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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 generate a constructed roof unless you apply a no roof region. 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 (13x13 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

Divides rooms. Must be manually opened and closed, which slows people down.

Material	HP	Cost	Build Time	Flammable	Opening Speed	Beauty	Value
Gold	90	500	14	20%	100%	108	$10,010.20
Granite Blocks	405	25	74	0%	45%	3	$62.70
Limestone Blocks	383	25	74	0%	45%	3	$57.70
Marble Blocks	330	25	74	0%	45%	3	$57.70
Plasteel	420	25	14	10%	100%	0	$685.20
Sandstone Blocks	360	25	74	0%	45%	2	$57.70
Silver	105	500	14	20%	100%	18	$510.20
Steel	150	25	14	20%	100%	0	$60.20
Slate Blocks	345	25	74	0%	45%	2	$57.70
Uranium	375	500	50	0%	90%	0	$2,510.20
Wood Logs	75	25	10	100%	120%	3	$45.20

Autodoors

Divides rooms. Powered operation allows people to move through it without slowing down, with the exception of stone doors. Requires a constant 50W charge to operate. A powered door opens four times as quickly, but if un-powered it acts just like a standard door. It has the same max hit points of a standard door of the same material. (A powered door requires at least ~57.69% base speed for no slow down, while un-powered requires 4x that speed, excluding all types.)

Material	HP	Cost	Steel Cost	Build Time	Flammable	Opening Speed	Beauty	Value
Gold	90	800	35	18	20%	100%	108	$16,083.20
Granite Blocks	405	40	35	93	0%	45%	3	$167.20
Limestone Blocks	383	40	35	93	0%	45%	3	$159.20
Marble Blocks	330	40	35	93	0%	45%	3	$159.20
Plasteel	420	40	35	18	10%	100%	0	$1,163.20
Sandstone Blocks	360	40	35	93	0%	45%	2	$159.20
Silver	105	800	35	18	20%	100%	18	$883.20
Steel	150	75	-	18	20%	100%	0	$163.20
Slate Blocks	345	40	35	93	0%	45%	2	$159.20
Uranium	375	800	35	64	0%	90%	0	$4,083.20
Wood Logs	75	40	35	13	100%	120%	3	$139.20

Walls

An impassable wall. Capable of holding up a roof. Walls can be built out of any material. Power conduits may be constructed on an existing wall.

Material	HP	Cost	Build Time	Flammable	Beauty	Value
Gold	135	120	2	20%	108	$2,401.80
Granite Blocks	606	6	22	0%	3	$14.40
Limestone Blocks	574	6	22	0%	3	$13.20
Marble Blocks	495	6	22	0%	3	$13.20
Plasteel	630	6	2	10%	0	$163.80
Sandstone Blocks	540	6	22	0%	2	$13.20
Silver	158	120	2	20%	18	$121.80
Steel	225	6	2	20%	0	$13.80
Slate Blocks	518	6	22	0%	2	$13.20
Uranium	225	120	9	0%	0	$601.80
Wood Logs	113	6	2	100%	3	$10.20