diff --git a/domain/modelling/contingencies.py b/domain/modelling/contingencies.py
index a184534d..37af47e6 100644
--- a/domain/modelling/contingencies.py
+++ b/domain/modelling/contingencies.py
@@ -8,6 +8,8 @@ extended as each measure type lands.
 _CONTINGENCY_RATES: dict[str, float] = {
     "cavity_wall_insulation": 0.10,
     "loft_insulation": 0.10,
+    "sloping_ceiling_insulation": 0.10,
+    "flat_roof_insulation": 0.10,
     "suspended_floor_insulation": 0.20,
     "solid_floor_insulation": 0.26,
     "mechanical_ventilation": 0.26,
diff --git a/harness/sample_catalogue.json b/harness/sample_catalogue.json
index 4d2851a2..e3ae97ec 100644
--- a/harness/sample_catalogue.json
+++ b/harness/sample_catalogue.json
@@ -1,6 +1,8 @@
 {
   "cavity_wall_insulation": { "unit_cost_per_m2": 18.5 },
   "loft_insulation": { "unit_cost_per_m2": 12.0 },
+  "sloping_ceiling_insulation": { "unit_cost_per_m2": 40.0 },
+  "flat_roof_insulation": { "unit_cost_per_m2": 60.0 },
   "suspended_floor_insulation": { "unit_cost_per_m2": 25.0 },
   "solid_floor_insulation": { "unit_cost_per_m2": 45.0 },
   "mechanical_ventilation": { "unit_cost_per_m2": 450.0 },
diff --git a/tests/harness/test_console.py b/tests/harness/test_console.py
index cd3ad9af..4ef5059c 100644
--- a/tests/harness/test_console.py
+++ b/tests/harness/test_console.py
@@ -9,6 +9,7 @@ import pytest
 from datatypes.epc.domain.epc import Epc
 from datatypes.epc.domain.epc_property_data import EpcPropertyData
 from domain.geospatial.planning_restrictions import PlanningRestrictions
+from domain.modelling.contingencies import contingency_rate
 from harness.console import DEFAULT_CATALOGUE, run_modelling, run_one
 from repositories.product.product_json_repository import ProductJsonRepository
 from tests.domain.modelling._elmhurst_recommendation import (
@@ -25,6 +26,8 @@ _GENERATOR_MEASURE_TYPES = (
     "external_wall_insulation",
     "internal_wall_insulation",
     "loft_insulation",
+    "sloping_ceiling_insulation",
+    "flat_roof_insulation",
     "suspended_floor_insulation",
     "solid_floor_insulation",
     "mechanical_ventilation",
@@ -113,10 +116,12 @@ def test_sample_catalogue_prices_every_generator_measure_type() -> None:
     # Arrange — the default offline catalogue.
     products: ProductJsonRepository = ProductJsonRepository(DEFAULT_CATALOGUE)
 
-    # Act / Assert — get() raises if a Measure Type is unpriced, so an offline
-    # run over arbitrary EPCs never dies on a missing catalogue entry.
+    # Act / Assert — get() and contingency_rate() each raise on a missing
+    # Measure Type, so an offline run over arbitrary EPCs never dies on a
+    # missing catalogue or contingency entry.
     for measure_type in _GENERATOR_MEASURE_TYPES:
         products.get(measure_type)
+        contingency_rate(measure_type)
 
 
 def test_run_one_threads_a_current_market_value_onto_the_plan() -> None: