diff --git a/Assets/Scripts/Drag&Drop/DraggablePlaceholder.cs b/Assets/Scripts/Drag&Drop/DraggablePlaceholder.cs
index a7c0898..61cc41a 100644
--- a/Assets/Scripts/Drag&Drop/DraggablePlaceholder.cs
+++ b/Assets/Scripts/Drag&Drop/DraggablePlaceholder.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -20,6 +21,8 @@ public abstract class DraggablePlaceholder : MonoBehaviour
     protected Rect _lvlBoundsCache;
     protected bool _canBePlacedHere;
 
+    protected static bool alreadyHasUnit = false;
+
     private List<SpriteRenderer> _outlineRenderers = new List<SpriteRenderer>();
     public List<SpriteRenderer> OutlineRenderers
     {
@@ -50,14 +53,15 @@ public abstract class DraggablePlaceholder : MonoBehaviour
     {
         if (!Input.GetMouseButton(0))
         {
-            if (_canBePlacedHere)
+            if (_canBePlacedHere && !alreadyHasUnit)
             {
                 ResourceManager.Instance.Remove(Rock, Wood, Food);
                 Place();
+                alreadyHasUnit = true;
             }
             Destroy(gameObject);
         }
-
+        alreadyHasUnit = AlreadyHasUnit();
         _canBePlacedHere = CanBePlacedHere();
         UpdatePosition();
 
@@ -96,6 +100,11 @@ public abstract class DraggablePlaceholder : MonoBehaviour
             && ResourceManager.Instance.EnoughFor(Rock, Wood, Food);
     }
 
+    public virtual bool AlreadyHasUnit()
+    {
+        return !_lvlBoundsCache.Contains(transform.position);
+    }
+
     /// <summary>
     /// how your character will appear depending on the validity of the tile you want to put them on<br/>
     /// default behaviour is changes color of all sprite renderers of the Outline Transform to red if invalid, green otherwise
diff --git a/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs b/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
index 9fbe0b7..b02a93f 100644
--- a/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
+++ b/Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs
@@ -16,7 +16,7 @@ public class ObjectPlaceholder : DraggablePlaceholder
         return !positionIsCollidable 
             && _lvlBoundsCache.Contains(transform.position)
             && ResourceManager.Instance.EnoughFor(Rock, Wood, Food)
-            && (Prefab.GetComponent<Building>()
-            || ResourceManager.Instance.EnoughPopulationFor(defaultUnitCost));
+            && (Prefab.GetComponent<Building>() 
+            || ResourceManager.Instance.EnoughPopulationFor(defaultUnitCost)) ;
     }
 }
\ No newline at end of file
diff --git a/Assets/Scripts/Drag&Drop/TilePlaceholder.cs b/Assets/Scripts/Drag&Drop/TilePlaceholder.cs
index a848ad7..9ac48ca 100644
--- a/Assets/Scripts/Drag&Drop/TilePlaceholder.cs
+++ b/Assets/Scripts/Drag&Drop/TilePlaceholder.cs
@@ -6,5 +6,6 @@ public class TilePlaceholder : DraggablePlaceholder
     public override void Place()
     {
         LevelManager.Instance.DynamicTilemap.SetTile(Vector3Int.RoundToInt(transform.position), Tile);
+        alreadyHasUnit = true;
     }
 }
\ No newline at end of file