diff --git a/Scripts/System/GridManager.cs b/Scripts/System/GridManager.cs
index bf17121..4897280 100644
--- a/Scripts/System/GridManager.cs
+++ b/Scripts/System/GridManager.cs
@@ -1,31 +1,68 @@
 #nullable enable
+using System;
 using System.Collections.Generic;
 using Godot;
 
 namespace AceFieldNewHorizon.Scripts.System;
 
+public enum GridLayer
+{
+    Ground,    // Base layer (e.g., terrain, floors)
+    Building,  // Main building layer
+    Decoration // Additional layer for decorations, effects, etc.
+}
+
 public partial class GridManager : Node
 {
-    private Dictionary<Vector2I, Node2D> _grid = new();
+    private Dictionary<GridLayer, Dictionary<Vector2I, Node2D>> _layers = new();
 
-    public bool IsCellFree(Vector2I cell)
+    public GridManager()
     {
-        return !_grid.ContainsKey(cell);
+        // Initialize all layers
+        foreach (GridLayer layer in Enum.GetValues(typeof(GridLayer)))
+        {
+            _layers[layer] = new Dictionary<Vector2I, Node2D>();
+        }
     }
 
-    public void OccupyCell(Vector2I cell, Node2D building)
+    public bool IsCellFree(Vector2I cell, GridLayer layer = GridLayer.Building)
     {
-        _grid[cell] = building;
+        return !_layers[layer].ContainsKey(cell);
     }
 
-    public void FreeCell(Vector2I cell)
+    public void OccupyCell(Vector2I cell, Node2D building, GridLayer layer = GridLayer.Building)
     {
-        _grid.Remove(cell);
+        _layers[layer][cell] = building;
     }
 
-    public Node2D? GetBuildingAtCell(Vector2I cell)
+    public void FreeCell(Vector2I cell, GridLayer layer = GridLayer.Building)
     {
-        return _grid.GetValueOrDefault(cell);
+        if (_layers[layer].ContainsKey(cell))
+            _layers[layer].Remove(cell);
+    }
+
+    public Node2D? GetBuildingAtCell(Vector2I cell, GridLayer layer = GridLayer.Building)
+    {
+        return _layers[layer].GetValueOrDefault(cell);
+    }
+
+    public bool IsAnyCellOccupied(Vector2I cell, params GridLayer[] layers)
+    {
+        if (layers.Length == 0)
+        {
+            // Check all layers if none specified
+            foreach (var layer in _layers.Values)
+            {
+                if (layer.ContainsKey(cell)) return true;
+            }
+            return false;
+        }
+
+        foreach (var layer in layers)
+        {
+            if (_layers[layer].ContainsKey(cell)) return true;
+        }
+        return false;
     }
 }
 
diff --git a/Scripts/System/PlacementManager.cs b/Scripts/System/PlacementManager.cs
index 7dd4021..608e1fb 100644
--- a/Scripts/System/PlacementManager.cs
+++ b/Scripts/System/PlacementManager.cs
@@ -1,3 +1,4 @@
+using System;
 using AceFieldNewHorizon.Scripts.Tiles;
 using Godot;
 
@@ -8,14 +9,16 @@ public partial class PlacementManager : Node2D
     [Export] public GridManager Grid { get; set; }
     [Export] public BuildingRegistry Registry { get; set; }
 
-    private string _currentBuildingId = "miner";
-
+    private string _currentBuildingId = "wall";
+    private GridLayer _currentLayer = GridLayer.Building; // Default layer
     private Vector2I _hoveredCell;
     private BaseTile _ghostBuilding;
+    private float _currentRotation = 0f;
 
-    public void SetCurrentBuilding(string buildingId)
+    public void SetCurrentBuilding(string buildingId, GridLayer layer = GridLayer.Building)
     {
         _currentBuildingId = buildingId;
+        _currentLayer = layer;
 
         // Replace ghost immediately
         if (_ghostBuilding == null) return;
@@ -23,10 +26,17 @@ public partial class PlacementManager : Node2D
         _ghostBuilding = null;
     }
 
-    // Add this field to PlacementManager
-    private float _currentRotation = 0f;
+    public void SetCurrentLayer(GridLayer layer)
+    {
+        _currentLayer = layer;
+        // Update ghost building if needed
+        if (_ghostBuilding != null)
+        {
+            _ghostBuilding.QueueFree();
+            _ghostBuilding = null;
+        }
+    }
 
-    // Add this method to handle rotation
     private void RotateGhost(bool reverse = false)
     {
         if (_ghostBuilding == null) return;
@@ -56,6 +66,8 @@ public partial class PlacementManager : Node2D
             _ghostBuilding = (BaseTile)scene.Instantiate();
             _ghostBuilding.SetGhostMode(true);
             _ghostBuilding.RotationDegrees = _currentRotation;
+            _ghostBuilding.ZAsRelative = false;
+            _ghostBuilding.ZIndex = (int)_currentLayer; // Use layer as Z-index
             AddChild(_ghostBuilding);
         }
 
@@ -68,17 +80,18 @@ public partial class PlacementManager : Node2D
             Position = centerPos,
             CollideWithBodies = true,
             CollideWithAreas = true,
-            CollisionMask = uint.MaxValue // check against all layers/masks
-            // Exclude = new Godot.Collections.Array<Rid>() // optional, see below
+            CollisionMask = uint.MaxValue
         };
 
         var collision = spaceState.IntersectPoint(query, 8);
-        var canPlace = Grid.IsCellFree(_hoveredCell) && collision.Count == 0;
+        
+        // Check if the current cell is free in the current layer
+        var canPlace = Grid.IsCellFree(_hoveredCell, _currentLayer) && 
+                      !Grid.IsAnyCellOccupied(_hoveredCell, GetBlockingLayers());
 
         _ghostBuilding.Position = placementPos;
         _ghostBuilding.SetGhostMode(canPlace);
 
-
         // Left click to place
         if (Input.IsActionPressed("build_tile") && canPlace)
         {
@@ -87,26 +100,42 @@ public partial class PlacementManager : Node2D
 
             _ghostBuilding.FinalizePlacement();
             _ghostBuilding.RotationDegrees = _currentRotation;
+            _ghostBuilding.ZIndex = (int)_currentLayer;
 
             var buildingData = Registry.GetBuilding(_currentBuildingId);
-            Grid.OccupyCell(_hoveredCell, _ghostBuilding);
+            Grid.OccupyCell(_hoveredCell, _ghostBuilding, _currentLayer);
 
             if (buildingData is { BuildTime: > 0f })
                 _ghostBuilding.StartConstruction(buildingData.BuildTime);
 
+            // Create new ghost for next placement
             _ghostBuilding = (BaseTile)scene.Instantiate();
             _ghostBuilding.SetGhostMode(true);
             _ghostBuilding.RotationDegrees = _currentRotation;
+            _ghostBuilding.ZAsRelative = false;
+            _ghostBuilding.ZIndex = (int)_currentLayer;
             AddChild(_ghostBuilding);
         }
 
-        if (Input.IsActionPressed("destroy_tile") && !Grid.IsCellFree(_hoveredCell))
+        if (Input.IsActionPressed("destroy_tile") && !Grid.IsCellFree(_hoveredCell, _currentLayer))
         {
-            // Right click to destroy
-            var building = Grid.GetBuildingAtCell(_hoveredCell);
+            // Right click to destroy from current layer
+            var building = Grid.GetBuildingAtCell(_hoveredCell, _currentLayer);
             if (building == null) return;
             building.QueueFree();
-            Grid.FreeCell(_hoveredCell);
+            Grid.FreeCell(_hoveredCell, _currentLayer);
         }
     }
+
+    // Define which layers should block placement
+    private GridLayer[] GetBlockingLayers()
+    {
+        return _currentLayer switch
+        {
+            GridLayer.Ground => new[] { GridLayer.Ground },
+            GridLayer.Building => new[] { GridLayer.Ground, GridLayer.Building },
+            GridLayer.Decoration => new[] { GridLayer.Ground, GridLayer.Building, GridLayer.Decoration },
+            _ => []
+        };
+    }
 }
\ No newline at end of file