diff --git a/orchestration/modelling_orchestrator.py b/orchestration/modelling_orchestrator.py
index c1a9ea44..df2c83ae 100644
--- a/orchestration/modelling_orchestrator.py
+++ b/orchestration/modelling_orchestrator.py
@@ -249,24 +249,86 @@ def _candidate_recommendations(
     solar_potential: Optional[SolarPotential],
     considered_measures: Optional[frozenset[MeasureType]],
 ) -> list[Recommendation]:
-    """Run every Recommendation Generator; keep the ones that apply. Solid-wall
-    insulation, glazing, heating and solar are additionally gated by the
-    Property's planning protections (ADR-0019 / ADR-0022 / ADR-0024 / ADR-0026);
-    solar also needs the Property's Google solar potential. ``considered_measures``
-    then restricts the survivors to the run's allowlist (None = all)."""
-    found = (
-        recommend_cavity_wall(effective_epc, products),
-        recommend_solid_wall(effective_epc, products, planning_restrictions),
-        recommend_roof_insulation(effective_epc, products),
-        recommend_floor_insulation(effective_epc, products),
-        recommend_glazing(effective_epc, products, planning_restrictions),
-        recommend_lighting(effective_epc, products),
-        recommend_heating(effective_epc, products, planning_restrictions),
-        recommend_secondary_heating_removal(effective_epc, products),
-        recommend_solar(
-            effective_epc, products, solar_potential, planning_restrictions
+    """Run the applicable Recommendation Generators; keep the ones that apply.
+    Solid-wall insulation, glazing, heating and solar are additionally gated by
+    the Property's planning protections (ADR-0019 / ADR-0022 / ADR-0024 /
+    ADR-0026); solar also needs the Property's Google solar potential.
+
+    ``considered_measures`` gates generation *up front*: a generator runs only
+    when the allowlist admits at least one of the measure types it can emit
+    (None = every measure), so an excluded measure never reaches the catalogue —
+    which matters when the live ``material.type`` enum cannot even represent it
+    (e.g. ``secondary_heating_removal``). ``restrict_to_considered_measures``
+    then trims any disallowed Options off the multi-Option survivors."""
+
+    def admitted(*emits: MeasureType) -> bool:
+        return considered_measures is None or any(
+            measure in considered_measures for measure in emits
+        )
+
+    # Each generator paired with the measure types it can emit, so the allowlist
+    # can skip a generator whose every type is excluded before it is invoked.
+    generators: tuple[
+        tuple[bool, Callable[[], Optional[Recommendation]]], ...
+    ] = (
+        (
+            admitted(MeasureType.CAVITY_WALL_INSULATION),
+            lambda: recommend_cavity_wall(effective_epc, products),
+        ),
+        (
+            admitted(
+                MeasureType.INTERNAL_WALL_INSULATION,
+                MeasureType.EXTERNAL_WALL_INSULATION,
+            ),
+            lambda: recommend_solid_wall(
+                effective_epc, products, planning_restrictions
+            ),
+        ),
+        (
+            admitted(
+                MeasureType.LOFT_INSULATION,
+                MeasureType.SLOPING_CEILING_INSULATION,
+                MeasureType.FLAT_ROOF_INSULATION,
+            ),
+            lambda: recommend_roof_insulation(effective_epc, products),
+        ),
+        (
+            admitted(
+                MeasureType.SUSPENDED_FLOOR_INSULATION,
+                MeasureType.SOLID_FLOOR_INSULATION,
+            ),
+            lambda: recommend_floor_insulation(effective_epc, products),
+        ),
+        (
+            admitted(MeasureType.DOUBLE_GLAZING, MeasureType.SECONDARY_GLAZING),
+            lambda: recommend_glazing(effective_epc, products, planning_restrictions),
+        ),
+        (
+            admitted(MeasureType.LOW_ENERGY_LIGHTING),
+            lambda: recommend_lighting(effective_epc, products),
+        ),
+        (
+            admitted(
+                MeasureType.HIGH_HEAT_RETENTION_STORAGE_HEATERS,
+                MeasureType.AIR_SOURCE_HEAT_PUMP,
+                MeasureType.GAS_BOILER_UPGRADE,
+                MeasureType.SYSTEM_TUNE_UP,
+                MeasureType.SYSTEM_TUNE_UP_ZONED,
+            ),
+            lambda: recommend_heating(effective_epc, products, planning_restrictions),
+        ),
+        (
+            admitted(MeasureType.SECONDARY_HEATING_REMOVAL),
+            lambda: recommend_secondary_heating_removal(effective_epc, products),
+        ),
+        (
+            admitted(MeasureType.SOLAR_PV),
+            lambda: recommend_solar(
+                effective_epc, products, solar_potential, planning_restrictions
+            ),
         ),
     )
+    found = [thunk() for is_admitted, thunk in generators if is_admitted]
     applicable = [
         recommendation for recommendation in found if recommendation is not None
     ]
diff --git a/scripts/run_modelling_e2e.py b/scripts/run_modelling_e2e.py
index 6ca59c76..1b900ed5 100644
--- a/scripts/run_modelling_e2e.py
+++ b/scripts/run_modelling_e2e.py
@@ -191,6 +191,21 @@ def _parse_measures(raw: Optional[str]) -> Optional[frozenset[MeasureType]]:
     )
 
 
+def _resolve_considered(
+    allowlist: Optional[frozenset[MeasureType]],
+    excluded: Optional[frozenset[MeasureType]],
+) -> Optional[frozenset[MeasureType]]:
+    """Combine the `--measures` allowlist with the `--exclude-measures` set. With
+    no exclusions the allowlist is returned unchanged (None = every measure).
+    With exclusions the result is (the allowlist, or every measure) minus the
+    excluded types — so `--exclude-measures secondary_heating_removal` considers
+    every measure except that one, without enumerating the rest."""
+    if not excluded:
+        return allowlist
+    base = allowlist if allowlist is not None else frozenset(MeasureType)
+    return base - excluded
+
+
 def _context_summary(
     spatial: Optional[SpatialReference], solar_insights: Optional[dict[str, Any]]
 ) -> str:
@@ -277,6 +292,12 @@ def main() -> None:
         default=None,
         help="comma-separated measure types to consider (default: all)",
     )
+    parser.add_argument(
+        "--exclude-measures",
+        default=None,
+        help="comma-separated measure types to exclude (default: none) — e.g. "
+        "secondary_heating_removal, which the live catalogue does not yet stock",
+    )
     parser.add_argument(
         "--portfolio-id",
         type=int,
@@ -307,7 +328,9 @@ def main() -> None:
     geospatial = GeospatialS3Repository(_s3_parquet_reader(os.environ["DATA_BUCKET"]))
     solar_client = GoogleSolarApiClient(os.environ["GOOGLE_SOLAR_API_KEY"])
     engine = _engine()
-    considered = _parse_measures(args.measures)
+    considered = _resolve_considered(
+        _parse_measures(args.measures), _parse_measures(args.exclude_measures)
+    )
     uprns = _uprns_for(engine, args.property_ids)
     # One read-only session for the live `material` catalogue, reused across the
     # batch so both store and no-store runs price against the same DB rows.
diff --git a/tests/orchestration/test_modelling_solar_threading.py b/tests/orchestration/test_modelling_solar_threading.py
index 68884d27..988f4229 100644
--- a/tests/orchestration/test_modelling_solar_threading.py
+++ b/tests/orchestration/test_modelling_solar_threading.py
@@ -116,6 +116,53 @@ def test_candidate_recommendations_excludes_solar_without_potential() -> None:
     assert "Solar PV" not in {r.surface for r in recommendations}
 
 
+class _ProductsRaisingFor(ProductRepository):
+    """A catalogue that raises for one measure type — mirroring the live DB,
+    whose ``material.type`` enum does not carry ``secondary_heating_removal``.
+    Invoking that measure's generator would raise, so this proves an excluded
+    generator is never run."""
+
+    def __init__(self, forbidden: MeasureType) -> None:
+        self._forbidden = forbidden
+
+    def get(self, measure_type: str) -> Product:
+        if measure_type == self._forbidden:
+            raise ValueError(f"catalogue cannot represent {measure_type!r}")
+        return Product(
+            measure_type=measure_type,
+            unit_cost_per_m2=0.0,
+            contingency_rate=0.15,
+            id=909,
+        )
+
+
+def test_an_excluded_measures_generator_is_not_invoked() -> None:
+    # Arrange — a dwelling with a lodged secondary heating system (so the
+    # secondary-heating generator is eligible to fire) priced against a catalogue
+    # that raises for that type, exactly as the live `material.type` enum does.
+    epc = _eligible_house()
+    epc.sap_heating.secondary_heating_type = 631
+    allowlist = frozenset(MeasureType) - {MeasureType.SECONDARY_HEATING_REMOVAL}
+
+    # Act — excluding the measure must stop its generator running at all (it would
+    # otherwise query the catalogue and raise).
+    recommendations = _candidate_recommendations(
+        epc,
+        _ProductsRaisingFor(MeasureType.SECONDARY_HEATING_REMOVAL),
+        PlanningRestrictions(),
+        None,
+        allowlist,
+    )
+
+    # Assert — the run completes and no secondary-heating option leaks through.
+    option_types = {
+        option.measure_type
+        for recommendation in recommendations
+        for option in recommendation.options
+    }
+    assert MeasureType.SECONDARY_HEATING_REMOVAL not in option_types
+
+
 def test_considered_measures_restricts_candidates_to_the_allowlist() -> None:
     # Arrange — a solar-eligible house, with its solar potential present, so the
     # unrestricted run offers Solar PV alongside any fabric/heating candidates.