Duchy buildings

Crusader Kings III

Buildings

Duchy buildings

Economic buildings

Military buildings

Special buildings

Tribe buildings

Fort buildings

Duchy buildings can only be constructed by a feudal or clan ruler in the de jure capital of a  Duchy and can only be used if the character holds the associated duchy title. Note that all duchy buildings may be built in any terrain, apart from royal reserves. All duchy buildings take 5 years to construct or upgrade and have 3 levels.

• Initial construction (level 1) costs 300 gold
• Upgrading to level 2 costs 400 gold
• Upgrading to level 3 costs 500 gold

Archery grounds

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“ Dedicated archery ranges allow the common folk to train with bows, and experienced archers to hone their skills. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Realm −6% Men-at-Arms Maintenance +15% Archer Damage +5% Archer Toughness +10% Skirmisher Damage +5% Skirmisher Toughness +10% Skirmisher Pursuit +5% Skirmisher Screen	Realm −8% Men-at-Arms Maintenance +30% Archer Damage +10% Archer Toughness +20% Skirmisher Damage +10% Skirmisher Toughness +20% Skirmisher Pursuit +10% Skirmisher Screen	Realm −10% Men-at-Arms Maintenance +45% Archer Damage +15% Archer Toughness +30% Skirmisher Damage +15% Skirmisher Toughness +30% Skirmisher Pursuit +15% Skirmisher Screen

Level	Name	Internal ID	Description
1	Archery Ranges	archery_ranges_01	Everyone is welcome at the archery range, regardless of if you're wealthy or poor. The reason is twofold; peasants that can fire a bow are more useful in war, and experienced marksmen keep themselves in top shape when they can compete in tournaments.
2	Royal Bowyers	archery_ranges_02	The best bowmakers are employed by the crown, and set to craft the highest-quality bows they can in facilities specifically constructed for the task.
3	Marksman's Ranges	archery_ranges_03	To inspire the peasantry and provide ample challenge for our marksmen, these special ranges are designed to train our archers in long-distance archery.

Blacksmiths

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“ Smiths in the employ of the crown forge weapons and armor for the royal guard, ensuring a steady supply of superior armaments. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Realm −6% Men-at-Arms Maintenance +5% Heavy Infantry Damage +15% Heavy Infantry Toughness +5% Spearmen Infantry Damage +15% Spearmen Infantry Toughness	Realm −8% Men-at-Arms Maintenance +10% Heavy Infantry Damage +30% Heavy Infantry Toughness +10% Spearmen Infantry Damage +30% Spearmen Infantry Toughness	Realm −10% Men-at-Arms Maintenance +15% Heavy Infantry Damage +45% Heavy Infantry Toughness +15% Spearmen Infantry Damage +45% Spearmen Infantry Toughness

Level	Name	Internal ID	Description
1	Crown Smithies	blacksmiths_01	The best and most productive smiths are employed by the crown and set to produce swords, mail and pikes for the royal guard.
2	Blacksmith's Guilds	blacksmiths_02	By collaborating with the various guilds, large amounts of gear can be made cheaply on order.
3	Royal Forges	blacksmiths_03	Large forges are constructed for the sole purpose of supplying the crown with weapons, only the best smiths are employed to work therein.

Jousting grounds

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“ By having dedicated grounds for jousting, more riders and knights are encouraged to train and join the banners. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Realm −6% Men-at-Arms Maintenance +10% Light Cavalry Damage +10% Light Cavalry Toughness +10% Light Cavalry Pursuit +10% Light Cavalry Screen +10% Heavy Cavalry Damage +10% Heavy Cavalry Toughness	Realm −8% Men-at-Arms Maintenance +20% Light Cavalry Damage +20% Light Cavalry Toughness +20% Light Cavalry Pursuit +20% Light Cavalry Screen +20% Heavy Cavalry Damage +20% Heavy Cavalry Toughness	Realm −10% Men-at-Arms Maintenance +30% Light Cavalry Damage +30% Light Cavalry Toughness +30% Light Cavalry Pursuit +30% Light Cavalry Screen +30% Heavy Cavalry Damage +30% Heavy Cavalry Toughness

Level	Name	Internal ID	Description
1	Jousting Fields	jousting_lists_01	A clearing is kept open year-round to facilitate the training of riders and knights.
2	Tournament Grounds	jousting_lists_02	With jousting lists and stands for the public, these tournament grounds attract a huge amount of contestants.
3	Royal Tournament Arenas	jousting_lists_03	Upgraded with seats for royal guests and a larger fairground, the tournament arena is truly impressive.

Leisure palaces

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“ While staying in one lavishly luxuriant castle is fine, having a few more to choose between never hurts. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Manorialism	Windmills	Cranes
Effects	Duchy +0.2 Monthly Control +20% Monthly Control Realm +5% Monthly Prestige +15% Stress Loss +5 Hostile Scheme Success Chance +5 Personal Scheme Success Chance	Duchy +0.3 Monthly Control +40% Monthly Control Realm +10% Monthly Prestige +25% Stress Loss +10 Hostile Scheme Success Chance +10 Personal Scheme Success Chance	Duchy +0.4 Monthly Control +60% Monthly Control Realm +15% Monthly Prestige +35% Stress Loss +15 Hostile Scheme Success Chance +15 Personal Scheme Success Chance

Level	Name	Internal ID	Description
1	Chateau	leisure_palace_01	When the burdens of responsibility become too much (or an angry mob of peasants is storming the gates), there's no place like the rural, far-away chateau for some impromptu relaxation!
2	Summer Palace	leisure_palace_02	The summer palace is located in a scenic part of the duchy, far away from the menial lives of our toiling subjects. There's truly no better way to display royal power and prestige, and the simple fact that we are better than everyone else.
3	Winter Palace	leisure_palace_03	The winter palace is designed to house the royal family during the harsher months of the year. With a well-stocked larder and a defensible position, it towers over any shivering subjects that have the privilege to work nearby.

Marches

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“ Marcher lords protect the borders with fortifications and local garrisons. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Duchy +1 Fort Level +4 Defender Advantage +25% Supply Limit +25% Garrison Size +25% Levy Reinforcement Rate +20% Hostile Raid Time	Duchy +2 Fort Level +6 Defender Advantage +50% Supply Limit +50% Garrison Size +50% Levy Reinforcement Rate +30% Hostile Raid Time	Duchy +3 Fort Level +8 Defender Advantage +100% Supply Limit +100% Garrison Size +100% Levy Reinforcement Rate +40% Hostile Raid Time

Level	Name	Internal ID	Description
1	Strategic Marches	march_01	Marches are constructed in the most vulnerable and remote areas of the duchy, protecting against attacks. While few and far between, they serve as a useful warning system, and also catch the occasional smuggler.
2	Border Marches	march_02	The system of marcher lords are expanded along the entire border, providing further defense.
3	Grand Marches	march_03	Large march fortifications are constructed all over the duchy, significantly hampering any attacking force.

Military academies

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“ Dedicated facilities for training officers and knights, improving their efficiency in combat. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Realm −2% Army Maintenance +2 Number of Knights +25% Knight Effectiveness	Realm −3% Army Maintenance +4 Number of Knights +50% Knight Effectiveness	Realm −5% Army Maintenance +6 Number of Knights +75% Knight Effectiveness

Level	Name	Internal ID	Description
1	Military Schools	military_academy_01	Aspiring officers are vetted based on merit in the military school. Naturally, the school only accepts students of a noble pedigree.
2	Officer's Academies	military_academy_02	Sergeants put through the academy will have a greater understanding of the battlefield, or at the very least know how to properly grovel before their superiors.
3	Grand Military Academies	military_academy_03	This duchy hosts a grand military academy, where local military officers are put through rigorous training.

Royal armories

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“ By having the crown provide weapons and armor to its soldiers, more peasants can 'volunteer' for the levy. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Duchy +20% Levy Size	Duchy +30% Levy Size	Duchy +40% Levy Size

Level	Name	Internal ID	Description
1	Weapon Depots	royal_armory_01	In times of war, peasant levies can be assigned a weapon from the depot. It's mostly rusty old axes, broken spears and the occasional club with a nail driven through it. Regardless, it's better than going into battle with your bare fists!
2	Crown Armories	royal_armory_02	Armories run by the crown collect and maintain weapons and armor for use in war. These are of decent quality, and can turn any drunk layabout into an at-least-to-the-eye competent soldier in no time!
3	Royal Arsenal	royal_armory_03	The royal arsenal not only contains an impressive amount of weapons, it also hosts blacksmiths that forge new gear. While it might be a waste to equip mere peasants with these armaments, they also attract local adventurers who would love nothing more than to fight and die for us should they get one of the swords...

Royal reserves

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“ A royal forest is a valuable source of wealth, allowing you to override the law of the land in a province, strip rights from the locals, then sell them back. Needless to say, the hunting is also excellent. — In-game description ”

This building can only be built in the following terrain:

Terrain	Able to construct
Desert	—
Desert Mountains	—
Drylands
Farmlands
Floodplains
Forest
Hills
Jungle
Mountains	—
Oasis	—
Plains
Steppe	—
Taiga
Wetlands	—

	Level 1	Level 2	Level 3
Requirements	Manorialism	Windmills	Cranes
Effects	Duchy +5 Popular Opinion +10% Monthly Development Holding +0.8 Monthly Tax	Duchy +10 Popular Opinion +20% Monthly Development Holding +1.1 Monthly Tax	Duchy +15 Popular Opinion +30% Monthly Development Holding +1.4 Monthly Tax

Level	Name	Internal ID	Description
1	Royal Forests	royal_forest_01	Large areas of forest in this duchy are reserved for use by the royal family. Peasants are prohibited from living in the forest, hunting any of its animals or clearing trees for agriculture. Attacking the crown's tax assessors as they're passing by is especially prohibited.
2	Vast Crown Forests	royal_forest_02	Entire towns are now subsumed by this royal forest, and nearby settlements often find that the monarch's men have 'discovered' maps placing their dwellings firmly inside the local crownswood.
3	Crownswood Courts	royal_forest_03	Law is only as good as the system that backs it up, and now this royal forest has an entire system of courts, wardens, and clerks, backed up by trained magistrates, all ready to enforce the diktats of the crown.

Siege works

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“ Dedicated siege works allow the ruler to field and maintain superior-quality siege weapons. — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Burhs	Castle Baileys	Royal Armory
Effects	Duchy +1 Fort Level Realm +20% Siege Weapon Effectiveness +2 Siege Weapon Toughness	Duchy +2 Fort Level Realm +30% Siege Weapon Effectiveness +4 Siege Weapon Toughness	Duchy +3 Fort Level Realm +40% Siege Weapon Effectiveness +6 Siege Weapon Toughness

Level	Name	Internal ID	Description
1	Siege Workshops	siege_works_01	Siege workshops provide a place to assemble and try out various kinds of siege weapons.
2	Trebuchet Engineers	siege_works_02	A dedicated cast of engineers works tirelessly to ensure that our trebuchets can fling 90 kilogram stone projectiles over 300 meters.
3	Cannon Foundries	siege_works_03	The siege foundries allow for rapid casting and readying of cannons.

Tax offices

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“ Collecting money from the peasantry is a 'taxing' venture. By assigning offices to a cohort of tax-collecting officials, we are sure to get what's due! — In-game description ”

	Level 1	Level 2	Level 3
Requirements	Manorialism	Windmills	Cranes
Effects	Duchy +10% Holding Taxes	Duchy +15% Holding Taxes	Duchy +20% Holding Taxes

Level	Name	Internal ID	Description
1	Tax Assessors	tax_assessor_01	It is every peasant's duty to pay the crown a proportionate tax in coin or produce. Our tax assessors ensure that what they pay is sufficiently 'proportionate' for our needs, and fortunately for us most peasants are illiterate.
2	Bailiff's Office	tax_assessor_02	An excellent way to make sure that peasants pay their taxes is the threat of being thrown in the dungeon should they not. This is the job of the bailiff, ever on our side!
3	Magistrate's Court	tax_assessor_03	While peasants might be easy to tax, the wealthier landholders are harder to coerce. By establishing a complex administrative web run by loyal magistrates, we can ensure that even the richest of our subjects pay their dues.