Part of the Building Priority Series:

Beginner Strategy Hub: Related reading.

Furnace Upgrade Guide: How to Upgrade Fast: Related reading.

Every building in your city competes for the same construction queues, the same resources, and the same speedups. Choosing what to upgrade — and when — is one of the most consequential decisions in the early game. This guide breaks down which buildings deserve priority and, critically, why.

The Rule That Governs Everything: The Furnace

Before discussing any individual building, understand the system that controls all of them. The Furnace is your city's headquarters — the first structure built and the one that sets the ceiling for every other building. No other structure can exceed the Furnace's current level, and many buildings are locked entirely until specific Furnace thresholds are reached.

This means Furnace upgrades are never optional. They are the precondition for all other progression. Every building priority in this guide operates within that constraint.

Priority Tier 1: Buildings That Unlock at Furnace 7–9

Barricade (Available to Upgrade at Furnace 7)

The Barricade is your city wall. When attacked, it burns for a base duration of 30 minutes and loses durability — each additional attack adds another 30 minutes to that burn timer. If durability reaches zero, your city is forcibly teleported to a random location on the map, stripping you of any positional advantages you've established. You can restore up to 240 durability every 30 minutes, either by waiting or paying Diamonds to extinguish the fire immediately.

Upgrading the Barricade doesn't eliminate this vulnerability, but increasing its durability pool makes a forced teleport significantly harder for an attacker to achieve. In an active server environment, this is one of the few defensive investments that has a direct, measurable impact on your city's safety.

Embassy (Unlocks at Furnace 8)

The Embassy is your Alliance's foothold inside your city. At its core, it serves two functions: it determines how many reinforcing troops Alliance members can station inside your city, and it controls how many times Alliance members can help speed up your Construction, Research, and Healing.

Upgrading the Embassy directly increases both of these capacities. Because construction help from Alliance members translates into real time saved on every major upgrade you queue, this building pays compounding dividends throughout the game. Community consensus across multiple guides consistently identifies Embassy upgrades as one of the highest-return investments in the early game — not as a defensive measure, but as a construction accelerant.

Storehouse (Unlocks at Furnace 9)

The Storehouse protects a portion of your resources from enemy raids. Resources stored within its protection threshold cannot be plundered. One important nuance: protection capacity is not uniform across all resource types. Meat and Wood are protected up to the full capacity value; Coal is protected at one-fifth of that value; Iron at one-twentieth. This means the Storehouse provides substantially more protection for basic resources than for late-game materials.

A separate but useful function: the Storehouse generates construction speedups on an online timer that can be collected while you're active. This makes it a minor but consistent source of time savings over the course of the game.

Note that resources produced by your city's own production buildings — Sawmill, Hunter's Hut, Coal Mine, Iron Mine — are classified as "secured resources" and cannot be plundered regardless of Storehouse level.

Priority Tier 2: Buildings That Define Your Combat Ceiling

Military Camps (Infantry Camp, Marksman Camp, Lancer Camp)

Each of the three troop types has its own dedicated training facility. Upgrading these buildings increases how many troops can be trained simultaneously and reduces training time. More significantly, Military Camp levels are directly tied to troop tier unlocks. Tier-9 troops (Supreme Infantry, Supreme Lancer, Supreme Marksman) become available at Military Camp level 26, which requires Furnace level 26. Tier-10 (Apex) troops unlock at Military Camp level 30.

Once Tier-5 troops are unlocked, the game also grants the ability to promote lower-tier troops directly to the highest trainable tier — a mechanic that compounds the value of Military Camp upgrades over time.

Community consensus recommends keeping the Command Center level synchronized with Military Camp progression, as the two buildings work in tandem for combat effectiveness.

Command Center (Unlocks at Furnace 10)

The Command Center controls two combat-critical numbers: total troops that can be included in a Rally, and total troop deployment capacity (march size). Neither of these numbers can exceed what the Command Center's current level permits. Players who upgrade Military Camps aggressively while neglecting the Command Center will find themselves unable to deploy the troops they've trained at full effectiveness.

Priority Tier 3: Buildings That Protect Your Investment

Infirmary

Injured troops don't die — they report to the Infirmary to heal. This distinction is one of the more consequential mechanics in the game: losing troops to the Infirmary is recoverable; losing them permanently is not. However, if the Infirmary fills to capacity, overflow casualties begin to die in battle rather than heal. Upgrading the Infirmary increases its capacity, raising the threshold at which losses become permanent.

The relationship between your troop count, how aggressively you engage in combat, and your Infirmary capacity is worth monitoring as each scales upward.

Enlistment Office

The Enlistment Office activates only after the Infirmary is completely full — it serves as a secondary safety net, not a replacement for Infirmary capacity. When triggered, it saves 70% of the troops that would otherwise be permanently lost due to a full Infirmary. The exact Furnace level at which the Enlistment Office unlocks has not been confirmed in available sources, but its unlock appears to occur in the mid-game progression window.

Research Center: A Special Case (Unlocks at Furnace 9)

The Research Center deserves its own category because it doesn't fit neatly into a priority tier — it functions as a multiplier for everything else. It is organized into three research trees: Growth, Economy, and Battle. Upgrading the Research Center increases base research speed (from 0.1% at level 1 to 3.0% at level 30) and unlocks access to higher technology tiers.

Community consensus recommends completing all available research at each tier before upgrading the Research Center to the next level, on the grounds that the unlock cost is substantial and leaving available research behind wastes the value of the level.

Production Buildings: The Floor, Not the Ceiling

The Sawmill, Hunter's Hut, Coal Mine, and Iron Mine produce the resources that fund every other upgrade. Each can have up to six survivors assigned to its workstations, and workstation levels track the building level directly. These buildings do not generate strategic advantages in the way that Embassy or Military Camps do, but without sufficient resource throughput, every other priority stalls.

Community guides commonly suggest keeping production buildings at a stable upgrade level during Furnace-push phases, rather than maxing them immediately. This reflects a practical constraint: over-investing construction queues in production buildings can slow Furnace progression and delay the unlock thresholds that gate more impactful buildings.

The Underlying Logic

Reading across the full priority order, a pattern emerges. Buildings that unlock other buildings (Furnace) come first. Buildings that accelerate your other upgrades (Embassy) come early because their returns compound. Buildings that protect your city and troops (Barricade, Infirmary, Storehouse, Enlistment Office) scale in importance with how actively you engage in combat. Buildings that define your combat ceiling (Military Camps, Command Center) should advance in tandem, not in isolation.

No single building upgrade is a substitute for the others — but not all buildings are equally urgent at the same moment in your development.

A note on numbers: Construction times, exact resource costs, and per-level capacity values cited in community guides reflect base values before research, hero skills, alliance help, and state buffs are applied. Actual in-game values will differ. The in-game building preview is the authoritative source for your specific situation.

Related Handbook Guides:

Best Buildings to Upgrade First in Whiteout Survival