Index: ps/trunk/binaries/data/mods/public/simulation/components/Foundation.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/components/Foundation.js
+++ ps/trunk/binaries/data/mods/public/simulation/components/Foundation.js
@@ -1,7 +1,9 @@
 function Foundation() {}
 
 Foundation.prototype.Schema =
-	"<empty/>";
+	"<element name='BuildTimeModifier' a:help='Effect for having multiple builders.'>" +
+		"<ref name='nonNegativeDecimal'/>" +
+	"</element>";
 
 Foundation.prototype.Init = function()
 {
@@ -15,7 +17,8 @@
 	this.builders = new Map(); // Map of builder entities to their work per second
 	this.totalBuilderRate = 0; // Total amount of work the builders do each second
 	this.buildMultiplier = 1; // Multiplier for the amount of work builders do
-	this.buildTimePenalty = 0.7; // Penalty for having multiple builders
+
+	this.buildTimeModifier = +this.template.BuildTimeModifier;
 
 	this.previewEntity = INVALID_ENTITY;
 };
@@ -220,7 +223,7 @@
 Foundation.prototype.CalculateBuildMultiplier = function(num)
 {
 	// Avoid division by zero, in particular 0/0 = NaN which isn't reliably serialized
-	return num < 2 ? 1 : Math.pow(num, this.buildTimePenalty) / num;
+	return num < 2 ? 1 : Math.pow(num, this.buildTimeModifier) / num;
 };
 
 Foundation.prototype.SetBuildMultiplier = function()
Index: ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Foundation.js
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Foundation.js
+++ ps/trunk/binaries/data/mods/public/simulation/components/tests/test_Foundation.js
@@ -139,7 +139,9 @@
 		TS_ASSERT_EQUALS(template, "construction|" + finalTemplate);
 		return previewEnt;
 	};
-	cmpFoundation = ConstructComponent(foundationEnt, "Foundation", {});
+	cmpFoundation = ConstructComponent(foundationEnt, "Foundation", {
+		"BuildTimeModifier": "0.7"
+	});
 	cmpFoundation.InitialiseConstruction(finalTemplate);
 
 	TS_ASSERT_EQUALS(cmpFoundation.finalTemplateName, finalTemplate);
@@ -149,8 +151,8 @@
 	// BUILDER COUNT, BUILD RATE, TIME REMAINING
 	AddMock(10, IID_Builder, { "GetRate": () => 1.0 });
 	AddMock(11, IID_Builder, { "GetRate": () => 1.0 });
-	let twoBuilderMultiplier = Math.pow(2, cmpFoundation.buildTimePenalty) / 2;
-	let threeBuilderMultiplier = Math.pow(3, cmpFoundation.buildTimePenalty) / 3;
+	let twoBuilderMultiplier = Math.pow(2, cmpFoundation.buildTimeModifier) / 2;
+	let threeBuilderMultiplier = Math.pow(3, cmpFoundation.buildTimeModifier) / 3;
 
 	TS_ASSERT_EQUALS(cmpFoundation.CalculateBuildMultiplier(1), 1);
 	TS_ASSERT_EQUALS(cmpFoundation.CalculateBuildMultiplier(2), twoBuilderMultiplier);
Index: ps/trunk/binaries/data/mods/public/simulation/templates/special/filter/foundation.xml
===================================================================
--- ps/trunk/binaries/data/mods/public/simulation/templates/special/filter/foundation.xml
+++ ps/trunk/binaries/data/mods/public/simulation/templates/special/filter/foundation.xml
@@ -8,7 +8,9 @@
   <Fogging merge=""/>
   <Footprint merge=""/>
   <!-- Add the Foundation component, to deal with the construction process. -->
-  <Foundation replace=""/>
+  <Foundation replace="">
+    <BuildTimeModifier>0.7</BuildTimeModifier>
+  </Foundation>
   <Health>
     <Initial>1</Initial>
   </Health>