diff --git a/tests/domain/scenario_export/test_scenario_sheet.py b/tests/domain/scenario_export/test_scenario_sheet.py
index eaa2190ce..e21e633a2 100644
--- a/tests/domain/scenario_export/test_scenario_sheet.py
+++ b/tests/domain/scenario_export/test_scenario_sheet.py
@@ -126,3 +126,19 @@ def test_savings_and_sap_points_are_summed_across_a_propertys_measures() -> None
     assert row["co2_equivalent_savings"] == pytest.approx(1.5)
     assert row["kwh_savings"] == 3400.0
     assert row["energy_cost_savings"] == 420.0
+
+
+def test_total_retrofit_cost_sums_the_per_measure_costs() -> None:
+    # arrange — a Property with two priced measures.
+    prop = _property(
+        measures=[
+            _measure(measure_type="loft_insulation", estimated_cost=1200.0),
+            _measure(measure_type="cavity_wall_insulation", estimated_cost=800.0),
+        ]
+    )
+
+    # act
+    sheet = shape_scenario_sheet([prop])
+
+    # assert — the package total is the sum of the measure costs.
+    assert sheet.rows[0]["total_retrofit_cost"] == 2000.0