The top of the construction menu in Hearts of Iron IV.
Game: Hearts of Iron IV
Content Type: Gaming Guides


Throughout Hearts of Iron IV, the player is bound to construct something at some point. Whether its repairing vital infrastructure or expanding your production capacity, construction is a vital mechanic to utilize throughout your campaigns.

Construction is a mechanic in Hearts of Iron IV that is responsible for the building and repairing of buildings within your states and provinces. It is driven by the number of civilian factories in your country, as these determine how fast construction occurs. A maximum of 15 civilian factories can be assigned to a construction project at once, with any excess factories being free to assign to other projects.

Within each state are a number of provinces in Hearts of Iron IV. While most buildings are constructed at a state level, some are constructed within individual provinces.

The Province Buildings menu in Hearts of Iron IV.

Forts are excellent for shoring up the defenses on your borders or preparing fallback lines if you are being invaded. Two types of forts exist in the game, land forts and coastal forts. They each provide a 15 percent combat bonus for each level of fort in a province, with a maximum level of 10. These are invaluable if you are a minor power near a major, or if you share a tiny border with a potential enemy.

The other type of provincial buildings are naval bases. These bases increase the supply to an area and house your fleets when they are not on missions. Building these should be a priority if you plan to rapidly expand your fleet. They should also be built when you are doing an extensive naval invasion, such as one of North America. Without a high level naval base, it is possible your troops run out of supplies and your invasion gets stalled.

These buildings provide benefits throughout an entire state instead of the single province. State buildings can provide bonuses related to both projecting power and defending your land.

The Infrastructure Buildings menu in Hearts of Iron IV.

Without air bases, you might as well not have an air force. Each level of air base provides an additional 200 capacity for planes, and these also extend where you can deploy your air force. Bases placed close to an enemy border can be risky, but they will let your planes fly further into their territory.

If somebody has multiple air bases near your border, you should consider investing into some anti-air guns. These will damage any enemy planes flying over the state and reduce the effectiveness of bombing runs.

Radar stations are invaluable for collecting intelligence. With them you can expect more knowledge of enemy land forces, better effectiveness at countering aerial attacks, and increased knowledge of any enemy ships at sea.

Both in Hearts of Iron IV and real life, infrastructure is the backbone of any country. High level infrastructure increases the supply available to nearby units and improves their movement speed in the entire state. In addition to those benefits, it will increase the building speed of our next category, shared buildings.

The most impactful buildings in the game have to be shared buildings. These include your production buildings, oil storage, and missile silos. Shared buildings get their names due to them sharing the same building slots in a state. For example, if a state has a maximum of 8 buildings, then you can have a total of 8 of the buildings below.

The Shared Buildings menu in Hearts of Iron IV.

Production buildings are responsible for construction, creating weapons, and building ships for your navy. These include civilian factories, military factories, and naval dockyards. They all have a maximum level of 20, but you realistically will have a hard time getting close to that with the building limits of states.

Civilian factories are unique as production buildings because they are responsible for building the other production buildings. In addition to this, they are used for intelligence agencies and trading. Thanks to the extensive uses of civilian factories, you should prioritize building these before other buildings in a state.

This category includes your synthetic refineries and your fuel silos. Synthetic refineries produce oil and rubber, which are very valuable for waging war. Refineries are critical to use if you don’t have easy access to oil. Fuel silos store the fuel, with each one increasing your countries maximum fuel storage capacity. Location does not matter with either of these, as the benefits are felt throughout your entire country.

Towards the end of the game, players unlock the ability to build both guided missiles and nuclear bombs. Rocket sites will produce one rocket per day, while nuclear reactors will slowly create nuclear bombs. Due to how late in the game these are unlocked, they usually have limited use, especially for experienced players.

Rockets function as planes, so they have limited range and building sites on the border of potential enemies is crucial. You will need multiple nuclear reactors to efficiently construct bombs, as well as a powerful air force to escort them to their target.

A nuclear detonation in Hearts of Iron IV.

To successfully dominate in Hearts of Iron IV, utilizing every building type will be essential. Knowledge of buildings will help when you have inactive civilian factories, and when you are prioritizing targets in your next invasion.

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