Door

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 autodoors which open on demand and allow faster passage. All doors are generally locked to hostile entities, including prisoners, raiders and mad animals. A door can be marked to "Hold open," which means the next time it is opened, it will stay open, and then all pawns can pass through. A door can also be marked "Forbid". Colonists and tamed animals don't use forbidden doors, even if they're held open. However visitors, traders, and colonists on mental breakdowns ignore the forbidden status.

Material choice

Typically, a colony constructs their first doors from wood, which is light and so opens more quickly than other doors. However, wood is both flammable and comparatively weak against attacks, so proves vulnerable as the early game moves into mid-/late-game conflict. Despite this, as interior doors, they are often still quite suitable, at least until better options are available.

Once they can be afforded, steel doors are a good balance of durability, flame resistance and price. The next step up for doors that are often closed/opened would be plasteel, a precious material but unsurpassed in strength for defensive positions.

Stone doors can be problematic because they open so slowly. However, they do have a 0% flammability, making them a nice option for a firebreak at key locations; select them to be Held Open for normal traffic, and draft/shut them if/when the need arises. They can also be used for areas that are rarely entered, perhaps your chemfuel powered generators (which only need to be fueled once/6 days), or for the switch to a bank of emergency batteries. If you do choose to make use of stone doors, granite is your strongest choice, and no slower than any other stone.

Once autodoors have been researched, and you have the power and component supplies to reliably operate them, standard doors can be replaced with alternative materials and not slow down traffic at all, or at least slow it far less.

Stats table

Door	Beauty	Work to Build	HP	Flammability	Door Speed	Market Value
Material	Beauty	Work to Build	HP	Flammability	Door Speed	Market Value
Bioferrite	0	002,125 ticks (35.42 secs)	320	75%	100%	26
Gold	20	000,765 ticks (12.75 secs)	96	40%	100%	2,505
Granite blocks	0	005,240 ticks (1.46 mins)	272	0%	45%	41
Limestone blocks	0	005,240 ticks (1.46 mins)	248	0%	45%	41
Marble blocks	1	004,815 ticks (1.34 mins)	192	0%	45%	40
Plasteel	0	001,870 ticks (31.17 secs)	448	0%	100%	230
Sandstone blocks	0	004,390 ticks (1.22 mins)	224	0%	45%	38
Silver	6	000,850 ticks (14.17 secs)	112	40%	100%	255
Slate blocks	0	005,240 ticks (1.46 mins)	208	0%	45%	41
Steel	0	000,850 ticks (14.17 secs)	160	40%	100%	51
Jade	10	004,250 ticks (1.18 mins)	80	0%	100%	140
Uranium	0	001,615 ticks (26.92 secs)	400	0%	75%	156
Wood	0	000,595 ticks (9.92 secs)	104	100%	120%	32