diff --git a/layers.cpp b/layers.cpp
index 21bd4399e8..cb95b3a783 100644
--- a/layers.cpp
+++ b/layers.cpp
@@ -38,10 +38,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  as those are very special, and are stored in Workspace::desktops), in the order
  the clients were created.
 
- Every window has one layer assigned in which it is. There are 6 layers,
- from bottom : DesktopLayer, BelowLayer, NormalLayer, DockLayer, AboveLayer
+ Every window has one layer assigned in which it is. There are 7 layers,
+ from bottom : DesktopLayer, BelowLayer, NormalLayer, DockLayer, AboveLayer, NotificationLayer
  and ActiveLayer (see also NETWM sect.7.10.). The layer a window is in depends
- on the window type, and on other things like whether the window is active.
+ on the window type, and on other things like whether the window is active. We extend the layers
+ provided in NETWM by the NotificationLayer, which contains notification windows. Those are kept
+ above all windows except the active fullscreen window.
 
  NET::Splash clients belong to the Normal layer. NET::TopMenu clients
  belong to Dock layer. Clients that are both NET::Dock and NET::KeepBelow
@@ -515,7 +517,7 @@ ToplevelList Workspace::constrainedStackingOrder()
             // If a window is raised above some other window in the same window group
             // which is in the ActiveLayer (i.e. it's fulscreened), make sure it stays
             // above that window (see #95731).
-            if (*mLayer == ActiveLayer && (l == NormalLayer || l == AboveLayer))
+            if (*mLayer == ActiveLayer && (l > BelowLayer))
                 l = ActiveLayer;
             *mLayer = l;
         } else if (c) {
@@ -831,6 +833,8 @@ Layer Client::belongsToLayer() const
             return AboveLayer;
         return DockLayer;
     }
+    if (isNotification())
+        return NotificationLayer;
     if (keepBelow())
         return BelowLayer;
     if (isActiveFullScreen())
diff --git a/utils.h b/utils.h
index 4348b98bd4..a2d404277a 100644
--- a/utils.h
+++ b/utils.h
@@ -44,7 +44,7 @@ namespace KWin
 // window types that are supported as normal windows (i.e. KWin actually manages them)
 const int SUPPORTED_MANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
         | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
-        | NET::UtilityMask | NET::SplashMask;
+        | NET::UtilityMask | NET::SplashMask | NET::NotificationMask;
 // window types that are supported as unmanaged (mainly for compositing)
 const int SUPPORTED_UNMANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
         | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
@@ -89,6 +89,7 @@ enum Layer {
     NormalLayer,
     DockLayer,
     AboveLayer,
+    NotificationLayer, // layer for windows of type notification
     ActiveLayer, // active fullscreen, or active dialog
     UnmanagedLayer, // layer for override redirect windows.
     NumLayers // number of layers, must be last