diff --git a/tools/LayoutDump/Program.cs b/tools/LayoutDump/Program.cs
index fe7a2a1b..a30e43a5 100644
--- a/tools/LayoutDump/Program.cs
+++ b/tools/LayoutDump/Program.cs
@@ -8,6 +8,7 @@
 //
 //   dotnet run --project tools/LayoutDump -- 0x21000071
 //   dotnet run --project tools/LayoutDump -- 0x2100002F 0x1000018E --states
+using AcDream.App.UI;
 using AcDream.App.UI.Layout;
 using AcDream.Content;
 using DatReaderWriter;
@@ -42,8 +43,30 @@ if (root is null)
 
 Console.WriteLine($"layout 0x{ids[0]:X8}");
 Print(root, 0);
+
+if (args.Contains("--built"))
+{
+    // What the importer actually PRODUCES, next to what the dat authored.
+    // A difference between the two is the whole question for any "this
+    // control is in the wrong place" report.
+    Console.WriteLine();
+    Console.WriteLine("built widget tree:");
+    ImportedLayout built = LayoutImporter.Build(root, _ => (0u, 0, 0), null, _ => null);
+    PrintBuilt(built.Root, 0);
+}
 return 0;
 
+void PrintBuilt(UiElement e, int depth)
+{
+    string pad = new(' ', depth * 2);
+    Console.WriteLine(
+        $"{pad}{e.GetType().Name,-20} id=0x{e.EventId:X8} "
+        + $"L={e.Left,6:0.#} T={e.Top,6:0.#} W={e.Width,6:0.#} H={e.Height,6:0.#} "
+        + $"vis={e.Visible}");
+    foreach (UiElement child in e.Children)
+        PrintBuilt(child, depth + 1);
+}
+
 void Print(ElementInfo e, int depth)
 {
     string pad = new(' ', depth * 2);