	0%	$15.72
Limestone Blocks	540	5	22	0%	$14.72
Marble Blocks	420	5	22	0%	$14.72
Plasteel	980	5	5	10%	$136.20
Sandstone Blocks	490	5	22	0%	$14.72
Silver	245	100	3	20%	$100.72
Slate Blocks	455	5	22	0%	$14.72
Steel	350	5	3	20%	$10.60
Uranium	875	100	5	0%	$500.00
Jade	125	100	5	0%	$505.00
Wood Logs	140	5	2	100%	$7.42