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There are a total of 23 available room types that begin at level 1 when built and can be upgraded with caps to a maximum of level 3. Most rooms can also be merged up to three times by placing an identical room of the same tier next to it. Generally, each room can facilitate two Dwellers. Merged rooms may be occupied by up to 6 Dwellers. Production rooms require a specific S.P.E.C.I.A.L trait to run, while training rooms increase a specific trait of the selected Dwellers. Production rooms can also rush production.

Floor layout[]

There are 25 floors; all floors can hold eight rooms. In addition, all floors can hold up to two elevators. Adding more than two elevators per floor will sacrifice space for other rooms. The vault can have a maximum of 200 Dwellers living in it.

Room overview[]

Rooms in Fallout Shelter typically split into two categories: production and training. The only exceptions are the Overseer's office, which enables one to send their Dwellers on quests; the vault door, which acts as a first line of defense from invasion; and elevators, which allow Dwellers to navigate between floors.

Empty rooms are vulnerable to infestation; if one cannot move Dwellers into an empty room to eradicate the problem, the infestation will spread to adjacent rooms.

Name Category Ability Population required Base cost Incremental cost Upgrade cost to Lv. 2 Upgrade cost to Lv. 3 Capacity Output Size
Vault door Misc. - - - - 500 2000 - - 6
Elevator Misc. - - 100 +25 - - - - 1
Living room Capacity Charisma - 100 +25 500 1500 2*S/3*(L+4)-2 - 3 - 9
Power generator Production Strength - 100 +25 500 1500 25*S*(L+1) 3*S*L+15*2^(S-1)*-8*(S-1)-9+? 3 - 9
Diner Production Agility - 100 +25 500 1500 25*S*(L+1) (2*S*(L+4))-2 3 - 9
Water treatment Production Perception - 100 +25 500 1500 25*S*(L+1) (2*S*(L+4))-2 3 - 9
Storage room Capacity Endurance 12 300 +75 750 1500 5*S*(L+1) - 3 - 9
Medbay Production Intelligence 14 400 +100 1000 3000 10*S 3 - 9
Science lab Production Intelligence 16 400 +100 1000 3000 10*S 3 - 9
Overseer's office Quests - 18 1000 - 3500 15000 - - 6
Radio studio Production Charisma 20 600 +150 1500 4500 - - 3 - 9
Weapon workshop Crafting - 22 800 +600 8000 60000 - - 9
Weight room Training Strength 24 600 +150 1500 4500 - - 3 - 9
Athletics room Training Agility 26 600 +150 1500 4500 - - 3 - 9
Armory Training Perception 28 600 +150 1500 4500 - - 3 - 9
Classroom Training Intelligence 30 600 +150 1500 4500 - - 3 - 9
Outfit workshop Crafting - 32 1200 +900 12000 90000 - - 9
Fitness room Training Endurance 35 600 +150 1500 4500 - - 3 - 9
Lounge Training Charisma 40 600 +150 1500 4500 - - 3 - 9
Theme workshop Theme - 42 3200 +2400 16000 120000 - - 9
Game room Training Luck 45 600 +150 1500 4500 - - 3 - 9
Barbershop Misc. Charisma 50 10000 +5000 50000 - - - 6
Nuclear reactor Production Strength 60 1200 +300 3000 9000 100*S*(L+1) ~1.3*(3*S*L+15*2^(S-1)*-8*(S-1)-9+?) 3 - 9
Garden Production Agility 70 1200 +300 3000 9000 25*S*(L+1) ? 3 - 9
Water purification Production Perception 80 1200 +300 3000 9000 25*S*(L+1) ? 3 - 9
Nuka-Cola bottler Production Endurance 100 3000 +750 15000 45000 50*S*(L+1) ? 3 - 9

* S = room size
* L = room level

The game begins with a Stimpak and RadAway capacity of 5.

The cost of each new room is dependent on the number of rooms of that type already in the vault. For example, the first Medbay costs 400 caps, the second costs 500 caps, and so on.

Production rooms[]

Production rooms periodically yield one resource, except for the Nuka-Cola bottler, which produces both food and water. Production time is dependent on the assigned Dwellers' total trait level for the room's required trait. For example, four Dwellers with Strength 5 in a double-generator room are as productive as 2 Dwellers with Strength 10 in the same room. Production times are also modified by the room's size, upgrade level, and the working Dwellers' happiness. Although it is not visible in their SPECIAL stat bars, wearing outfits that raises traits beyond 10 increases production rates. Once a room has produced a batch of its resource, it will not produce any more until that resource is collected. Depending on the luck of the workers, collecting the resource may also yield a sum of caps.

Room time[]

Resource rooms operate with a hidden time pool (hereafter simply referred to as "pool"). Every second all working Dwellers in the room add their relevant SPECIAL stat to that pool, increased by the vault's happiness bonus. When the pool is full the room is ready for the player to harvest its resource, after which the pool is emptied and the Dwellers need to fill it up again. When a room is merged the pool size is increased to match the new room size. So the pool in a double room is twice the size of a single room, and a triple room thrice the size of a single. Upgrading the room seems to have no noticeable effect on a room's pool size. If a Dweller is moved out of the room then the points they've accumulated remain with the room's pool.

In a single-room power plant, a Dweller with 5 Strength will add 5 points to the pool every second, plus any vault happiness boosts. Power rooms seem to have a pool size of 1320 (which is 22 minutes in seconds), however this single Dweller will fill up the room's pool in exactly 4 minutes. If the room were to be merged and no new Dwellers were added, the room's total pool size would be doubled to 2640 (44 minutes) and it would take that same Dweller 8 minutes to fill up the time pool.

The pool sizes for most rooms have been estimated as follows:

Room Pool Size Base Time (in minutes)
Power Plant 1320 22
Nuclear Reactor 1800 30
Diner 960 16
Water Treatment 960 16
Garden 1200 20
Water Purifier 1200 20
Bottler 1200 20
MedBay 2400 40
Science Lab 2400 40
Radio Station ?? ??


Bigger is better in this case. Some rooms are more efficient while actively playing (clicking more often); others are more efficient while running in the background. A clear example is the radio room. Although you would think making one 3-room radio is the best way to do it, it is not because if one logs in after 24 hours, the single room has stopped at 1 citizen, but three 1-room radio rooms give you 3 citizens after 24 hours.

Why resource*1000/(time*skill)? Because if we increase skill then resources are also increased proportionally. Values are shown for skill 1 workers. 1000 is used because numbers are quite small.

Room Produces Efficiency Quantity* Base time**
Power generator Power 8.26 10 20minutes 11seconds
Diner Food 9.17 8 14m32s
Water treatment Water 9.17 8 14m32s
Nuclear reactor (best) Power 9.08 13 23minutes 51seconds
Garden Food 10.09 10 16m31s
Water purification Water 10.09 10 16m31s
Nuka-Cola bottler (best) 1/2*Food+1/2*Water 20.18 20 16m31s
Power generator 3room fully upgraded Power 20.75 66 1hour 3minutes
Nuclear reactor 3room fully upgraded (best) Power 22.49 85 1hour 13minutes

* Quantity is for logging out and resuming after room has finished production (for people who don't care about efficiency while playing, but login, collect resources, and logout.)
** Base time, 10% vault happiness and 1 strength/agility/perception/endurance ( taking a Dweller away from a room does not restart the timer, it will continue where it left off.)

The above table is for a first tier 1-room. Multiply Quantity and Efficiency with the numbers below to get these values for other configurations:

Single Room Double Room Triple Room
Tier 1 1.0 2.1 4.4
Tier 2 1.2 2.5 5.2
Tier 3 1.5 3.1 6.6

You can also apply this formula:

where R is the number of rooms merged together and T the Tier of the room.

This page has not been updated in quite some time, recently noticed the numbers are a bit off above:

Raw data
at 20170719 in a vault with 92 happiness(+10%bonus), a 1 strenght 100happy sweller on a fully upgraded 3room Power generator yields 66power in 1hour and 3minutes, while in fully upgraded 3room Nuclear reactor yields 85power in 1hour 13minutes. Which should mean efficiency of 20.755 and 22.486, ie Nuclear reactor is 10% better at efficiency.
at 20170719 in a vault with 95 happiness(+10%bonus), a 1 strenght 100happy sweller on a not upgraded 1room Power generator yields 10power in 20minutes and 11seconds, while in fully upgraded 3room Nuclear reactor yields 13power in 23minutes and 51seconds. Which should mean efficiency of 9.085 and 8.258, ie Nuclear reactor is 10% better at efficiency.
at 20170720 in a vault with 97 happiness(+10%bonus), dinner and water treatment produced both 8 in 14m32s and garden and water purification both 10 in 16m31s and nuka produced 10+10 in 16m31s meaning 9.174, 10.091, 20.182.
more hidden content

Rush production[]

Production rooms can "rush" to produce resources quickly. Depending on the probability given in-game, the room can instantly yield resources, experience and a number of caps equal to the percentage of the chance taken. A failed rush attempt leads to an inevitable incident in that room; this may be a fire or an infestation of Radroaches, Mole Rats, or Radscorpions. Each attempt to rush production, whether successful or not, raises the chances of failure in the next rush. The room's rush penalty slowly decays over time. The total chances to fail a rush in a specific room is affected by the luck and the traits of the workers and the room's current rush penalty. With a successful rush attempt, all workers of a room gain a total of 10 points of happiness over the next 30 seconds. A failed rush attempt lowers the workers happiness by 10 points. Only workers that stay in a room during the entire 30 seconds after the rush will receive the full bonus/penalty.

Pregnant characters will flee the room in the case of any incident, including incidents caused by a failed rush.

It is possible to cap the rush failure chance below 50% with high luck and matching SPECIAL statistics of the workers. At this point, the rush failure chance will alternate between 50% and 40%. If you don't have high luck, the alternating seems to max out at 86% and 74%.

If your goal is to:

  • Produce resources: build merged upgraded rooms
  • Produce caps: build multiple small, non-upgraded rooms
  • Successfully rush rooms for the quests: build multiple small, non-upgraded rooms
  • Have capacity: you don't need to upgrade (or even staff if you don't want to) the Medbay or Science Labs. You don't get extra capacity from upgrading.

Training rooms[]

These types of rooms raise one of the traits for the Dwellers stationed in it. Dwellers appear to "remember" partial training, so there is no penalty to pulling a Dweller out of the Gym to temporarily provide some spare power. Training is an important mechanic to improving the effectiveness of your Dwellers both in the Vault and in the Wasteland.

Training times[]

Similar to Production rooms, Dwellers have a point pool for each of their stats. When this pool fills up the player can level up the appropriate stat. Training time depends on how large the pool is and how fast the Dweller can fill the pool.

Training Pool
Skill point Pool Size Base Time Pool to max Time to Max
1 1800 00:30 297000 3::10:30
2 5400 01:30 295200 3::10:00
3 10800 03:00 289800 3::08:30
4 18000 05:00 279000 3::05:30
5 27000 07:30 261000 3::00:30
6 37800 10:30 234000 2::17:00
7 50400 14:00 196200 2::06:30
8 64800 18:00 145800 1::16:30
9 81000 22:30 81000 0::22:30

When training, a Dweller adds one point to the pool every second, amplified by the Vault's happiness bonus, the number of Dwellers in the room, and the upgrade level of the room.

Pool size of Skill points per level

Where SP is the Skill Point of Dwellers (1 ~ 9)

Points per second

Where D is the number of Dwellers training in the room (1 ~ 6)
T is the tier of the training room (1 ~ 3)
H is the Vault happiness bonus (0.01~0.1)

Since the minimum bonus from the vault's happiness is 1.01, Dwellers will always train at least slightly faster than the listed base time. Normally this can take roughly 3 days 10 hours. However, Dwellers can increase their points per second up to 1.331, which can reduce up to 25% of the time needed to train (training at 4/3 times speed reduces the base time to 3/4) and reducing the total training time to 2 days 12 hours 52 minutes and 36 seconds.

Merged rooms[]

A maximum of three rooms of the same type can be merged to one bigger room. Rooms are automatically merged by placing a room of the same type next to an existing room of tier 1. If placed next to a room of higher level, the new room will be merged as soon as it is upgraded to the level of the existing room. All beneficial effects of the two rooms are accumulated upon merge: a double training room will train up to four Dwellers, a triple training room up to six.

Merged rooms have advantages compared to the same number of unmerged rooms. Upgrading merged rooms costs less than the cumulative upgrade costs of the same number of unmerged rooms, so consider merging rooms to triples before upgrading them. Also, merged rooms are more productive and effective: production rooms will generate resources faster while training rooms can hold more Dwellers, which reduces training times.

However, merged rooms have downsides: the bigger the room is and the less it is occupied, the harder it will be to clear an incident like Radroaches or fire, depleting your Dwellers' health. Tier also influences the difficulty; the higher the tier, the longer the incident will be. Keep this in mind before trying to rush production.

A fully occupied merged room can be deadly to invaders if your Dwellers are well trained and fully equipped. Make sure the two first floors contain fully merged rooms with trained Dwellers to take out most of the intruders.

Mysterious Stranger[]

MysteriousStranger HD Water

Mysterious Stranger in a water treatment station

Randomly, a Mysterious Stranger will appear in a room for a short time accompanied by an audio cue which is louder depending on his distance from your view or a double buzz when on silent. When clicked, the Stranger disappears and you are awarded a random number of caps ranging from a few dozen to slightly less than 5,000. The Stranger can appear in any room including empty rooms, elevators and the vault entrance, but will not appear during a crisis and will disappear if a crisis occurs while he's in the vault. If you do not click the Stranger in time, another sound will play or a single buzz when on silent and he will disappear without awarding you any caps.

The success animation changes depending on the number of caps received - for up to 500 caps it is a stream that rushes across the screen to the upper right corner; anything above this threshold manifests as a brief rain of caps across the entire screen.

MysteriousStranger Radio

The Mysterious Stranger appearing in a radio studio while zoomed out

While the number of caps the Stranger awards become less and less significant in later game stages, they are very valuable during the beginning and can greatly speed up a fledgling vault's establishment, especially since the Stranger is much easier to find during the early stages of the game. As the vault grows, it becomes harder to search quickly and more difficult to find the Mysterious Stranger in time. However, by zooming out to the furthest level and disabling HD Zoom Out in Settings he becomes easier to spot.

Certain pets can increase the frequency of the Stranger's appearance by a considerable margin, to the point that he appears every couple of minutes.

Rooms in Fallout Shelter