diff --git a/NewHorizons/Builder/General/GroupBuilder.cs b/NewHorizons/Builder/General/GroupBuilder.cs
new file mode 100644
index 00000000..828a7117
--- /dev/null
+++ b/NewHorizons/Builder/General/GroupBuilder.cs
@@ -0,0 +1,30 @@
+using UnityEngine;
+using Logger = NewHorizons.Utility.Logger;
+
+namespace NewHorizons.Builder.General;
+
+public static class GroupBuilder
+{
+    /// <summary>
+    /// puts groups on objects.
+    /// run this before the gameobject is active.
+    /// </summary>
+    public static void Make(GameObject go, Sector sector)
+    {
+        Logger.LogVerbose($"putting groups on {go} (linked to {sector})");
+        if (!sector)
+        {
+            Logger.LogWarning("tried to put groups on a null sector");
+            return;
+        }
+        if (go.activeInHierarchy)
+        {
+            Logger.LogWarning("tried to put groups on an active gameobject");
+            return;
+        }
+
+        go.GetAddComponent<SectorCullGroup>()._sector = sector;
+        go.GetAddComponent<SectorCollisionGroup>()._sector = sector;
+        go.GetAddComponent<SectorLightsCullGroup>()._sector = sector;
+    }
+}
\ No newline at end of file
diff --git a/NewHorizons/Builder/Props/DetailBuilder.cs b/NewHorizons/Builder/Props/DetailBuilder.cs
index ae7a63f7..2c849ecf 100644
--- a/NewHorizons/Builder/Props/DetailBuilder.cs
+++ b/NewHorizons/Builder/Props/DetailBuilder.cs
@@ -1,3 +1,4 @@
+using NewHorizons.Builder.General;
 using NewHorizons.External.Configs;
 using NewHorizons.External.Modules;
 using NewHorizons.Handlers;
@@ -100,6 +101,7 @@ namespace NewHorizons.Builder.Props
 
             prop.transform.localScale = detail.scale != 0 ? Vector3.one * detail.scale : prefab.transform.localScale;
 
+            if (!detail.keepLoaded) GroupBuilder.Make(prop, sector);
             prop.SetActive(true);
 
             if (prop == null) return null;