diff --git a/src/bonsai/bonsai/bim/module/geometry/operator.py b/src/bonsai/bonsai/bim/module/geometry/operator.py
index cb50494ee0..18bd2b7beb 100644
--- a/src/bonsai/bonsai/bim/module/geometry/operator.py
+++ b/src/bonsai/bonsai/bim/module/geometry/operator.py
@@ -3073,14 +3073,10 @@ class AddHalfSpaceSolidItem(bpy.types.Operator, tool.Ifc.Operator):
         obj.matrix_world = matrix
         tool.Geometry.record_object_position(obj)
 
-        ifc_file = tool.Ifc.get()
-        unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
-        local_z = ifc_file.createIfcDirection((0.0, 0.0, 1.0))
-        local_x = ifc_file.createIfcDirection((1.0, 0.0, 0.0))
-        point = ifc_file.createIfcCartesianPoint((np.array(local_matrix.translation) / unit_scale).tolist())
-        placement = ifc_file.createIfcAxis2Placement3D(point, local_z, local_x)
-        plane = ifc_file.createIfcPlane(placement)
-        item = ifc_file.createIfcHalfSpaceSolid(plane, AgreementFlag=False)
+        unit_scale = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+        builder = ifcopenshell.util.shape_builder.ShapeBuilder(tool.Ifc.get())
+        location = np.array(local_matrix.translation) / unit_scale
+        item = builder.half_space_solid(builder.plane(location=location))
         props.add_item_object(obj, item)
 
         representation = tool.Geometry.get_active_representation(props.representation_obj)
diff --git a/src/bonsai/bonsai/tool/geometry.py b/src/bonsai/bonsai/tool/geometry.py
index a07e4b203c..133189b184 100644
--- a/src/bonsai/bonsai/tool/geometry.py
+++ b/src/bonsai/bonsai/tool/geometry.py
@@ -1636,11 +1636,11 @@ class Geometry(bonsai.core.tool.Geometry):
             if not (obj := item_obj.obj) or not tool.Ifc.is_moved(obj):
                 continue
             item = tool.Ifc.get().by_id(obj.data.BIMMeshProperties.ifc_definition_id)
-            if is_swept_area := item.is_a("IfcSweptAreaSolid"):
+            if item.is_a("IfcSweptAreaSolid"):
                 has_changed = True
                 old_position = item.Position
 
-                if is_swept_area and np.allclose(np.array(rep_matrix), np.array(obj.matrix_world), atol=1e-4):
+                if np.allclose(np.array(rep_matrix), np.array(obj.matrix_world), atol=1e-4):
                     if old_position:
                         item.Position = None
                         ifcopenshell.util.element.remove_deep2(tool.Ifc.get(), old_position)
@@ -1651,7 +1651,7 @@ class Geometry(bonsai.core.tool.Geometry):
                 item.Position = builder.create_axis2_placement_3d_from_matrix(position)
                 if old_position:
                     ifcopenshell.util.element.remove_deep2(tool.Ifc.get(), old_position)
-            if item.is_a("IfcHalfSpaceSolid"):
+            elif item.is_a("IfcHalfSpaceSolid"):
                 has_changed = True
                 surface = item.BaseSurface
                 if surface.is_a("IfcPlane"):
diff --git a/src/ifcopenshell-python/ifcopenshell/util/shape_builder.py b/src/ifcopenshell-python/ifcopenshell/util/shape_builder.py
index 02295462d7..5b336d8e1e 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/shape_builder.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/shape_builder.py
@@ -912,6 +912,16 @@ class ShapeBuilder:
         """
         return self.file.createIfcBlock(self.create_axis2_placement_3d(position), x_length, y_length, z_length)
 
+    def half_space_solid(
+        self, plane: ifcopenshell.entity_instance, agreement_flag: bool = False
+    ) -> ifcopenshell.entity_instance:
+        """
+        :param plane: The IfcPlane representing the half space.
+        :param agreement_flag: False if +Z represents the void
+        :return: IfcHalfSpaceSolid
+        """
+        return self.file.createIfcHalfSpaceSolid(plane, AgreementFlag=agreement_flag)
+
     def extrude(
         self,
         profile_or_curve: ifcopenshell.entity_instance,