diff --git a/tests/domain/modelling/test_solar_recommendation.py b/tests/domain/modelling/test_solar_recommendation.py
index 43337ab51..05cc1c369 100644
--- a/tests/domain/modelling/test_solar_recommendation.py
+++ b/tests/domain/modelling/test_solar_recommendation.py
@@ -14,7 +14,11 @@ from domain.geospatial.planning_restrictions import PlanningRestrictions
 from domain.modelling.generators.solar_recommendation import recommend_solar
 from domain.modelling.product import Product
 from domain.modelling.recommendation import Recommendation
-from domain.modelling.solar_potential import SolarPotential
+from domain.modelling.solar_potential import (
+    SolarPanelConfiguration,
+    SolarPotential,
+    SolarRoofSegment,
+)
 from repositories.product.product_repository import ProductRepository
 from tests.domain.modelling._elmhurst_recommendation import (
     parse_recommendation_summary,
@@ -242,3 +246,46 @@ def test_infeasible_potential_yields_no_recommendation() -> None:
 
     # Act / Assert
     assert recommend_solar(baseline, _StubProducts(), north_only) is None
+
+
+def test_small_roof_house_gets_sub_ladder_options_instead_of_nothing() -> None:
+    # ADR-0058 end-to-end at the generator seam — the 824/1278 audit's
+    # property-750701 shape: Google max 5 (cap 3.5), ladder starting at 4,
+    # which yielded NO recommendation before Sub-Ladder Configurations.
+
+    # Arrange — an eligible house with a small-roof Solar Potential.
+    baseline = _eligible_house()
+    small_roof = SolarPotential(
+        panel_capacity_watts=400.0,
+        max_array_panels_count=5,
+        configurations=(
+            SolarPanelConfiguration(
+                panels_count=4,
+                yearly_energy_dc_kwh=1278.0,
+                segments=(
+                    SolarRoofSegment(
+                        segment_index=0,
+                        panels_count=4,
+                        azimuth_degrees=180.0,
+                        pitch_degrees=30.0,
+                        yearly_energy_dc_kwh=1278.0,
+                    ),
+                ),
+            ),
+        ),
+    )
+
+    # Act
+    recommendation: Optional[Recommendation] = recommend_solar(
+        baseline, _StubProducts(), small_roof
+    )
+
+    # Assert — rungs 2 and 3 x {no battery, battery} = 4 competing Options,
+    # each overlay's array peak power matching its rung (0.8 / 1.2 kWp).
+    assert recommendation is not None
+    assert len(recommendation.options) == 4
+    peak_powers = sorted(
+        sum(a.peak_power for a in o.overlay.solar.photovoltaic_arrays)
+        for o in recommendation.options
+    )
+    assert peak_powers == [0.8, 0.8, 1.2, 1.2]