diff --git a/domain/scenario_export/scenario_sheet.py b/domain/scenario_export/scenario_sheet.py
index 33871d923..e38116679 100644
--- a/domain/scenario_export/scenario_sheet.py
+++ b/domain/scenario_export/scenario_sheet.py
@@ -53,6 +53,9 @@ _SAVINGS_COLUMNS: tuple[str, ...] = (
     "energy_cost_savings",
 )
 
+# Package-level totals, trailing the savings roll-ups.
+_TOTAL_COLUMNS: tuple[str, ...] = ("total_retrofit_cost",)
+
 
 def _sum(values: Sequence[Optional[float]]) -> float:
     """Sum optional numbers, treating an absent contribution as zero."""
@@ -125,7 +128,9 @@ def shape_scenario_sheet(
     properties: Sequence[PropertyScenarioData],
 ) -> ExportSheet:
     """Shape one Scenario's Properties into a wide export sheet (ADR-0065)."""
-    columns: tuple[str, ...] = _ID_COLUMNS + MEASURE_COLUMNS + _SAVINGS_COLUMNS
+    columns: tuple[str, ...] = (
+        _ID_COLUMNS + MEASURE_COLUMNS + _SAVINGS_COLUMNS + _TOTAL_COLUMNS
+    )
     rows: list[dict[str, Any]] = []
     for prop in properties:
         row: dict[str, Any] = {
@@ -148,5 +153,6 @@ def shape_scenario_sheet(
         row["energy_cost_savings"] = _sum(
             [m.energy_cost_savings for m in prop.measures]
         )
+        row["total_retrofit_cost"] = _sum([m.estimated_cost for m in prop.measures])
         rows.append(row)
     return ExportSheet(columns=columns, rows=tuple(rows))