Index: binaries/data/config/default.cfg
===================================================================
--- binaries/data/config/default.cfg
+++ binaries/data/config/default.cfg
@@ -250,6 +250,7 @@
 idleonly = "I"                          ; Select only idle units
 woundedonly = "O"                       ; Select only wounded units
 remove = Ctrl                           ; Remove units from selection
+idlebuilder = Semicolon                 ; Select next idle builder
 idleworker = Period, NumDecimal         ; Select next idle worker
 idlewarrior = Slash, NumDivide          ; Select next idle warrior
 idleunit = BackSlash                    ; Select next idle unit
Index: binaries/data/mods/public/gui/manual/intro.txt
===================================================================
--- binaries/data/mods/public/gui/manual/intro.txt
+++ binaries/data/mods/public/gui/manual/intro.txt
@@ -71,6 +71,7 @@
   hotkey.selection.remove – Modifier - remove from selection (works with clicking and hotkeys, e.g. the idle hotkeys)
   hotkey.selection.offscreen - Modifier - add all units, including offscreen units, to selection.
   hotkey.selection.cancel – Unselect all units, cancel building placement.
+  hotkey.selection.idlebuilder – Select idle builder
   hotkey.selection.idlewarrior – Select idle fighter
   hotkey.selection.idleworker – Select idle worker (including citizen-soldiers)
   hotkey.selection.idleunit – Select idle unit
Index: binaries/data/mods/public/gui/session/hotkeys/misc.xml
===================================================================
--- binaries/data/mods/public/gui/session/hotkeys/misc.xml
+++ binaries/data/mods/public/gui/session/hotkeys/misc.xml
@@ -53,6 +53,10 @@
 	</object>
 
 	<!-- Find idle warrior - TODO: Potentially move this to own UI button? -->
+	<object hotkey="selection.idlebuilder">
+		<action on="KeyDown">findIdleUnit(["Builder"]);</action>
+	</object>
+
 	<object hotkey="selection.idlewarrior">
 		<action on="KeyDown">findIdleUnit(g_MilitaryTypes);</action>
 	</object>
Index: binaries/data/mods/public/gui/session/input.js
===================================================================
--- binaries/data/mods/public/gui/session/input.js
+++ binaries/data/mods/public/gui/session/input.js
@@ -423,7 +423,6 @@
 	},
 	"isIdle": entity => {
 		var entState = GetEntityState(entity);
-
 		return entState &&
 			hasClass(entState, "Unit") &&
 			entState.unitAI &&
Index: binaries/data/mods/public/simulation/components/Identity.js
===================================================================
--- binaries/data/mods/public/simulation/components/Identity.js
+++ binaries/data/mods/public/simulation/components/Identity.js
@@ -65,7 +65,7 @@
 		"</element>" +
 	"</optional>" +
 	"<optional>" +
-		"<element name='VisibleClasses' a:help='Optional list of space-separated classes applying to this entity. These classes will also be visible in various GUI elements. If the classes need spaces, underscores will be replaced with spaces. Choices include: Amphitheater, Archer, ArmyCamp, Arsenal, ArtilleryTower, Axeman, Barracks, Bireme, BoltShooter, BoltTower, Bribable, Camel, Cavalry, Champion, Chariot, Citizen, City, Civic, CivilCentre, Colony, Corral, Council, Crossbowman, Defensive, Dock, Dog, Economic, Elephant, ElephantStable, Embassy, Farmstead, Field, Fireship, FishingBoat, Forge, Fortress, Gate, Gladiator, Gymnasium, Hall, Healer, Hero, House, Infantry, IshtarGate, Javelineer, Library, Lighthouse, Maceman, Melee, Market, Mercenary, Military, Monument, Naval, Outpost, Palace, Palisade, Pikeman, Pillar, Pyramid, Quinquereme, Ram, Range, Ranged, Relic, Resource, RotaryMill, SentryTower, Ship, Shipyard, Siege, SiegeTower, SiegeWall, Slave, Slinger, Soldier, Spearman, Stable, Stoa, StoneThrower, StoneTower, Storehouse, Support, Swordsman, Syssiton, Temple, TempleOfAmun, TempleOfApedemak, TempleOfMars, TempleOfVesta, Theater, Tower, Town, Trade, Trader, Trireme, TriumphalArch, Village, Wall, Warship, Wonder, Worker.'>" +
+		"<element name='VisibleClasses' a:help='Optional list of space-separated classes applying to this entity. These classes will also be visible in various GUI elements. If the classes need spaces, underscores will be replaced with spaces. Choices include: Amphitheater, Archer, ArmyCamp, Arsenal, ArtilleryTower, Axeman, Barracks, Bireme, BoltShooter, BoltTower, Bribable, Builder, Camel, Cavalry, Champion, Chariot, Citizen, City, Civic, CivilCentre, Colony, Corral, Council, Crossbowman, Defensive, Dock, Dog, Economic, Elephant, ElephantStable, Embassy, Farmstead, Field, Fireship, FishingBoat, Forge, Fortress, Gate, Gladiator, Gymnasium, Hall, Healer, Hero, House, Infantry, IshtarGate, Javelineer, Library, Lighthouse, Maceman, Melee, Market, Mercenary, Military, Monument, Naval, Outpost, Palace, Palisade, Pikeman, Pillar, Pyramid, Quinquereme, Ram, Range, Ranged, Relic, Resource, RotaryMill, SentryTower, Ship, Shipyard, Siege, SiegeTower, SiegeWall, Slave, Slinger, Soldier, Spearman, Stable, Stoa, StoneThrower, StoneTower, Storehouse, Support, Swordsman, Syssiton, Temple, TempleOfAmun, TempleOfApedemak, TempleOfMars, TempleOfVesta, Theater, Tower, Town, Trade, Trader, Trireme, TriumphalArch, Village, Wall, Warship, Wonder, Worker.'>" +
 			"<attribute name='datatype'>" +
 				"<value>tokens</value>" +
 			"</attribute>" +
Index: binaries/data/mods/public/simulation/data/auras/units/elephant_worker.json
===================================================================
--- binaries/data/mods/public/simulation/data/auras/units/elephant_worker.json
+++ binaries/data/mods/public/simulation/data/auras/units/elephant_worker.json
@@ -1,6 +1,6 @@
 {
-	"affects": ["Worker"],
-	"auraDescription": "Workers +25% build rate.",
+	"affects": ["Builder"],
+	"auraDescription": "Builders +25% build rate.",
 	"auraName": "Elephant Workers",
 	"modifications": [
 		{ "value": "Builder/Rate", "multiply": 1.25 }
Index: binaries/data/mods/public/simulation/data/auras/units/heroes/athen_hero_pericles_1.json
===================================================================
--- binaries/data/mods/public/simulation/data/auras/units/heroes/athen_hero_pericles_1.json
+++ binaries/data/mods/public/simulation/data/auras/units/heroes/athen_hero_pericles_1.json
@@ -1,11 +1,11 @@
 {
 	"type": "range",
 	"radius": 60,
-	"affects": ["Worker"],
+	"affects": ["Builder"],
 	"modifications": [
 		{ "value": "Builder/Rate", "multiply": 1.15 }
 	],
 	"auraName": "Periclean Building Program",
-	"auraDescription": "Workers +15% build rate.",
+	"auraDescription": "Builders +15% build rate.",
 	"overlayIcon": "art/textures/ui/session/auras/build_bonus.png"
 }
Index: binaries/data/mods/public/simulation/data/auras/units/heroes/pers_hero_xerxes_i.json
===================================================================
--- binaries/data/mods/public/simulation/data/auras/units/heroes/pers_hero_xerxes_i.json
+++ binaries/data/mods/public/simulation/data/auras/units/heroes/pers_hero_xerxes_i.json
@@ -3,7 +3,7 @@
 	"radius": 60,
 	"affects": ["Worker"],
 	"modifications": [
-		{ "value": "Builder/Rate", "multiply": 1.15 },
+		{ "value": "Builder/Rate", "multiply": 1.15, "affects": "Buider" },
 		{ "value": "ResourceGatherer/BaseSpeed", "multiply": 1.15 }
 	],
 	"auraName": "Administrator",
Index: binaries/data/mods/public/simulation/data/auras/units/heroes/ptol_hero_ptolemy_i_1.json
===================================================================
--- binaries/data/mods/public/simulation/data/auras/units/heroes/ptol_hero_ptolemy_i_1.json
+++ binaries/data/mods/public/simulation/data/auras/units/heroes/ptol_hero_ptolemy_i_1.json
@@ -1,11 +1,11 @@
 {
 	"type": "range",
 	"radius": 60,
-	"affects": ["Worker"],
+	"affects": ["Builder"],
 	"modifications": [
 		{ "value": "Builder/Rate", "multiply": 1.1 }
 	],
 	"auraName": "Patron of Construction",
-	"auraDescription": "Workers +10% build rate.",
+	"auraDescription": "Builders +10% build rate.",
 	"overlayIcon": "art/textures/ui/session/auras/build_bonus.png"
 }
Index: binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
@@ -58,7 +58,7 @@
   </Health>
   <Identity>
     <Classes datatype="tokens">Human CitizenSoldier</Classes>
-    <VisibleClasses datatype="tokens">Citizen Worker Soldier Infantry</VisibleClasses>
+    <VisibleClasses datatype="tokens">Citizen Builder Worker Soldier Infantry</VisibleClasses>
     <GenericName>Infantry</GenericName>
     <Rank>Basic</Rank>
   </Identity>
Index: binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
@@ -59,7 +59,7 @@
   </Health>
   <Identity>
     <Classes datatype="tokens">FemaleCitizen</Classes>
-    <VisibleClasses datatype="tokens">Citizen Worker</VisibleClasses>
+    <VisibleClasses datatype="tokens">Citizen Builder Worker</VisibleClasses>
     <GenericName>Female Citizen</GenericName>
     <SelectionGroupName>template_unit_support_female_citizen</SelectionGroupName>
     <Phenotype>female</Phenotype>
Index: binaries/data/mods/public/simulation/templates/template_unit_support_slave.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_support_slave.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_support_slave.xml
@@ -40,9 +40,9 @@
     <Unhealable>true</Unhealable>
   </Health>
   <Identity>
-    <VisibleClasses datatype="tokens">Slave Worker</VisibleClasses>
     <GenericName>Slave</GenericName>
     <SelectionGroupName>template_unit_support_slave</SelectionGroupName>
+    <VisibleClasses datatype="tokens">Builder Worker Slave</VisibleClasses>
     <Tooltip>Gatherer with a finite life span. Bonused at mining and lumbering.</Tooltip>
   </Identity>
   <Loot>