diff --git a/Assets/Tests/EditMode/Simulation/ConstructionSystemTests.cs b/Assets/Tests/EditMode/Simulation/ConstructionSystemTests.cs
index 259fca8..40f38eb 100644
--- a/Assets/Tests/EditMode/Simulation/ConstructionSystemTests.cs
+++ b/Assets/Tests/EditMode/Simulation/ConstructionSystemTests.cs
@@ -391,6 +391,36 @@ public void ValidatePlacement_InfluenceUsesOwnLivingCompletedFootprints_AtDistan
                 "an active site supplies spacing, never construction influence");
         }
 
+        [Test]
+        public void ValidatePlacement_EveryCompletedBuildingExtendsTheZone_ItsSiteDoesNot()
+        {
+            // Corrected D-108: the anchor list is open. A completed Barracks —
+            // a role the old HQ/Storage/Power list excluded — pushes the zone
+            // outward by its own radius, so the probe at footprint distance 6
+            // is placeable even though no HQ/Storage/Power anchor reaches it.
+            var completed = new Fixture(configure: e => e.TryAddField(1, new GridPos2D(60, 60), 9000));
+            Assert.That(completed.Construction.PlaceCompletedBuilding(0, 3, 0, 0).IsValid, Is.True,
+                "far-away HQ prerequisite; its own radius never reaches the probe area");
+            Assert.That(completed.Construction.PlaceCompletedBuilding(0, 7, 30, 30).IsValid, Is.True,
+                "completed Barracks outside every old-list anchor radius");
+            Assert.That(completed.Construction.ValidatePlacement(0, 5, 38, 30), Is.EqualTo(CommandResultCode.Applied),
+                "footprint distance 6 to the completed Barracks is inside influence (corrected D-108)");
+
+            // The SAME building as an active site does not: create the site
+            // next to a bootstrap anchor, remove the anchor, and the probe at
+            // the identical distance must fall out of the zone again.
+            var siteOnly = new Fixture(configure: e => e.TryAddField(1, new GridPos2D(60, 60), 9000));
+            Assert.That(siteOnly.Construction.PlaceCompletedBuilding(0, 3, 0, 0).IsValid, Is.True, "HQ prerequisite");
+            Assert.That(siteOnly.Construction.PlaceCompletedBuilding(0, 5, 0, 4).IsValid, Is.True, "Power prerequisite");
+            EntityId bootstrap = siteOnly.Construction.PlaceCompletedBuilding(0, 3, 24, 30);
+            Assert.That(bootstrap.IsValid, Is.True, "bootstrap anchor so the Barracks site validates at all");
+            siteOnly.Step(1); // commit the balance (the Barracks power draw is evaluated)
+            Assert.That(siteOnly.Construction.TryPlaceBuilding(0, 7, 30, 30), Is.True, "create the active Barracks site");
+            Assert.That(siteOnly.Entities.DespawnUnit(bootstrap), Is.True, "remove the bootstrap anchor");
+            Assert.That(siteOnly.Construction.ValidatePlacement(0, 5, 38, 30), Is.EqualTo(CommandResultCode.RejectedInvalidTarget),
+                "the Barracks SITE supplies spacing, never construction influence");
+        }
+
         [Test]
         public void ValidatePlacement_RequiresOneEmptyRingAroundBuildingsAndSites()
         {
diff --git a/Assets/_Project/Scripts/Simulation/Construction/ConstructionSystem.cs b/Assets/_Project/Scripts/Simulation/Construction/ConstructionSystem.cs
index 5bc54dc..044eaf5 100644
--- a/Assets/_Project/Scripts/Simulation/Construction/ConstructionSystem.cs
+++ b/Assets/_Project/Scripts/Simulation/Construction/ConstructionSystem.cs
@@ -176,12 +176,12 @@ public sealed class ConstructionSystem : IStatefulSimSystem
 
         /// <summary>
         /// Maximum footprint-aware Chebyshev distance from an own construction
-        /// anchor (D-104). Construction anchors are exactly the own, living and
-        /// COMPLETED HQ, Storage and Power buildings — every other role does NOT
-        /// extend the build zone (see IsInsideBuildInfluence). The corrected
-        /// D-108 opens this anchor list to every own completed building; that
-        /// rule change is a separate PR (RulesHash64 moves) and is NOT yet
-        /// reflected here.
+        /// anchor (D-104). Under the corrected D-108 every own, living and
+        /// COMPLETED building is an anchor and pushes the build zone outward
+        /// by its own radius — construction sites never do (see
+        /// IsInsideBuildInfluence). Deliberately accepted (D-108): a chain of
+        /// cheap buildings can push the zone across the map; expansion is
+        /// meant to be coupled to the economy.
         /// </summary>
         public const int BuildInfluenceRadiusCells = 8;
 
@@ -1103,16 +1103,27 @@ private bool FootprintIsWalkable(int originX, int originY)
             return true;
         }
 
+        /// <summary>
+        /// Corrected D-108 anchor rule: EVERY own, living and completed
+        /// building extends the build zone by its own
+        /// <see cref="BuildInfluenceRadiusCells"/> — no role list. A
+        /// construction site is NOT an anchor even though it already carries
+        /// its definition role (16.3, #44), so the finished-only rule is
+        /// checked explicitly through <see cref="IsActiveSite"/>, the same
+        /// register the economy's power and capacity scans use. Deliberately
+        /// accepted (D-108): a chain of cheap buildings can push the build
+        /// zone across the map — that coupling of expansion to the economy
+        /// is the decided behavior, not a defect.
+        /// </summary>
         private bool IsInsideBuildInfluence(byte playerSlot, int originX, int originY)
         {
             for (int i = 0; i < MaxBuildings; i++)
             {
                 ref readonly PlacementState placement = ref _buildings[i];
                 if (!placement.IsActive) continue;
-                if (!SimDefinitions.TryGetBuilding(placement.BuildingDefId, out SimBuildingDefinition def)) continue;
-                if (def.Role != UnitRole.HQ && def.Role != UnitRole.Storage && def.Role != UnitRole.Power) continue;
 
                 EntityId id = UnitCommandStateView.ToEntityId(placement.RawEntityId);
+                if (IsActiveSite(id)) continue; // finished only: a site never extends the zone
                 if (!_entityManager.TryGetUnit(id, out UnitState unit) || unit.PlayerId != playerSlot) continue;
                 if (FootprintDistance(originX, originY, placement.OriginX, placement.OriginY) <= BuildInfluenceRadiusCells)
                 {
diff --git a/tools/Nova.SimRunner.Tests/ConstructionSystemTests.cs b/tools/Nova.SimRunner.Tests/ConstructionSystemTests.cs
index bdba8b6..326f231 100644
--- a/tools/Nova.SimRunner.Tests/ConstructionSystemTests.cs
+++ b/tools/Nova.SimRunner.Tests/ConstructionSystemTests.cs
@@ -391,6 +391,36 @@ public void ValidatePlacement_InfluenceUsesOwnLivingCompletedFootprints_AtDistan
                 "an active site supplies spacing, never construction influence");
         }
 
+        [Test]
+        public void ValidatePlacement_EveryCompletedBuildingExtendsTheZone_ItsSiteDoesNot()
+        {
+            // Corrected D-108: the anchor list is open. A completed Barracks —
+            // a role the old HQ/Storage/Power list excluded — pushes the zone
+            // outward by its own radius, so the probe at footprint distance 6
+            // is placeable even though no HQ/Storage/Power anchor reaches it.
+            var completed = new Fixture(configure: e => e.TryAddField(1, new GridPos2D(60, 60), 9000));
+            Assert.That(completed.Construction.PlaceCompletedBuilding(0, 3, 0, 0).IsValid, Is.True,
+                "far-away HQ prerequisite; its own radius never reaches the probe area");
+            Assert.That(completed.Construction.PlaceCompletedBuilding(0, 7, 30, 30).IsValid, Is.True,
+                "completed Barracks outside every old-list anchor radius");
+            Assert.That(completed.Construction.ValidatePlacement(0, 5, 38, 30), Is.EqualTo(CommandResultCode.Applied),
+                "footprint distance 6 to the completed Barracks is inside influence (corrected D-108)");
+
+            // The SAME building as an active site does not: create the site
+            // next to a bootstrap anchor, remove the anchor, and the probe at
+            // the identical distance must fall out of the zone again.
+            var siteOnly = new Fixture(configure: e => e.TryAddField(1, new GridPos2D(60, 60), 9000));
+            Assert.That(siteOnly.Construction.PlaceCompletedBuilding(0, 3, 0, 0).IsValid, Is.True, "HQ prerequisite");
+            Assert.That(siteOnly.Construction.PlaceCompletedBuilding(0, 5, 0, 4).IsValid, Is.True, "Power prerequisite");
+            EntityId bootstrap = siteOnly.Construction.PlaceCompletedBuilding(0, 3, 24, 30);
+            Assert.That(bootstrap.IsValid, Is.True, "bootstrap anchor so the Barracks site validates at all");
+            siteOnly.Step(1); // commit the balance (the Barracks power draw is evaluated)
+            Assert.That(siteOnly.Construction.TryPlaceBuilding(0, 7, 30, 30), Is.True, "create the active Barracks site");
+            Assert.That(siteOnly.Entities.DespawnUnit(bootstrap), Is.True, "remove the bootstrap anchor");
+            Assert.That(siteOnly.Construction.ValidatePlacement(0, 5, 38, 30), Is.EqualTo(CommandResultCode.RejectedInvalidTarget),
+                "the Barracks SITE supplies spacing, never construction influence");
+        }
+
         [Test]
         public void ValidatePlacement_RequiresOneEmptyRingAroundBuildingsAndSites()
         {