diff --git a/core/src/com/unciv/logic/city/CityConstructions.kt b/core/src/com/unciv/logic/city/CityConstructions.kt
index f7654c7e43..624c83a38d 100644
--- a/core/src/com/unciv/logic/city/CityConstructions.kt
+++ b/core/src/com/unciv/logic/city/CityConstructions.kt
@@ -205,7 +205,7 @@ class CityConstructions {
         val turnsToConstruction = turnsToConstruction(constructionName, useStoredProduction)
         val currentProgress = if (useStoredProduction) getWorkDone(constructionName) else 0
         val lines = ArrayList<String>()
-        val buildable = construction.uniques.none{ it == "Unbuildable" }
+        val buildable = construction.uniqueObjects.none{ it.isOfType(UniqueType.Unbuildable) }
         if (buildable)
             lines += (if (currentProgress == 0) "" else "$currentProgress/") +
                     "$cost${Fonts.production} $turnsToConstruction${Fonts.turn}"
diff --git a/core/src/com/unciv/logic/city/IConstruction.kt b/core/src/com/unciv/logic/city/IConstruction.kt
index b0bfdc3b06..274ec33f8d 100644
--- a/core/src/com/unciv/logic/city/IConstruction.kt
+++ b/core/src/com/unciv/logic/city/IConstruction.kt
@@ -2,6 +2,7 @@ package com.unciv.logic.city
 
 import com.unciv.logic.civilization.CivilizationInfo
 import com.unciv.models.ruleset.IHasUniques
+import com.unciv.models.ruleset.unique.UniqueType
 import com.unciv.models.stats.INamed
 import com.unciv.models.stats.Stat
 import com.unciv.ui.utils.Fonts
@@ -27,7 +28,7 @@ interface INonPerpetualConstruction : IConstruction, INamed, IHasUniques {
     fun canBePurchasedWithStat(cityInfo: CityInfo?, stat: Stat): Boolean {
         if (stat in listOf(Stat.Production, Stat.Happiness)) return false
         if ("Cannot be purchased" in uniques) return false
-        if (stat == Stat.Gold) return !uniques.contains("Unbuildable")
+        if (stat == Stat.Gold) return !hasUnique(UniqueType.Unbuildable)
         // Can be purchased with [Stat] [cityFilter]
         if (getMatchingUniques("Can be purchased with [] []")
                 .any { it.params[0] == stat.name && (cityInfo != null && cityInfo.matchesFilter(it.params[1])) }
diff --git a/core/src/com/unciv/models/ruleset/Building.kt b/core/src/com/unciv/models/ruleset/Building.kt
index 8b772225b5..296c54a629 100644
--- a/core/src/com/unciv/models/ruleset/Building.kt
+++ b/core/src/com/unciv/models/ruleset/Building.kt
@@ -107,7 +107,7 @@ class Building : RulesetStatsObject(), INonPerpetualConstruction {
     private fun getUniquesStringsWithoutDisablers() = getUniquesStrings()
         .filterNot {
             it.startsWith("Hidden ") && it.endsWith(" disabled") ||
-            it == "Unbuildable" ||
+            it == UniqueType.Unbuildable.text ||
             it == Constants.hideFromCivilopediaUnique
         }
 
@@ -403,7 +403,7 @@ class Building : RulesetStatsObject(), INonPerpetualConstruction {
             rejectionReasons.add(RejectionReason.AlreadyBuilt)
         // for buildings that are created as side effects of other things, and not directly built,
         // or for buildings that can only be bought
-        if (uniques.contains("Unbuildable"))
+        if (hasUnique(UniqueType.Unbuildable))
             rejectionReasons.add(RejectionReason.Unbuildable)
 
         for (unique in uniqueObjects) {
@@ -467,7 +467,7 @@ class Building : RulesetStatsObject(), INonPerpetualConstruction {
                     if (civInfo.tech.isResearched(unique.params[0])) 
                         rejectionReasons.add(RejectionReason.Obsoleted.apply { errorMessage = unique.text })
 
-                "Hidden when religion is disabled" -> 
+                UniqueType.HiddenWithoutReligion.text ->
                     if (!civInfo.gameInfo.isReligionEnabled())
                         rejectionReasons.add(RejectionReason.DisabledBySetting)
             }
diff --git a/core/src/com/unciv/models/ruleset/Ruleset.kt b/core/src/com/unciv/models/ruleset/Ruleset.kt
index 5b05d38010..661a291709 100644
--- a/core/src/com/unciv/models/ruleset/Ruleset.kt
+++ b/core/src/com/unciv/models/ruleset/Ruleset.kt
@@ -256,7 +256,7 @@ class Ruleset {
      *  */
     fun updateBuildingCosts() {
         for (building in buildings.values) {
-            if (building.cost == 0 && !building.uniques.contains("Unbuildable")) {
+            if (building.cost == 0 && !building.hasUnique(UniqueType.Unbuildable)) {
                 val column = technologies[building.requiredTech]?.column
                         ?: throw UncivShowableException("Building (${building.name}) is buildable and therefore must either have an explicit cost or reference an existing tech")
                 building.cost = if (building.isAnyWonder()) column.wonderCost else column.buildingCost
@@ -393,7 +393,7 @@ class Ruleset {
         }
 
         for (building in buildings.values) {
-            if (building.requiredTech == null && building.cost == 0 && !building.uniques.contains("Unbuildable"))
+            if (building.requiredTech == null && building.cost == 0 && !building.hasUnique(UniqueType.Unbuildable))
                 lines += "${building.name} is buildable and therefore must either have an explicit cost or reference an existing tech!"
 
             checkUniques(building, lines, UniqueType.UniqueComplianceErrorSeverity.RulesetInvariant)
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
index 328c904255..592b0bcd6c 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
@@ -138,6 +138,12 @@ enum class UniqueType(val text:String, vararg targets: UniqueTarget) {
     MayanGainGreatPerson("Receive a free Great Person at the end of every [comment] (every 394 years), after researching [tech]. Each bonus person can only be chosen once.", UniqueTarget.Nation),
     MayanCalendarDisplay("Once The Long Count activates, the year on the world screen displays as the traditional Mayan Long Count.", UniqueTarget.Nation),
 
+    ///////////////////////////////////////// BUILDING UNIQUES /////////////////////////////////////////
+
+    Unbuildable("Unbuildable", UniqueTarget.Building),
+
+
+
     ///////////////////////////////////////// UNIT UNIQUES /////////////////////////////////////////
 
     FoundCity("Founds a new city", UniqueTarget.Unit),
diff --git a/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt b/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
index 32fa8b0b2d..e75439eb12 100644
--- a/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
+++ b/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
@@ -90,7 +90,7 @@ class BaseUnit : RulesetObject(), INonPerpetualConstruction {
 
         if (replacementTextForUniques != "") lines += replacementTextForUniques
         else for (unique in uniques.filterNot {
-            it.startsWith("Hidden ") && it.endsWith(" disabled") || it == "Unbuildable"
+            it.startsWith("Hidden ") && it.endsWith(" disabled") || it == UniqueType.Unbuildable.text
         })
             lines += unique.tr()
 
@@ -382,7 +382,7 @@ class BaseUnit : RulesetObject(), INonPerpetualConstruction {
         val rejectionReasons = RejectionReasons()
         val ruleSet = civInfo.gameInfo.ruleSet
 
-        if (uniques.contains("Unbuildable")) 
+        if (hasUnique(UniqueType.Unbuildable))
             rejectionReasons.add(RejectionReason.Unbuildable)
 
         if (requiredTech != null && !civInfo.tech.isResearched(requiredTech!!))