Part of the Sea of Conquest Cabins Series — this is the hub:

Flagship Guide: The hull that gates every cabin.

Recipes Hub: What the galley and distillery produce.

Progression Guide: Where cabins sit in the build order.

Resources Hub: What the production rooms feed.

Quick Answer

Cabins are the rooms inside your flagship, and there are more of them than new players realise — roughly twenty, split across production, progression, combat and crafting. Every one is capped at your flagship level.

Which means the correct upgrade policy is short: build only what a flagship upgrade requirement names, then go straight back to the flagship. Cabins built beyond the requirement cap out and idle, and that is the single most common reason players stall in the mid-game.

The rooms that appear in flagship requirements most often are the Astrologer's Chamber, Drill Hall, Liaison Office, Sick Bay, Enlistment Quarters, Captain's Quarters, Galley and Distillery — those are the ones worth watching.

The Cabin Rule

One dependency chain runs the whole game:

Flagship level → cabin level cap → production and capability → materials for the next flagship level.

So the loop is:

Try to upgrade the flagship.
If blocked, read the requirement — it names the exact cabins and levels.
Build only those.
Return to step 1.

The flagship guide has the level-by-level requirement table, so you can see which cabins are about to be asked for and build ahead of the block rather than behind it.

Every Cabin and What It Does

Progression cabins — these gate your flagship

Cabin	What it does	Notes
Shipbuilder's Study	Holds your build queues	Two queues placeable; a third is a paid unlock. Each upgrade cuts build time by 1%
Astrologer's Chamber	Stargazing and star signs	Appears in flagship requirements repeatedly (levels 21, 25, 37). Itself gated by the Construction Materials Room
Drill Hall	Raises sailor level, which is direct combat power	Flagship prerequisite at many levels. Gated by the Smithing Table
Liaison Office	Gang and alliance liaison functions	Flagship prerequisite at 18, 22, 26, 30
Sick Bay	Sailor recovery	Flagship prerequisite at 21 and 25
Enlistment Quarters	More sailors for ports, faster resupply	Flagship prerequisite at 8 and 28
Captain's Quarters	Sailor attack bonus — a large multiplier on ship Attack	Gated by the Mess Hall up to level 35. See attack vs damage for why this matters more than it looks
Crew Quarters	Sailor reserve capacity	Keeps you from running dry between fights

Production cabins — these feed everything

Cabin	Produces
Lumber Room	Wood
Smithing Table	Iron — and gates the Drill Hall
Construction Materials Room	A percentage discount on build timers, and gates the Astrologer's Chamber
Storage	Resource capacity, including your protected cap

The Construction Materials Room is the quiet one. It does not produce a resource, it produces time — and because it also gates the Astrologer's Chamber, neglecting it blocks flagship levels 21 and 25 later.

Crafting cabins

Cabin	What it does	Unlocks at
Galley	Cooking — see the cooking recipes guide	Flagship level 4
Distillery	Drinks — see the distillery recipes guide	Flagship level 6
Mess Hall	Where you sell dishes and drinks for gold. Also gates the Captain's Quarters up to 35	—

That third row is the one people miss. The Mess Hall is not where you cook — it is the sales counter, and it is why crafted food converts to gold at all. It is also a hard prerequisite for the Captain's Quarters, which is a major combat-power room, so neglecting your crafting economy quietly caps your combat stats.

Both the Galley and Distillery appear directly in flagship requirements (level 11, 15 and 31 all want them), so crafting is on the critical path whether you enjoy it or not.

Ingredient rooms — the four that feed the galley

Room	Produces
Water Cabin	Fresh Water — and gates the Distillery
Chicken Coop	Eggs — and gates the Distillery
Cattle Shed	Milk — and gates the Galley
Salvage Bay	Aquatic products (fish) — and gates the Galley

These four are the entire supply side of your cooking economy. Water, Eggs and Milk appear in dozens of recipes, and the Salvage Bay is one of the two ways to get fish at all — the other being fishing.

Practical consequence: if you are constantly short of Water or Eggs, you do not have a gathering problem, you have an under-levelled Water Cabin or Chicken Coop.

Combat cabin

Cabin	What it does
Gun Bay	Sailor attack — direct combat power. Gated by flagship level at 6, 12, 18 and beyond

The Gun Bay does not gate progression, which is why players defer it indefinitely and then discover during their first alliance war that they cannot fight. Build it when PvP starts mattering — but do build it.

Upgrade Priority

When you have a genuine choice — and often you do not, because the flagship requirement decides for you:

Whatever the flagship upgrade demands. Always first, no exceptions.
Construction Materials Room. It discounts every future build timer and unblocks the Astrologer's Chamber later. The highest-compounding room in the ship.
Shipbuilder's Study. Build-time reduction compounds the same way.
Storage, if you are consistently above your protected cap or getting raided.
The four ingredient rooms, to keep crafting fed.
Captain's Quarters, once you care about combat power — the sailor bonus is a large multiplier.
Gun Bay, when you start fighting.

Common Cabin Mistakes

Building everything evenly. Feels productive, is the slowest route through the game.

Ignoring the Construction Materials Room. It looks like a boring production room. It is actually a timer discount and a gate on the Astrologer's Chamber, which is a flagship prerequisite at 21, 25 and 37.

Neglecting the Mess Hall. It gates the Captain's Quarters to level 35, so skipping your crafting economy caps a major combat room.

Maxing the Galley and Distillery early. Keep them at whatever the flagship requirement asks (10, 14, 30) and no higher until you are comfortable.

Not using alliance help. It cuts cabin timers for free and costs your alliance-mates nothing — see the alliance guide.

FAQ

Which cabin should I upgrade first in Sea of Conquest?

Whichever one your flagship upgrade requirement names. Beyond that, the Construction Materials Room and Shipbuilder's Study give the most compounding value, because both reduce build times on everything afterwards.

Why can't I upgrade a cabin?

Either it is capped at your flagship level, or it has its own prerequisite room — the Astrologer's Chamber needs the Construction Materials Room, the Drill Hall needs the Smithing Table, the Galley needs the Salvage Bay and Cattle Shed, the Distillery needs the Water Cabin and Chicken Coop, and the Captain's Quarters needs the Mess Hall up to level 35.

What is the difference between the galley and the mess hall?

The Galley cooks. The Mess Hall is where you sell the results for gold. They are separate rooms with separate purposes, and the Mess Hall also gates the Captain's Quarters.

Where do eggs, milk and water come from?

The Chicken Coop, Cattle Shed and Water Cabin respectively. Fish come from the Salvage Bay or from fishing. These four rooms are your entire cooking supply chain.

Do I need to upgrade every cabin?

Eventually, but never evenly. Build what the flagship demands, keep the ingredient rooms fed, and let the rest wait.

How do I speed up cabin upgrades?

Alliance help first — it is free. Then the Construction Materials Room's timer discount and the Shipbuilder's Study's 1%-per-level reduction. Speedups only on cabins directly blocking a flagship upgrade.

Key Takeaways

Every cabin is capped at flagship level. Build to the requirement, no further.
The Construction Materials Room is the sleeper pick — timer discount plus a gate on the Astrologer's Chamber.
The Mess Hall sells food and gates the Captain's Quarters. Crafting is on the combat critical path.
Four ingredient rooms — Water Cabin, Chicken Coop, Cattle Shed, Salvage Bay — supply your whole galley.
Don't defer the Gun Bay forever. Alliance content needs it.

Sea of Conquest Cabins: Every Flagship Room and Upgrade Priority