diff --git a/src/bonsai/bonsai/tool/feature.py b/src/bonsai/bonsai/tool/feature.py
new file mode 100644
index 0000000000..d8bcbfb162
--- /dev/null
+++ b/src/bonsai/bonsai/tool/feature.py
@@ -0,0 +1,73 @@
+# Bonsai - OpenBIM Blender Add-on
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of Bonsai.
+#
+# Bonsai is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Bonsai is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Bonsai.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+import bonsai.core.tool
+import bonsai.tool as tool
+import bonsai.bim.helper
+import ifcopenshell
+from typing import Iterable
+
+
+class Feature(bonsai.core.tool.Feature):
+    # TODO: consolidate module/model/opening and module/void into new module/feature
+
+    @classmethod
+    def add_feature(cls, featured_obj: bpy.types.Object, feature_objs: Iterable[bpy.types.Object]) -> None:
+        featured_element = tool.Ifc.get_entity(featured_obj)
+
+        has_visible_openings = False
+        for opening in [r.RelatedOpeningElement for r in featured_element.HasOpenings]:
+            if tool.Ifc.get_object(opening):
+                has_visible_openings = True
+                break
+
+        for feature_obj in feature_objs:
+            feature_element = tool.Ifc.get_entity(feature_obj)
+
+            # Sync placement before void.add_opening.
+            if tool.Ifc.is_moved(featured_obj):
+                bonsai.core.geometry.edit_object_placement(tool.Ifc, tool.Geometry, tool.Surveyor, obj=featured_obj)
+
+            element_had_openings = tool.Geometry.has_openings(featured_element)
+            body_context = ifcopenshell.util.representation.get_context(tool.Ifc.get(), "Model", "Body")
+            ifcopenshell.api.run("void.add_opening", tool.Ifc.get(), opening=feature_element, element=featured_element)
+
+            if tool.Ifc.is_moved(feature_obj):
+                bonsai.core.geometry.edit_object_placement(tool.Ifc, tool.Geometry, tool.Surveyor, obj=feature_obj)
+
+        voided_objs = [featured_obj]
+        for subelement in tool.Aggregate.get_parts_recursively(featured_element):
+            if subobj := tool.Ifc.get_object(subelement):
+                voided_objs.append(subobj)
+
+        for voided_obj in voided_objs:
+            if voided_obj.data:
+                if tool.Ifc.is_edited(voided_obj):
+                    voided_element_ = tool.Ifc.get_entity(voided_obj)
+                    if element_had_openings or (voided_element_ != featured_element and voided_element_.HasOpenings):
+                        voided_obj.scale = (1.0, 1.0, 1.0)
+                        tool.Ifc.finish_edit(voided_obj)
+                    else:
+                        bpy.ops.bim.update_representation(obj=voided_obj.name)
+
+                if tool.Ifc.is_moved(voided_obj):
+                    bonsai.core.geometry.edit_object_placement(tool.Ifc, tool.Geometry, tool.Surveyor, obj=voided_obj)
+
+                tool.Geometry.reload_representation(voided_obj)
+            tool.Geometry.lock_scale(voided_obj)