diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index d75cd66..af984ae 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -10710,6 +10710,34 @@ public sealed class GameWindow : IDisposable
             gl.DepthMask(true);
         }
 
+        // FIX 2026-05-28 (post-third-visual-gate): render IndoorPass entities.
+        // EnvCellRenderer covers cell GEOMETRY (floor, walls baked into the
+        // cell's CellStruct). But cottages ALSO have IsBuildingShell entities
+        // — landblock-baked GfxObjs representing exterior wall slabs that
+        // aren't part of any cell's CellStruct. Pre-A8 rendered these via
+        // Dispatcher.Draw(set: IndoorPass); WB's algorithm assumes its
+        // StaticObjectManager.Render handles them in Step 4. Our EntitySet
+        // partition puts IsBuildingShell into IndoorPass (not OutdoorScenery),
+        // so Step 4's `Draw(set: OutdoorScenery)` misses them entirely.
+        // Result with the missing call: user reports "house missing lots of
+        // walls" — the cottage's exterior wall slabs aren't drawn.
+        //
+        // Render IndoorPass between Step 3 and Step 4, with the
+        // currentEnvCellIds filter narrowing cell stabs but NOT the building
+        // shells (they have no ParentCellId and pass through). Depth-test
+        // with DepthFunc.Less so cottage-A's near walls occlude cottage-B's
+        // far walls. NO stencil — we want them rendered unconditionally
+        // inside the camera-building.
+        if (camBuildings.Count > 0)
+        {
+            _meshShader!.Use();
+            _wbDrawDispatcher!.Draw(camera, _worldState.LandblockEntries, frustum,
+                neverCullLandblockId: playerLb,
+                visibleCellIds: currentEnvCellIds,
+                animatedEntityIds: animatedIds,
+                set: AcDream.App.Rendering.Wb.WbDrawDispatcher.EntitySet.IndoorPass);
+        }
+
         EmitEnvCellProbe(camBuildings.Count, otherBuildings.Count, currentEnvCellIds.Count);
 
         // Step 4: stencil-gated outdoor (terrain + scenery + static objects).