diff --git a/hub/exports/building_energy/idf.py b/hub/exports/building_energy/idf.py
index cf1646e3..514f6ae4 100644
--- a/hub/exports/building_energy/idf.py
+++ b/hub/exports/building_energy/idf.py
@@ -513,11 +513,11 @@ class Idf:
     self._lod = self._city.level_of_detail.geometry
     for building in self._city.buildings:
       for internal_zone in building.internal_zones:
-        if internal_zone.thermal_zones_from_internal_zones is None:
+        if internal_zone.thermal_zones_from_internal_zones is None or len(thermal_zone.thermal_boundaries) == 0:
+          self._add_shading(building)  # if the building has not archetype use it as shadow object
           continue
         for thermal_zone in internal_zone.thermal_zones_from_internal_zones:
           for thermal_boundary in thermal_zone.thermal_boundaries:
-
             self._add_construction(thermal_boundary)
             if thermal_boundary.parent_surface.vegetation is not None:
               self._add_vegetation_material(thermal_boundary.parent_surface.vegetation)