diff --git a/Neos.Neos/Configuration/NodeTypes.Sites.yaml b/Neos.Neos/Configuration/NodeTypes.Sites.yaml
deleted file mode 100644
index fa2556e5904..00000000000
--- a/Neos.Neos/Configuration/NodeTypes.Sites.yaml
+++ /dev/null
@@ -1,3 +0,0 @@
-'Neos.Neos:Sites':
-  superTypes:
-    'Neos.ContentRepository:Root': true
diff --git a/Neos.Neos/NodeTypes/Mixin/Document.yaml b/Neos.Neos/NodeTypes/Mixin/Document.yaml
index 41d37e48cea..f00b1f0dd85 100644
--- a/Neos.Neos/NodeTypes/Mixin/Document.yaml
+++ b/Neos.Neos/NodeTypes/Mixin/Document.yaml
@@ -11,6 +11,8 @@
   constraints:
     nodeTypes:
       '*': false
+      # explicitly disallow to create a homepage below a regular document
+      'Neos.Neos:Site': false
       'Neos.Neos:Document': true
   postprocessors:
     'CreationDialogPostprocessor':
diff --git a/Neos.Neos/NodeTypes/Mixin/Site.yaml b/Neos.Neos/NodeTypes/Mixin/Site.yaml
new file mode 100644
index 00000000000..c2d38ef77a3
--- /dev/null
+++ b/Neos.Neos/NodeTypes/Mixin/Site.yaml
@@ -0,0 +1,10 @@
+#
+# Abstract NodeType for a Neos.Neos site.
+# Each homepage must extend this NodeType.
+# Nodes of this type must be direct children of the Neos.Neos:Site Root
+# and must not be created at any other place in the tree.
+#
+'Neos.Neos:Site':
+  abstract: true
+  superTypes:
+    'Neos.Neos:Document': true
diff --git a/Neos.Neos/NodeTypes/Mixin/Sites.yaml b/Neos.Neos/NodeTypes/Mixin/Sites.yaml
new file mode 100644
index 00000000000..229957b03dd
--- /dev/null
+++ b/Neos.Neos/NodeTypes/Mixin/Sites.yaml
@@ -0,0 +1,11 @@
+#
+# Root NodeType for a Neos.Neos content repository.
+# Any Neos Site node must be its direct child.
+#
+'Neos.Neos:Sites':
+  superTypes:
+    'Neos.ContentRepository:Root': true
+  constraints:
+    nodeTypes:
+      '*': false
+      'Neos.Neos:Site': true