Hearts of Iron IV

Hearts of Iron IV

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bossman Jun 26, 2016 @ 9:40am
How to unlock more building slots?
So if you click on a province you can see how many building slots for industry etc. you have avaible and you can also see locked slots. But how do you actually unlock those locked slots as there is a maximum of 25 slots to build in?
Last edited by bossman; Jun 26, 2016 @ 9:40am
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EthanT Jun 26, 2016 @ 9:43am 
Upgrade your Industrial Research (Each one gives +20% factory limit)
Sinclair Jun 26, 2016 @ 9:44am 
With research options, which is located in the industry tab of the research window.
also some national focuses can increase them i think, but i'm not 100% sure about this.
[NL]Ibahalii Jun 26, 2016 @ 9:57am 
To add to previous statements,
It also increase by population, this ofcourse take a lot of time(as pop only grows 0.12% per year).
But at certain treshholds the population increase is big enough to add a extra slot.
Industry can increase the amount of slots, and National focus can do the same, and is useally in line where you get the option to modernise the country a bit more.
where you will see in the tooltip something like:
adds 2 factories to *insert province name*.
adds 2 building slots to *insert province name*
bossman Jun 26, 2016 @ 10:24am 
Okay thanks!
im playing as turkey, with armament effort, it says it would add 1 building slot, it's finished and it hasn't...
Kaiser Nov 22, 2017 @ 11:22am 
Originally posted by PAPike:
im playing as turkey, with armament effort, it says it would add 1 building slot, it's finished and it hasn't...
it probably adds a building to go w/ it
bubbas Nov 22, 2017 @ 11:23am 
Originally posted by NLIbahalii:
It also increase by population, this ofcourse take a lot of time(as pop only grows 0.12% per year).
But at certain treshholds the population increase is big enough to add a extra slot.
Not correct. Maybe with some mods but not in vaniilla.
Fistface Feb 9, 2018 @ 10:47pm 
Originally posted by NLIbahalii:
To add to previous statements,
It also increase by population, this ofcourse take a lot of time(as pop only grows 0.12% per year).
But at certain treshholds the population increase is big enough to add a extra slot.
Industry can increase the amount of slots, and National focus can do the same, and is useally in line where you get the option to modernise the country a bit more.
where you will see in the tooltip something like:
adds 2 factories to *insert province name*.
adds 2 building slots to *insert province name*

I completed Construction Effort III which was supposed to give me two extra factory slots. I can't actually build any more factories though. So that appears to have been a waste of time. I'm playing as Australia. I have 70K manpower.
Leon Declis Feb 10, 2018 @ 2:13am 
Originally posted by Fistface:
Originally posted by NLIbahalii:
To add to previous statements,
It also increase by population, this ofcourse take a lot of time(as pop only grows 0.12% per year).
But at certain treshholds the population increase is big enough to add a extra slot.
Industry can increase the amount of slots, and National focus can do the same, and is useally in line where you get the option to modernise the country a bit more.
where you will see in the tooltip something like:
adds 2 factories to *insert province name*.
adds 2 building slots to *insert province name*

I completed Construction Effort III which was supposed to give me two extra factory slots. I can't actually build any more factories though. So that appears to have been a waste of time. I'm playing as Australia. I have 70K manpower.

Ah, you've misunderstood.

Building Slots are things like "Military Factories", "Oil Refineries", etc.

Infrastructure is the little "Railway" slot, such as supply, moving units, letting units recover. You need to build this up if you want an area to develop.


Originally posted by Ad0lf:
im playing as turkey, with armament effort, it says it would add 1 building slot, it's finished and it hasn't...

See above; the game isn't very clear, but Infrastructure simply means how much you can develop an area (using the railway building).

Originally posted by Eranuzz:
So if you click on a province you can see how many building slots for industry etc. you have avaible and you can also see locked slots. But how do you actually unlock those locked slots as there is a maximum of 25 slots to build in?

Some technologies and national focuses can increase this. Generally speaking though, once you've maxed out an area, it's maxed out. Time to conquer new lands. The wiki has a pretty map which shows you the areas which can develop more. Basically, Japan, some parts of China, Europe, American coasts.
cogemizs Aug 17, 2023 @ 12:12pm 
Originally posted by Leon Declis:
Originally posted by Fistface:

I completed Construction Effort III which was supposed to give me two extra factory slots. I can't actually build any more factories though. So that appears to have been a waste of time. I'm playing as Australia. I have 70K manpower.

Ah, you've misunderstood.

Building Slots are things like "Military Factories", "Oil Refineries", etc.

Infrastructure is the little "Railway" slot, such as supply, moving units, letting units recover. You need to build this up if you want an area to develop.


Originally posted by Ad0lf:
im playing as turkey, with armament effort, it says it would add 1 building slot, it's finished and it hasn't...

See above; the game isn't very clear, but Infrastructure simply means how much you can develop an area (using the railway building).

Originally posted by Eranuzz:
So if you click on a province you can see how many building slots for industry etc. you have avaible and you can also see locked slots. But how do you actually unlock those locked slots as there is a maximum of 25 slots to build in?

Some technologies and national focuses can increase this. Generally speaking though, once you've maxed out an area, it's maxed out. Time to conquer new lands. The wiki has a pretty map which shows you the areas which can develop more. Basically, Japan, some parts of China, Europe, American coasts.
¿Hay un truco paa poner más ranuras o espacios de fábricas?
okay a lot weird things being said here

so the base numver of building slots is based on "development level", generally this cannot be changed ever, only in the ethipian focus tree i think has a means to increase the development level of a state

in simple terms, is the state a barren wasteland, or a massive city?
it ranges from 0 slots base, to 12 base, respectively

each industrial tech will give 20% more slots, rounded down

by filling out the infrastructure of a state, you can spend 100 PP to get 1 extra slot
while at war you can spend 50PP and stability+war support for 1 extra slot in a random state

population has zero effect in the vanilla unmodded game

the focuses like construction effort 3 in the generic tree gives you free slots AND instantly fills those slots with new factories, so don't worry about that too much
Steve Aug 17, 2023 @ 2:25pm 
This thread was quite old before the recent post, so we're locking it to prevent confusion.
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Date Posted: Jun 26, 2016 @ 9:40am
Posts: 12