Building Levels & Bonuses

Every building keeps paying out at every level — nothing plateaus after the first few upgrades. This page lists the exact per-level rule for each structure and the value it reaches at sample levels.

How to read this

Production, storage and protection buildings scale multiplicatively: each level is a percentage of the last, so late levels are worth far more in absolute terms.
Costs rise 42–60% per level and build times 30% per level, so upgrades stay meaningful choices rather than checklist items.
Your Headquarters level caps every other building, and every HQ level also speeds up all construction.

Headquarters — max level 75

Raises the level ceiling of every other building, unlocks new structures, cuts all build times by 2% per level (compounding) and raises your loan limit.

Level	What you get
1	2.0% faster builds · loan cap 2,500g
5	9.6% faster builds · loan cap 62,500g
10	18.3% faster builds · loan cap 250,000g
20	33.2% faster builds · loan cap 1,000,000g
30	45.5% faster builds · loan cap 2,250,000g
45	59.7% faster builds · loan cap 5,062,500g
60	70.2% faster builds · loan cap 9,000,000g
75	78.0% faster builds · loan cap 14,062,500g

Woodcutter — max level 75

+22% wood per hour per level (compounding).

Level	What you get
1	30 wood/hr
5	66 wood/hr
10	179 wood/hr
20	1,312 wood/hr
30	9,584 wood/hr
45	189,214 wood/hr
60	3,735,521 wood/hr
75	73,747,741 wood/hr

Quarry — max level 75

+22% stone per hour per level (compounding).

Level	What you get
1	30 stone/hr
5	66 stone/hr
10	179 stone/hr
20	1,312 stone/hr
30	9,584 stone/hr
45	189,214 stone/hr
60	3,735,521 stone/hr
75	73,747,741 stone/hr

Iron Mine — max level 75

+22% iron per hour per level (compounding).

Requires Headquarters level 2.

Level	What you get
1	15 iron/hr
5	33 iron/hr
10	89 iron/hr
20	656 iron/hr
30	4,792 iron/hr
45	94,607 iron/hr
60	1,867,760 iron/hr
75	36,873,870 iron/hr

Farm — max level 75

+22% food per hour per level (compounding) — food also pays troop upkeep.

Level	What you get
1	35 food/hr
5	77 food/hr
10	209 food/hr
20	1,530 food/hr
30	11,181 food/hr
45	220,749 food/hr
60	4,358,108 food/hr
75	86,039,031 food/hr

Warehouse — max level 75

+30% storage cap per level for wood, stone, iron and food.

Level	What you get
1	5,000 cap / resource
5	14,280 cap / resource
10	53,022 cap / resource
20	730,960 cap / resource
30	74,965,040 cap / resource
45	78,671,176,943 cap / resource
60	82,560,537,592,352 cap / resource
75	86,642,181,194,183,040 cap / resource

Vault — max level 75

+30% per level to the amount of every resource that raiders can never take.

Requires Headquarters level 3.

Level	What you get
1	260 protected / resource
5	742 protected / resource
10	2,757 protected / resource
20	38,009 protected / resource
30	523,999 protected / resource
45	26,821,363 protected / resource
60	1,372,875,434 protected / resource
75	70,271,855,114 protected / resource

Hidden Vault — max level 60

+45% per level to the Gold that can never be looted (1% fee in and out).

Requires Vault level 5.

Level	What you get
1	10,000g unraidable
5	44,205g unraidable
10	283,342g unraidable
20	11,641,046g unraidable
30	478,268,815g unraidable
45	125,948,238,634g unraidable
60	33,167,453,723,250g unraidable

Barracks — max level 75

Unlocks troop tiers and makes every unit train 3% faster per level (compounding).

Requires Headquarters level 2.

Level	What you get
1	Swordsman ×1 in 10 min
5	Swordsman ×1 in 9 min
10	Swordsman ×1 in 8 min
20	Swordsman ×1 in 6 min
30	Swordsman ×1 in 4 min
45	Swordsman ×1 in 3 min
60	Swordsman ×1 in 2 min
75	Swordsman ×1 in 1 min

Training Grounds — max level 60

+1 battle-stat point per session every 12 levels, and each level cuts drill gold cost by 0.5% (max −30%).

Requires Barracks level 2.

Level	What you get
1	1 pts/session · −0.5% cost
5	1 pts/session · −2.5% cost
10	1 pts/session · −5.0% cost
20	2 pts/session · −10.0% cost
30	3 pts/session · −15.0% cost
45	4 pts/session · −22.5% cost
60	6 pts/session · −30.0% cost

Wall — max level 75

+5% defence power for your whole garrison per level.

Requires Headquarters level 2.

Level	What you get
1	+5% defence
5	+25% defence
10	+50% defence
20	+100% defence
30	+150% defence
45	+225% defence
60	+300% defence
75	+375% defence

Watchtower — max level 75

Narrows the estimated size of incoming hosts by 7% per level, from a ±60% guess toward the true count.

Requires Headquarters level 3.

Level	What you get
1	±60.0% accuracy band
5	±44.9% accuracy band
10	±31.2% accuracy band
20	±15.1% accuracy band
30	±7.3% accuracy band
45	±2.5% accuracy band
60	±0.8% accuracy band
75	±0.5% accuracy band

Research Lab — max level 45

Unlocks the ten tech lines and cuts research time by 3% per level (compounding).

Requires Headquarters level 5.

Level	What you get
1	0.0% faster research
5	11.5% faster research
10	24.0% faster research
20	43.9% faster research
30	58.7% faster research
45	73.8% faster research

Scholar's Academy — max level 45

Gates Scholar's Academy course levels and shortens every course.

Requires Research Lab level 2.

Level	What you get
1	Course tiers up to Academy 1
5	Course tiers up to Academy 5
10	Course tiers up to Academy 10
20	Course tiers up to Academy 20
30	Course tiers up to Academy 30
45	Course tiers up to Academy 45

Market — max level 45

−0.1% trading fee per level on Market, Bazaar and Auction sales (5% base, 1% floor).

Requires Headquarters level 4.

Level	What you get
1	4.9% sale fee
5	4.5% sale fee
10	4.0% sale fee
20	3.0% sale fee
30	2.0% sale fee
45	1.0% sale fee

Embassy — max level 30

Lv 1 join a house, Lv 5 found one. Every level adds alliance production, member capacity, treasury boost discount and weekly tax relief.

Requires Headquarters level 5.

Level	What you get
1	+5.0% prod · 25 members · −1.0% boosts · −0.0% tax
5	+6.0% prod · 29 members · −5.0% boosts · −6.9% tax
10	+7.2% prod · 34 members · −10.0% boosts · −15.5% tax
20	+9.6% prod · 44 members · −20.0% boosts · −32.7% tax
30	+12.0% prod · 54 members · −30.0% boosts · −49.9% tax

Mint — max level 60

+1 Gold per day per level, paid out continuously.

Requires Headquarters level 4.

Level	What you get
1	1 Gold/day
5	5 Gold/day
10	10 Gold/day
20	20 Gold/day
30	30 Gold/day
45	45 Gold/day
60	60 Gold/day

Treasury — max level 20

+5% raid protection on top of the Vault per level (max +100%).

Requires Vault level 3.

Level	What you get
1	×1.05 vault protection
5	×1.25 vault protection
10	×1.50 vault protection
20	×2.00 vault protection

Stables — max level 40

−0.5% march time per level on every mission (max −20%).

Requires Barracks level 3.

Level	What you get
1	−0.5% march time
5	−2.5% march time
10	−5.0% march time
20	−10.0% march time
30	−15.0% march time

Guildhall — max level 45

+1 concurrent build slot every 15 levels (max +3), plus +0.4% build speed every single level (max +18%).

Requires Headquarters level 6.

Level	What you get
1	+0 slot(s) · +0.4% build speed
5	+0 slot(s) · +2.0% build speed
10	+0 slot(s) · +4.0% build speed
20	+1 slot(s) · +8.0% build speed
30	+2 slot(s) · +12.0% build speed
45	+3 slot(s) · +18.0% build speed

Chapel — max level 20

+2% Champion XP gain per level (max +40%).

Requires Headquarters level 4.

Level	What you get
1	×1.02 Champion XP
5	×1.10 Champion XP
10	×1.20 Champion XP
20	×1.40 Champion XP

Infirmary — max level 20

+8% Champion HP regeneration per level (max +160%).

Requires Chapel level 2.

Level	What you get
1	×1.08 regen rate
5	×1.40 regen rate
10	×1.80 regen rate
20	×2.60 regen rate

Grand Sawmill — max level 100

Ruinously expensive gold sink. +1% Woodcutter output per level, capped at +50%.

Requires Woodcutter level 10.

Level	What you get
1	×1.01 wood production
5	×1.05 wood production
10	×1.10 wood production
20	×1.20 wood production
30	×1.30 wood production
45	×1.45 wood production
60	×1.50 wood production
75	×1.50 wood production
90	×1.50 wood production
100	×1.50 wood production

Masons' Lodge — max level 100

Ruinously expensive gold sink. +1% Quarry output per level, capped at +50%.

Requires Quarry level 10.

Level	What you get
1	×1.01 stone production
5	×1.05 stone production
10	×1.10 stone production
20	×1.20 stone production
30	×1.30 stone production
45	×1.45 stone production
60	×1.50 stone production
75	×1.50 stone production
90	×1.50 stone production
100	×1.50 stone production

Great Smelter — max level 100

Ruinously expensive gold sink. +1% Iron Mine output per level, capped at +50%.

Requires Iron Mine level 10.

Level	What you get
1	×1.01 iron production
5	×1.05 iron production
10	×1.10 iron production
20	×1.20 iron production
30	×1.30 iron production
45	×1.45 iron production
60	×1.50 iron production
75	×1.50 iron production
90	×1.50 iron production
100	×1.50 iron production

Irrigation Works — max level 100

Ruinously expensive gold sink. +1% Farm output per level, capped at +50%.

Requires Farm level 10.

Level	What you get
1	×1.01 food production
5	×1.05 food production
10	×1.10 food production
20	×1.20 food production
30	×1.30 food production
45	×1.45 food production
60	×1.50 food production
75	×1.50 food production
90	×1.50 food production
100	×1.50 food production

Upgrade priorities

Early (HQ 1–10): Headquarters, then the four producers and the Warehouse — everything else is paid for by production.
Mid (HQ 10–30): Guildhall for parallel builds and build speed, Barracks and Wall for safety, Market to cut trading fees, Vault and Treasury to keep your stockpile.
Late (HQ 30+): Research Lab and Academy for permanent account-wide bonuses, Hidden Vault for untouchable Gold, Stables and Training Grounds to sharpen every march.

Ready to build your empire?

Play Ironhold Empire