diff --git a/OpenRA.Mods.Common/AI/AIUtils.cs b/OpenRA.Mods.Common/AI/AIUtils.cs
new file mode 100644
index 0000000000..477f985bcb
--- /dev/null
+++ b/OpenRA.Mods.Common/AI/AIUtils.cs
@@ -0,0 +1,51 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.AI
+{
+	public enum BuildingType { Building, Defense, Refinery }
+
+	public class CaptureTarget<TInfoType> where TInfoType : class, ITraitInfoInterface
+	{
+		internal readonly Actor Actor;
+		internal readonly TInfoType Info;
+
+		/// <summary>The order string given to the capturer so they can capture this actor.</summary>
+		/// <example>ExternalCaptureActor</example>
+		internal readonly string OrderString;
+
+		internal CaptureTarget(Actor actor, string orderString)
+		{
+			Actor = actor;
+			Info = actor.Info.TraitInfoOrDefault<TInfoType>();
+			OrderString = orderString;
+		}
+	}
+
+	public static class AIUtils
+	{
+		public static bool IsAreaAvailable<T>(World world, Player player, Map map, int radius, HashSet<string> terrainTypes)
+		{
+			var cells = world.ActorsHavingTrait<T>().Where(a => a.Owner == player);
+
+			// TODO: Properly check building foundation rather than 3x3 area.
+			return cells.Select(a => map.FindTilesInCircle(a.Location, radius)
+				.Count(c => map.Contains(c) && terrainTypes.Contains(map.GetTerrainInfo(c).Type) &&
+					Util.AdjacentCells(world, Target.FromCell(world, c))
+						.All(ac => terrainTypes.Contains(map.GetTerrainInfo(ac).Type))))
+							.Any(availableCells => availableCells > 0);
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/AI/BaseBuilder.cs b/OpenRA.Mods.Common/AI/BaseBuilder.cs
index aa17421c22..1774231633 100644
--- a/OpenRA.Mods.Common/AI/BaseBuilder.cs
+++ b/OpenRA.Mods.Common/AI/BaseBuilder.cs
@@ -77,7 +77,7 @@ namespace OpenRA.Mods.Common.AI
 
 			if (waterState == Water.NotChecked)
 			{
-				if (ai.IsAreaAvailable<BaseProvider>(ai.Info.MaxBaseRadius, ai.Info.WaterTerrainTypes))
+				if (AIUtils.IsAreaAvailable<BaseProvider>(ai.World, ai.Player, ai.Map, ai.Info.MaxBaseRadius, ai.Info.WaterTerrainTypes))
 					waterState = Water.EnoughWater;
 				else
 				{
@@ -259,7 +259,7 @@ namespace OpenRA.Mods.Common.AI
 			// Only consider building this if there is enough water inside the base perimeter and there are close enough adjacent buildings
 			if (waterState == Water.EnoughWater && ai.Info.NewProductionCashThreshold > 0
 				&& playerResources.Resources > ai.Info.NewProductionCashThreshold
-				&& ai.IsAreaAvailable<GivesBuildableArea>(ai.Info.CheckForWaterRadius, ai.Info.WaterTerrainTypes))
+				&& AIUtils.IsAreaAvailable<GivesBuildableArea>(ai.World, ai.Player, ai.Map, ai.Info.CheckForWaterRadius, ai.Info.WaterTerrainTypes))
 			{
 				var navalproduction = GetProducibleBuilding(ai.Info.BuildingCommonNames.NavalProduction, buildableThings);
 				if (navalproduction != null && HasSufficientPowerForActor(navalproduction))
@@ -313,7 +313,8 @@ namespace OpenRA.Mods.Common.AI
 				// and any structure providing buildable area close enough to that water.
 				// TODO: Extend this check to cover any naval structure, not just production.
 				if (ai.Info.BuildingCommonNames.NavalProduction.Contains(name)
-					&& (waterState == Water.NotEnoughWater || !ai.IsAreaAvailable<GivesBuildableArea>(ai.Info.CheckForWaterRadius, ai.Info.WaterTerrainTypes)))
+					&& (waterState == Water.NotEnoughWater
+						|| !AIUtils.IsAreaAvailable<GivesBuildableArea>(ai.World, ai.Player, ai.Map, ai.Info.CheckForWaterRadius, ai.Info.WaterTerrainTypes)))
 					continue;
 
 				// Will this put us into low power?
diff --git a/OpenRA.Mods.Common/AI/HackyAI.cs b/OpenRA.Mods.Common/AI/HackyAI.cs
index 387fb4cfa2..67d469db34 100644
--- a/OpenRA.Mods.Common/AI/HackyAI.cs
+++ b/OpenRA.Mods.Common/AI/HackyAI.cs
@@ -21,23 +21,6 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.Common.AI
 {
-	class CaptureTarget<TInfoType> where TInfoType : class, ITraitInfoInterface
-	{
-		internal readonly Actor Actor;
-		internal readonly TInfoType Info;
-
-		/// <summary>The order string given to the capturer so they can capture this actor.</summary>
-		/// <example>ExternalCaptureActor</example>
-		internal readonly string OrderString;
-
-		internal CaptureTarget(Actor actor, string orderString)
-		{
-			Actor = actor;
-			Info = actor.Info.TraitInfoOrDefault<TInfoType>();
-			OrderString = orderString;
-		}
-	}
-
 	public sealed class HackyAIInfo : IBotInfo, ITraitInfo
 	{
 		public class UnitCategories
@@ -264,8 +247,6 @@ namespace OpenRA.Mods.Common.AI
 		public object Create(ActorInitializer init) { return new HackyAI(this, init); }
 	}
 
-	public enum BuildingType { Building, Defense, Refinery }
-
 	public sealed class HackyAI : ITick, IBot, INotifyDamage
 	{
 		public MersenneTwister Random { get; private set; }
@@ -390,18 +371,6 @@ namespace OpenRA.Mods.Common.AI
 				resourceTypeIndices.Set(tileset.GetTerrainIndex(t.TerrainType), true);
 		}
 
-		public bool IsAreaAvailable<T>(int radius, HashSet<string> terrainTypes)
-		{
-			var cells = World.ActorsHavingTrait<T>().Where(a => a.Owner == Player);
-
-			// TODO: Properly check building foundation rather than 3x3 area.
-			return cells.Select(a => Map.FindTilesInCircle(a.Location, radius)
-				.Count(c => Map.Contains(c) && terrainTypes.Contains(Map.GetTerrainInfo(c).Type) &&
-					Util.AdjacentCells(World, Target.FromCell(World, c))
-						.All(ac => terrainTypes.Contains(Map.GetTerrainInfo(ac).Type))))
-							.Any(availableCells => availableCells > 0);
-		}
-
 		public void QueueOrder(Order order)
 		{
 			orders.Enqueue(order);
diff --git a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
index fe37cc87c9..60199610aa 100644
--- a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
+++ b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
@@ -122,6 +122,7 @@
     <Compile Include="Activities\Wait.cs" />
     <Compile Include="Activities\WaitForTransport.cs" />
     <Compile Include="ActorExts.cs" />
+    <Compile Include="AI\AIUtils.cs" />
     <Compile Include="AI\AttackOrFleeFuzzy.cs" />
     <Compile Include="AI\BaseBuilder.cs" />
     <Compile Include="AI\HackyAI.cs" />