Improvements

Improvements are purchased from various buildings to give permanent bonuses for the current mission. Citadel improvements are not available in Endless mode, where Military Capacity is instead unlocked using points.

Improvement	Effects	Cost	Time (seconds)	Building	Prosperity Level
Basic Dormitory	+5 Military Capacity	180 Oxygen 25 Wood 5 Minerals	42	Citadel	I
Leather Bow Grip	+4 Bowman Damage	180 Oxygen 25 Wood 5 Minerals	24	Barracks	I
Leather Gauntlets	+40 Lobber Health	180 Oxygen 25 Wood 5 Minerals	24	Barracks	I
Intense Training	+3 Range and Line of Sight for all Barracks units	180 Oxygen 25 Wood 10 Minerals	24	Barracks	I
Advanced Bunkhouse	+5 Military Capacity	360 Oxygen 45 Wood 20 Minerals 120 Stone	42	Citadel	II
Weighted Net	+ 2 Horrors hit by Captor attacks	360 Oxygen 45 Wood 20 Minerals	42	Barracks	II
Improved Masonry	+20% Toughness Health Bonus	540 Oxygen 30 Minerals 150 Stone	33	Masonry Guild	II
Mistfuel Lanterns	Increases the sight radius of buildings	360 Oxygen 45 Wood 20 Minerals 120 Stone	33	Masonry Guild	II
Crosscut Saws	Increases Wood harvesting rate	225 Oxygen 18 Wood 5 Minerals	24	Warehouse Master Warehouse	II
Steel Pickaxes	Increases Stone harvesting rate	135 Oxygen 45 Wood 20 Minerals	24	Warehouse Master Warehouse	II
Large Sleeping Quarters	+10 Military Capacity	810 Oxygen 70 Wood 40 Minerals 240 Stone	42	Citadel	III
Reinforced Traps	15 Trap Health	810 Oxygen 70 Wood 60 Minerals 240 Stone	42	Masonry Guild	III
Expert Masonry	+20% Toughness Health Bonus	720 Oxygen 50 Minerals 315 Stone	42	Masonry Guild	III
Refined Powder	Increases the Cannoneer attack area-of-effect	360 Oxygen 45 Wood 20 Minerals	33	Bomber's Workshop	III
Mechanized Pickaxes	Increases Stone harvesting rate	315 Oxygen 90 Wood 35 Minerals 60 Stone	33	Warehouse Master Warehouse	III
Mineral Trollies	Increases Minerals harvesting rate	540 Oxygen 60 Wood 10 Minerals 180 Stone	33	Warehouse Master Warehouse	III
Two-Man Saws	Increases Wood harvesting rate	400 Oxygen 30 Wood 10 Minerals 180 Stone	33	Warehouse Master Warehouse	III
Double-Filter Masks	-10% Unit Maintenance	180 Oxygen 25 Wood 10 Minerals	24	Air Silo	III
Triple-Filter Masks	-10% Unit Maintenance	360 Oxygen 45 Wood 20 Minerals 120 Stone	33	Air Silo	III
Extended Lodgings	+10 Military Capacity	810 Oxygen 70 Wood 40 Minerals 240 Stone	42	Citadel	IV
Masterful Masonry	+20% Toughness Health Bonus	990 Oxygen 75 Minerals 675 Stone	45	Masonry Guild	IV
Ballistae Overhaul	Increases the Ballista attack area-of-effect	810 Oxygen 70 Wood 40 Minerals	42	Bomber's Workshop	IV
Mineral Conveyors	Increases Minerals harvesting rate	900 Oxygen 120 Wood 15 Minerals 300 Stone	42	Warehouse Master Warehouse	IV
Wax-Treated Hoods	+8 Hunter Damage +5 Hunter Range	810 Oxygen 70 Wood 30 Minerals	42	Elite's Quarters	IV