diff --git a/tests/domain/modelling/test_solar_potential.py b/tests/domain/modelling/test_solar_potential.py
index 5b1ddb54..3c92914d 100644
--- a/tests/domain/modelling/test_solar_potential.py
+++ b/tests/domain/modelling/test_solar_potential.py
@@ -103,6 +103,43 @@ def test_projection_first_config_single_segment() -> None:
     assert segment.sap_pitch_code == 2  # ~32° → 30°
 
 
+def test_projection_reads_panel_dimensions() -> None:
+    # The Dwelling-Roof Cap (ADR-0038) sizes the array by usable roof area, so
+    # it needs each panel's physical footprint — Google reports it at the
+    # solarPotential level.
+    potential = SolarPotential.from_building_insights(_insights())
+
+    assert potential is not None
+    assert potential.panel_height_m is not None
+    assert potential.panel_width_m is not None
+    assert abs(potential.panel_height_m - 1.879) <= 1e-4
+    assert abs(potential.panel_width_m - 1.045) <= 1e-4
+
+
+def test_projection_enriches_segments_with_centre_and_area() -> None:
+    # The Dwelling-Roof Cap (ADR-0038) ranks segments by distance from the
+    # dwelling and bounds the array by usable roof area, so each segment must
+    # carry its centre + area — sourced from the top-level roofSegmentStats,
+    # keyed by segmentIndex (the per-config roofSegmentSummaries omit them).
+    insights = _insights()
+    stats_by_index = {
+        int(s["segmentIndex"]): s
+        for s in insights["solarPotential"]["roofSegmentStats"]
+    }
+
+    potential = SolarPotential.from_building_insights(insights)
+
+    assert potential is not None
+    segment = potential.configurations[0].segments[0]  # segment_index == 1
+    expected = stats_by_index[segment.segment_index]
+    assert segment.area_m2 is not None
+    assert abs(segment.area_m2 - expected["stats"]["areaMeters2"]) <= 1e-4
+    assert segment.center_latitude is not None
+    assert segment.center_longitude is not None
+    assert abs(segment.center_latitude - expected["center"]["latitude"]) <= 1e-9
+    assert abs(segment.center_longitude - expected["center"]["longitude"]) <= 1e-9
+
+
 def test_projection_largest_config_spans_all_segments() -> None:
     # Arrange
     insights = _insights()