diff --git a/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000474.py b/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000474.py
index 1b9ef77b..6e953323 100644
--- a/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000474.py
+++ b/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000474.py
@@ -28,6 +28,8 @@ from datatypes.epc.domain.epc_property_data import (
     SapFloorDimension,
     SapVentilation,
     SapWindow,
+    ShowerOutlet,
+    ShowerOutlets,
 )
 from domain.ml.tests._fixtures import (
     make_main_heating_detail,
@@ -195,6 +197,12 @@ def build_epc() -> EpcPropertyData:
                     main_heating_data_source=1,
                 ),
             ],
+            # Summary §15 / §16 lodgement the mapper surfaces — adding
+            # for field-level parity with `from_elmhurst_site_notes`.
+            # Cascade-equivalent: number_baths=1 is exactly what Appendix
+            # J §1a defaults to when nothing is lodged, so the 1e-4
+            # cascade pin is preserved.
+            number_baths=1,
         ),
     )
     # Top-level cert-lodgement booleans / counts the Elmhurst mapper
@@ -205,6 +213,14 @@ def build_epc() -> EpcPropertyData:
     epc.number_of_storeys = 2
     epc.hydro = False
     epc.photovoltaic_array = False
+    # `make_sap_heating` doesn't expose `shower_outlets` as a kwarg; the
+    # Elmhurst mapper surfaces it from Summary §16. Setting here for
+    # cross-mapper field parity. Cascade-equivalent: a non-electric
+    # mixer outlet with no WWHRS is Appendix J's default when the cert
+    # lodges a bath without explicit shower data.
+    epc.sap_heating.shower_outlets = ShowerOutlets(
+        shower_outlet=ShowerOutlet(shower_outlet_type="Non-electric shower"),
+    )
     return epc