diff --git a/tests/domain/epc/test_roof_type.py b/tests/domain/epc/test_roof_type.py
new file mode 100644
index 000000000..0b0eacbfb
--- /dev/null
+++ b/tests/domain/epc/test_roof_type.py
@@ -0,0 +1,46 @@
+"""Contract tests for the `RoofType` Landlord-Override taxonomy.
+
+The `Pitched, sloping ceiling, …` family is lock-step with the app-side
+`RoofTypeValues` enum + Drizzle migration 0278 (assessment-model#449, ADR-0002 /
+ADR-0066): the string values here are the shared contract and must match
+byte-for-byte. The classifier resolves a reply value to a member via
+`RoofType(value)` (`ChatGptColumnClassifier._to_category`), so "is this a
+recognised roof type" is exactly the `RoofType(value)` construction below.
+"""
+
+from __future__ import annotations
+
+import pytest
+
+from domain.epc.property_overrides.roof_type import RoofType
+
+# The pitched-sloping-ceiling family, byte-for-byte with assessment-model#449.
+_SLOPING_CEILING_VALUES: list[str] = [
+    "Pitched, sloping ceiling, as built",
+    "Pitched, sloping ceiling, 12 mm insulation",
+    "Pitched, sloping ceiling, 25 mm insulation",
+    "Pitched, sloping ceiling, 50 mm insulation",
+    "Pitched, sloping ceiling, 75 mm insulation",
+    "Pitched, sloping ceiling, 100 mm insulation",
+    "Pitched, sloping ceiling, 125 mm insulation",
+    "Pitched, sloping ceiling, 150 mm insulation",
+    "Pitched, sloping ceiling, 175 mm insulation",
+    "Pitched, sloping ceiling, 200 mm insulation",
+    "Pitched, sloping ceiling, 225 mm insulation",
+    "Pitched, sloping ceiling, 250 mm insulation",
+    "Pitched, sloping ceiling, 270 mm insulation",
+    "Pitched, sloping ceiling, 300 mm insulation",
+    "Pitched, sloping ceiling, 350 mm insulation",
+    "Pitched, sloping ceiling, 400 mm insulation",
+    "Pitched, sloping ceiling, 400+ mm insulation",
+]
+
+
+@pytest.mark.parametrize("value", _SLOPING_CEILING_VALUES)
+def test_pitched_sloping_ceiling_string_is_a_recognised_roof_type(value: str) -> None:
+    # Act — the classifier resolves a canonical string through the enum
+    # constructor; a missing member raises ValueError (falls to UNKNOWN).
+    member = RoofType(value)
+
+    # Assert — the canonical string round-trips as its own member value.
+    assert member.value == value