How to increase Garrison Size in CK3

Defender of the Faith+20%

Theocracy governments

defender_of_the_faith_perk · game/common/lifestyle_perks/00_learning_3_theology_tree_perks.txt

On the Road+20%

Not Adventurer government

defensive_measures_perk · game/common/lifestyle_perks/00_stewardship_2_domain_tree_perks.txt

Stalwart Defenders+25%

Provinces of this culture

tradition_stalwart_defenders · game/common/culture/traditions/00_combat_traditions.txt

Land of the Bow+25%

Provinces of this culture

tradition_land_of_the_bow · game/common/culture/traditions/00_maa_traditions.txt

Legendary Watchtower+200%

Province

legendary-watchtower · game/common/buildings/00_legendary_buildings.txt

Great Barracks+150%

Each de jure county of the duchy

celestial-great-barracks · game/common/buildings/tgp_great_project_buildings.txt

Marches+100%

Each de jure county of the duchy

Levels 1–3: +25% to +100% (3 levels give it)

march · game/common/buildings/00_duchy_capital_buildings.txt

Doge's Palace+100%

Province

doges-palace · game/common/buildings/00_special_buildings.txt

The Theodosian Walls+100%

Province

theodosian-walls · game/common/buildings/00_special_buildings.txt

Pemba Trade Ports+100%

Province

swahili-port-pemba · game/common/buildings/00_special_buildings.txt

Port of Mombasa+100%

Province

swahili-port-mombasa · game/common/buildings/00_special_buildings.txt

Saint Peter's Basilica+100%

Province

holy-site-st-peters-basilica · game/common/buildings/cp6_special_buildings.txt

Walls of Benin+50%

Province

walls-of-benin · game/common/buildings/00_special_buildings.txt

The Aurelian Walls+50%

Province

aurelian-walls · game/common/buildings/00_special_buildings.txt

Capital Temple Complex+50%

Province

Levels 1–4: +15% to +50% (4 levels give it)

mandala-capital · game/common/buildings/tgp_great_project_buildings.txt

Capital Temple Complex+50%

County

mandala-capital · game/common/buildings/tgp_great_project_buildings.txt

Walls of Genoa+25%

Province

walls-of-genoa · game/common/buildings/00_special_buildings.txt

Visby Ringmur+25%

Province

visby-ringmur · game/common/buildings/00_special_buildings.txt

City Walls of Toledo+25%

Province

city-wall-of-toledo · game/common/buildings/00_special_buildings.txt

Great Wall of Gorgan+25%

Province

great-wall-of-gorgan · game/common/buildings/00_special_buildings.txt

Trosky Castle+25%

Province

trosky-castle · game/common/buildings/00_special_buildings.txt

Kassiopi Castle+20%

Province

kassiopi-castle · game/common/buildings/00_special_buildings.txt

Patras Castle+20%

Province

patras-castle · game/common/buildings/00_special_buildings.txt

Walls of York+20%

Province

york-walls · game/common/buildings/ccp3_special_buildings.txt

Kano Earthworks+20%

Province

kano-walls · game/common/buildings/ccp3_special_buildings.txt

Visegrad Citadel+20%

Province

visegrad-castle · game/common/buildings/ccp3_special_buildings.txt

Golden Fort+20%

Province

jaisalmer-fort · game/common/buildings/ccp3_special_buildings.txt

Roman Walls of Lugo+10%

Province

roman-wall-of-lugo · game/common/buildings/00_special_buildings.txt

Troglodytic Settlements+10%

Province

fairy-chimneys · game/common/buildings/00_special_buildings.txt

Quarries+10%

County

Levels 6–8: +10% to +10% (3 levels give it)

quarries · game/common/buildings/00_standard_economy_buildings.txt

Cattle Pastures+5%

Province

Levels 5–8: +5% to +5% (4 levels give it)

pastures · game/common/buildings/00_standard_economy_buildings.txt

Outposts+5%

County

Levels 5–8: +5% to +5% (4 levels give it)

outposts · game/common/buildings/00_standard_military_buildings.txt

Barracks+4%

County

Levels 5–8: +1% to +4% (4 levels give it)

barracks · game/common/buildings/00_standard_military_buildings.txt

Ritsuryō-50%

Rulers with this government

japan_administrative_government · game/common/governments/01_japan_government_types.txt

Sōryō-50%

Rulers with this government

japan_feudal_government · game/common/governments/01_japan_government_types.txt