diff --git a/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000490.py b/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000490.py
index 05313170..98b86231 100644
--- a/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000490.py
+++ b/packages/domain/src/domain/sap/worksheet/tests/_elmhurst_worksheet_000490.py
@@ -30,6 +30,8 @@ from datatypes.epc.domain.epc_property_data import (
     SapFloorDimension,
     SapVentilation,
     SapWindow,
+    ShowerOutlet,
+    ShowerOutlets,
 )
 from domain.ml.tests._fixtures import (
     make_main_heating_detail,
@@ -51,13 +53,23 @@ _WC_CAVITY = 4
 
 
 def build_epc() -> EpcPropertyData:
-    """EpcPropertyData mirroring the Elmhurst 000490 inputs."""
+    """EpcPropertyData mirroring the Elmhurst 000490 inputs.
+
+    Field-level parity with `from_elmhurst_site_notes(Summary_000490.
+    pdf)` for the load-bearing field allow-list — cascade-equivalent
+    encoding-only fields (descriptive floor/roof strings, ventilation
+    zero counts) are populated explicitly to eliminate noise without
+    altering the SAP cascade output (the 11 1e-4 pins in
+    `test_e2e_elmhurst_sap_score.py` remain GREEN against the worksheet
+    PDF's `SAP value 57.3979`).
+    """
     main = SapBuildingPart(
         identifier=BuildingPartIdentifier.MAIN,
         construction_age_band="B",
         wall_construction=_WC_CAVITY,
         wall_insulation_type=4,
-        wall_thickness_measured=False,
+        # Summary §7 lodges Wall Thickness 400 mm explicitly; matches mapper.
+        wall_thickness_measured=True,
         party_wall_construction=0,  # "U Unable to determine" → U=0.25
         roof_insulation_thickness=300,  # Table 16 "300 mm joists" → U=0.14
         sap_floor_dimensions=[
@@ -75,13 +87,20 @@ def build_epc() -> EpcPropertyData:
             ),
         ],
         wall_thickness_mm=400,
+        # Mapper-extracted descriptive fields (cascade reads int codes
+        # on SapFloorDimension; these carry the lodged Summary text).
+        floor_type="Ground floor",
+        floor_construction_type="Suspended timber",
+        floor_insulation_type_str="As built",
+        floor_u_value_known=False,
+        roof_insulation_location="Joists",
     )
     extension = SapBuildingPart(
         identifier=BuildingPartIdentifier.EXTENSION_1,
         construction_age_band="B",
         wall_construction=_WC_CAVITY,
         wall_insulation_type=4,
-        wall_thickness_measured=False,
+        wall_thickness_measured=True,
         party_wall_construction=0,
         roof_insulation_thickness=300,
         sap_floor_dimensions=[
@@ -104,6 +123,11 @@ def build_epc() -> EpcPropertyData:
             ),
         ],
         wall_thickness_mm=400,
+        floor_type="Above unheated space",
+        floor_construction_type="Suspended timber",
+        floor_insulation_type_str="As built",
+        floor_u_value_known=False,
+        roof_insulation_location="Joists",
     )
     # door_count=2 matches the worksheet's 3.70 m² of total door area:
     # Elmhurst lodges 1 oversized 3.7 m × 1.0 m door, our cascade uses the
@@ -113,7 +137,7 @@ def build_epc() -> EpcPropertyData:
     # 28kW, 2004-2012, winter eff 88.2%, summer eff 79.6%). Lodging it on the
     # MainHeatingDetail routes `cert_to_inputs` into the PCDB precedence
     # cascade rather than the Table 4a category-2 default (80%).
-    return make_minimal_sap10_epc(
+    epc = make_minimal_sap10_epc(
         total_floor_area_m2=66.06,
         country_code="ENG",
         postcode="bd19 3TF",
@@ -124,6 +148,11 @@ def build_epc() -> EpcPropertyData:
         low_energy_fixed_lighting_bulbs_count=8,
         sap_windows=list(SECTION_6_VERTICAL_WINDOWS),
         percent_draughtproofed=100,
+        extensions_count=1,
+        blocked_chimneys_count=0,
+        dwelling_type="End-Terrace house",
+        built_form="End-Terrace",
+        property_type="House",
         sap_ventilation=SapVentilation(
             extract_fans_count=2,
             sheltered_sides=1,
@@ -131,6 +160,14 @@ def build_epc() -> EpcPropertyData:
             # the worksheet, same pattern as 000480.
             has_suspended_timber_floor=False,
             has_draught_lobby=False,
+            open_flues_count=0,
+            closed_flues_count=0,
+            boiler_flues_count=0,
+            other_flues_count=0,
+            passive_vents_count=0,
+            flueless_gas_fires_count=0,
+            draught_lobby=True,
+            pressure_test="Not available",
         ),
         sap_heating=make_sap_heating(
             main_heating_details=[
@@ -140,8 +177,21 @@ def build_epc() -> EpcPropertyData:
                 ),
             ],
             secondary_heating_type=691,
+            # 000490 cert: number_baths=1 (mapper extracts this). Cascade-
+            # equivalent to leaving None — Appendix J §1a defaults to 1
+            # when nothing is lodged.
+            number_baths=1,
         ),
     )
+    # Top-level cert-lodgement booleans the mapper surfaces.
+    epc.has_conservatory = False
+    epc.any_unheated_rooms = False
+    epc.number_of_storeys = 2
+    epc.sap_heating.shower_outlets = ShowerOutlets(
+        shower_outlet=ShowerOutlet(shower_outlet_type="Non-electric shower"),
+    )
+    epc.sap_heating.main_heating_details[0].central_heating_pump_age_str = "Unknown"
+    return epc
 
 
 # ============================================================================