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