diff --git a/backend/magic_plan/tests/test_audit_script.py b/backend/magic_plan/tests/test_audit_script.py
index 5bf14596..8e966561 100644
--- a/backend/magic_plan/tests/test_audit_script.py
+++ b/backend/magic_plan/tests/test_audit_script.py
@@ -1,5 +1,6 @@
+import openpyxl
 from datatypes.magicplan.domain.models import Door, Floor, Plan, Room, Window
-from backend.magic_plan.audit_script import AuditRow, _build_rows
+from backend.magic_plan.audit_script import AuditRow, _build_rows, _write_headers
 
 
 def test_build_rows_opening_and_trickle_vent_fields_are_none() -> None:
@@ -233,3 +234,29 @@ def test_build_rows_room_name_in_location_on_every_row() -> None:
     for row in data_rows:
         assert row.window_location == "Kitchen"
         assert row.door_location == "Kitchen"
+
+
+def test_write_headers_two_rows_correct_labels_and_column_positions() -> None:
+    # Arrange
+    wb = openpyxl.Workbook()
+    ws = wb.active  # type: ignore[assignment]
+
+    # Act
+    _write_headers(ws)
+
+    # Assert — group labels in row 1 at the new column positions
+    assert ws.cell(row=1, column=1).value == "Room"
+    assert ws.cell(row=1, column=6).value == "Window Area"
+    assert ws.cell(row=1, column=12).value == "Openings"
+    assert ws.cell(row=1, column=16).value == "Trickle Vents"
+    assert ws.cell(row=1, column=22).value == "Doors"
+    # Assert — "Door Undercuts" label no longer used
+    assert ws.cell(row=1, column=28).value is None
+    # Assert — only two header rows; row 3 is empty
+    assert ws.cell(row=3, column=1).value is None
+    assert ws.cell(row=3, column=13).value is None
+    # Assert — opening columns use self-describing labels (no "Opening 1" sub-header)
+    assert ws.cell(row=2, column=12).value == "No. of Openings"
+    assert ws.cell(row=2, column=13).value == "Opening Width m"
+    assert ws.cell(row=2, column=14).value == "Opening Height m"
+    assert ws.cell(row=2, column=15).value == "Total Area m²"