diff --git a/orchestration/sharepoint_renamer_orchestrator.py b/orchestration/sharepoint_renamer_orchestrator.py
index 42b0e803c..15917f0a2 100644
--- a/orchestration/sharepoint_renamer_orchestrator.py
+++ b/orchestration/sharepoint_renamer_orchestrator.py
@@ -11,6 +11,7 @@ BASE_PATH = (
     "Sero Project Documents/Property Folders"
 )
 ASSESSMENT_SUBFOLDER = "A. Assessment"
+BATCH_FOLDER_PREFIX = "_Sero Batch"
 
 logger = setup_logger()
 
@@ -65,6 +66,9 @@ class SharepointRenamerOrchestrator:
         self._csv_path = csv_path
         self._dry_run = dry_run
 
+    def _discover_roots(self) -> list[str]:
+        raise NotImplementedError
+
     def run(self) -> None:
         with open(self._csv_path, newline="", encoding="utf-8-sig") as f:
             reader = csv.DictReader(f)
diff --git a/tests/scripts/test_rename_sharepoint_files.py b/tests/scripts/test_rename_sharepoint_files.py
index 5affea7e2..35c4edc3e 100644
--- a/tests/scripts/test_rename_sharepoint_files.py
+++ b/tests/scripts/test_rename_sharepoint_files.py
@@ -4,6 +4,7 @@ from unittest.mock import MagicMock
 import pytest
 
 from orchestration.sharepoint_renamer_orchestrator import (
+    BASE_PATH,
     SharepointRenamerOrchestrator,
     build_canonical_filename,
 )
@@ -47,6 +48,35 @@ def test_no_prefix_still_canonical() -> None:
     assert result == "100_1 High St AB1 2CD_Survey.pdf"
 
 
+# ---------------------------------------------------------------------------
+# _discover_roots — batch subfolders become extra roots
+# ---------------------------------------------------------------------------
+
+
+def test_discover_roots_includes_sero_batch_folders() -> None:
+    # Arrange
+    sp = MagicMock()
+    sp.get_folders_in_path.return_value = {
+        "value": [
+            _make_folder("1 High St, AB1 2CD"),
+            _make_folder("_Sero Batch 3"),
+            _make_folder("_Sero Batch 2"),
+            _make_file("stray.pdf"),
+        ]
+    }
+
+    # Act
+    roots = _make_orchestrator(sp)._discover_roots()
+
+    # Assert
+    assert roots == [
+        BASE_PATH,
+        f"{BASE_PATH}/_Sero Batch 2",
+        f"{BASE_PATH}/_Sero Batch 3",
+    ]
+    sp.get_folders_in_path.assert_called_once_with(BASE_PATH)
+
+
 # ---------------------------------------------------------------------------
 # _process_folder — files only at root level
 # ---------------------------------------------------------------------------