diff --git a/src/app/qml/UserDetailDialog.qml b/src/app/qml/UserDetailDialog.qml
index 7ab139c0d..e01557e86 100644
--- a/src/app/qml/UserDetailDialog.qml
+++ b/src/app/qml/UserDetailDialog.qml
@@ -300,7 +300,7 @@ Kirigami.Dialog {
             }
 
             QQC2.Button {
-                visible: root.room.canSendState("m.room.power_levels")
+                visible: root.room.canSendState("m.room.power_levels") && !(root.room.roomCreatorHasUltimatePowerLevel() && root.room.isCreator(root.user.id))
                 text: i18nc("@action:button Set the power level (such as 'Admin') for this user", "Set Power Level")
                 icon.name: "document-edit-symbolic"
                 display: QQC2.AbstractButton.IconOnly
diff --git a/src/libneochat/enums/powerlevel.cpp b/src/libneochat/enums/powerlevel.cpp
index e80addcf4..534f951b6 100644
--- a/src/libneochat/enums/powerlevel.cpp
+++ b/src/libneochat/enums/powerlevel.cpp
@@ -12,6 +12,10 @@ QString PowerLevel::nameForLevel(Level level)
         return i18n("Moderator");
     case PowerLevel::Admin:
         return i18n("Admin");
+    case PowerLevel::Owner:
+        return i18nc("The person that owns a room", "Owner");
+    case PowerLevel::Creator:
+        return i18nc("The person that created a room", "Creator");
     case PowerLevel::Mute:
         return i18n("Mute");
     case PowerLevel::Custom:
@@ -30,6 +34,8 @@ int PowerLevel::valueForLevel(Level level)
         return 50;
     case PowerLevel::Admin:
         return 100;
+    case PowerLevel::Owner:
+        return 150;
     case PowerLevel::Mute:
         return -1;
     default:
@@ -46,8 +52,12 @@ PowerLevel::Level PowerLevel::levelForValue(int value)
         return PowerLevel::Moderator;
     case 100:
         return PowerLevel::Admin;
+    case 150:
+        return PowerLevel::Owner;
     case -1:
         return PowerLevel::Mute;
+    case std::numeric_limits<int>::max():
+        return PowerLevel::Creator;
     default:
         return PowerLevel::Custom;
     }
diff --git a/src/libneochat/enums/powerlevel.h b/src/libneochat/enums/powerlevel.h
index 173c969f6..87cc23d1d 100644
--- a/src/libneochat/enums/powerlevel.h
+++ b/src/libneochat/enums/powerlevel.h
@@ -31,10 +31,12 @@ public:
     enum Level {
         Member, /**< A basic member. */
         Moderator, /**< A moderator with enhanced powers. */
-        Admin, /**< The highest power level in the room. */
+        Admin, /**< Power level 100. */
+        Owner, /**< Power level 150. */
         Mute, /**< The level to remove posting privileges. */
         NUMLevels,
         Custom, /**< A non-standard value. Intentionally after NUMLevels so it doesn't appear in the model. */
+        Creator, /**< The user creating the (co-)creating the room. */
     };
     Q_ENUM(Level);
 
diff --git a/src/libneochat/neochatroom.h b/src/libneochat/neochatroom.h
index 0c9c29c08..7646c2393 100644
--- a/src/libneochat/neochatroom.h
+++ b/src/libneochat/neochatroom.h
@@ -615,7 +615,7 @@ public:
     /**
      * @brief Whether this user is considered a creator of this room. Only applies to post-v12 rooms.
      */
-    bool isCreator(const QString &userId) const;
+    Q_INVOKABLE bool isCreator(const QString &userId) const;
 
     /**
      * @return The most recent pinned message in the room.