Structures and Upgrades Costs

The civilized world is comprised of settlements, the Guild Hall itself is independent from civilization but multiple kinds of settlements can be build near or even on the Hall.
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Guild Upgrades

Guild Grounds
Small Grounds, 200 Gold, 10 Staff Slots
Medium Grounds, 300 Gold, 15 Staff Slots
Large Grounds, 400 Gold, 25 Staff Slots
Very Large Grounds, 500 Gold, 50 Staff Slots

Barracks
Barracks 1, 150 Gold, +(1/1) to stationed staff's combat numbers
Barracks 2, 250 Gold +(1/1) to stationed staff's combat numbers
Barracks 3, 350 Gold, +(1/1) to stationed staff's combat numbers

Cellar
Catacombs, 250 Gold, Prevents hauntings of dead staff
Dungeon Complex, 350 Gold, A maze that confuses and injures intruders
Armory, 500 Gold, Staff on missions will gain +2 to their proficient skills

Garden
Garden, 150 Gold, Produces 2 copper for every staff that isn't occupied with a task
Scenic Pond, 250 Gold, This pond makes it easier to impress guests
Hedge Maze, 350 Gold, This decorative plant is a symbol of wealth and endears you to wealthier gusts

Stable
Small Stable, 150 Gold, Holds wagons and PC horses they roam the grounds otherwise
Riding Grounds, 250 Gold, Exercise the horses in a safe area
Race Track, 350 Gold, Hold races for betting and income

Vault
Fortified Vault, 150 Gold, A metal door immune to any thief's lockpicks
Secret Passages, 250 Gold, For escape or secret business
Hidden Chamber, 350 Gold, A room warded and hidden sure to be safe from spells and eyes

Laboratory, 500 Gold, A room dedicated to developing new methods of warfare

Magic Observatory, 750 Gold, A room dedicated to charting the movements of the heavens to portend and divine futures / and helps discover the locations of Magic Sites
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Guild upgrades stack on top of each other however the upgrades below replace the previous upgrade.
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https://skyarch.forumotion.com/t102-independent-upgrades
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All structures have a base cost of 600 gold plus an additional 100 gold for each settlement already built in the province.
All primary buildings take 3 in-game weeks to build, all upgrades take 1 week.
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Castle

Base Manpower: (1/1) 225
Starting Income: 4 Gold Per Week
Fortification Level: 3K

Castle Fortifications
Castle Fortifications 1, 50 Gold, +0.5k fort level
Castle Fortifications 2, 100 Gold, +1k fort level
Castle Fortifications 3, 150 Gold, +1.5k fort level
Castle Fortifications 4, 200 Gold, +2k fort level
Castle Fortifications 5, 300 Gold, +3k fort level

Walls
Castle Walls 1, 50 Gold, +0.5k fort level, +2.5% Base Manpower
Castle Walls 2, 50 Gold, +1k fort level, +2.5% Base Manpower
Castle Walls 3, 100 Gold, +1.5k fort level, +5% Base Manpower
Castle Walls 4, 150 Gold, +2k fort level, +5% Base Manpower
Castle Walls 5, 150 Gold, +2.5k fort level, +10% Base Manpower

Keeps
Keep 1, 150 Gold, +5% Base Manpower
Keep 2, 200 Gold, +10% Base Manpower
Keep 3, 300 Gold, +15% Base Manpower
Keep 4, 400 Gold, +20% Base Manpower
Keep 5, 500 Gold, +25% Base Manpower
Keep 6, 500 Gold, +30% Base Manpower

Militia training grounds
Militia training grounds 1, 100 Gold, +20 (1/1) Manpower
Militia training grounds 2, 120 Gold, +30 (1/1) Manpower
Militia training grounds 3, 200 Gold, +40 (1/1) Manpower
Militia training grounds 4, 300 Gold, +50 (1/1) Manpower

Training grounds
Training grounds 1, 200 Gold, +10% Base Manpower
Training grounds 2, 250 Gold, +15% Base Manpower
Training grounds 3, 300 Gold, +20% Base Manpower

Barracks
Barracks 1, 100 Gold, +30 (6/6) Manpower
Barracks 2, 120 Gold, +40 (6/6) Manpower
Barracks 3, 200 Gold, +45 (6/6) Manpower
Barracks 4, 300 Gold, +50 (6/6) Manpower
Barracks 5, 400 Gold, +60 (6/6) Manpower
Barracks 6, 500 Gold, +65 (6/6) Manpower

Castle town
Castle town 1, 100 Gold, +2 Gold Per Week
Castle town 2, 120 Gold, +4 Gold Per Week
Castle town 3, 200 Gold, +6 Gold Per Week
Castle town 4, 300 Gold, +8 Gold Per Week
Castle town 5, 400 Gold, +10 Gold Per Week
Castle town 6, 500 Gold, +12 Gold Per Week

Weaponsmith
Weaponsmith 1, 300 Gold, +5% Base Manpower, Weapons +1
Weaponsmith 2, 400 Gold, +10% Base Manpower, Weapons +2
Weaponsmith 3, 500 Gold, +15% Base Manpower, Weapons +3
Weaponsmith 4, 600 Gold, +20% Base Manpower, Weapons +4
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Hamlet->Village->Town->City

The upgrades must be bought in tiers, once the full list of "__1" is bought the Hamlet turns into a village and so on.
Once "__4" is bought they can be bought without tier restriction.

Base Manpower: (1/1) 100
Starting Income: 12 Gold Per Week

Fortification
Fortifications 1, 50 Gold, +0.5k fort level
Fortifications 2, 50 Gold, +1k fort level
Fortifications 3, 50 Gold, +1.5k fort level
Fortifications 4, 100 Gold, +2k fort level
Fortifications 5, 100 Gold, +2.5k fort level

Walls
Walls 1, 50 Gold, +0.5k fort level, +2.5% Base Manpower
Walls 2, 50 Gold, +0.5k fort level, +2.5% Base Manpower
Walls 3, 100 Gold, +1k fort level, +5% Base Manpower
Walls 4, 150 Gold, +1k fort level, +5% Base Manpower
Walls 5, 150 Gold, +1.5k fort level, +10% Base Manpower

Militia Training Grounds
Militia Training Grounds 1, 150 Gold, +5% Base Manpower
Militia Training Grounds 2, 200 Gold, +7.5% Base Manpower
Militia Training Grounds 3, 300 Gold, +10% Base Manpower
Militia Training Grounds 4, 400 Gold, +12.5% Base Manpower
Militia Training Grounds 5, 500 Gold, +15% Base Manpower
Militia Training Grounds 6, 500 Gold, +20% Base Manpower

Mustering Grounds
Mustering Grounds 1, 100 Gold, +100 (1/1) Manpower
Mustering Grounds 2, 120 Gold, +200 (1/1) Manpower
Mustering Grounds 3, 200 Gold, +300 (2/2) Manpower
Mustering Grounds 4, 300 Gold, +400 (2/2) Manpower
Mustering Grounds 5, 400 Gold, +500 (2/2) Manpower
Mustering Grounds 6, 500 Gold, +600 (3/3) Manpower

Town Market
Town Market 1, 100 Gold, +3 gold per week
Town Market 2, 120 Gold, +6 gold per week
Town Market 3, 200 Gold, +9 gold per week
Town Market 4, 300 Gold, +12 gold per week
Town Market 5, 400 Gold, +15 gold per week
Town Market 6, 500 Gold, +18 gold per week
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Temple

Base Manpower: (1/1) 130
Starting Income: 8 Gold Per Week

Church Walls
Church Walls 1, 50 Gold,+0.5k fort level, +2.5% Base Manpower, +0.2 Gold Per Week
Church Walls 2, 50 Gold,+1k fort level, +2.5% Base Manpower, +0.2 Gold Per Week
Church Walls 3, 100 Gold,+1.5k fort level, +2.5% Base Manpower, +0.2 Gold Per Week
Church Walls 4, 100 Gold,+2k fort level, +5% Base Manpower, +0.2 Gold Per Week
Church Walls 5, 100 Gold,+2.5k fort level, +7% Base Manpower, +0.5 Gold Per Week

Church
Church 1, 150 Gold, +5% Base Manpower
Church 2, 200 Gold, +10% Base Manpower
Church 3, 300 Gold, +15% Base Manpower
Church 4, 400 Gold, +20% Base Manpower
Church 5, 500 Gold, +25% Base Manpower
Church 6, 700 Gold, +30% Base Manpower

Militia Quarters
Militia Quarters 1, 100 Gold, +100 (1/1) Manpower
Militia Quarters 2, 120 Gold, +200 (1/1) Manpower
Militia Quarters 3, 200 Gold, +300 (1/1) Manpower
Militia Quarters 4, 300 Gold, +400 (1/1) Manpower
Militia Quarters 5, 400 Gold, +500 (1/1) Manpower
Militia Quarters 6, 500 Gold, +600 (1/1) Manpower

Barracks
Barracks 1, 100 Gold, +100 (6/6) Manpower
Barracks 2, 120 Gold, +200 (6/6) Manpower
Barracks 3, 200 Gold, +300 (6/6) Manpower
Barracks 4, 300 Gold, +400 (6/6) Manpower
Barracks 5, 400 Gold, +500 (6/6) Manpower
Barracks 6, 500 Gold, +600 (6/6) Manpower

Church town
Church town 1, 100 Gold, +2 Gold Per Week
Church town 2, 120 Gold, +4 Gold Per Week
Church town 3, 200 Gold, +6 Gold Per Week
Church town 4, 300 Gold, +8 Gold Per Week
Church town 5, 400 Gold, +10 Gold Per Week
Church town 6, 500 Gold, +12 Gold Per Week