diff --git a/src/ifcblenderexport/blenderbim/bim/__init__.py b/src/ifcblenderexport/blenderbim/bim/__init__.py
index 564e2fcea5..576eb1e207 100644
--- a/src/ifcblenderexport/blenderbim/bim/__init__.py
+++ b/src/ifcblenderexport/blenderbim/bim/__init__.py
@@ -17,6 +17,7 @@ if bpy is not None:
     from .module.model import door as model_door
     from .module.model import window as model_window
     from .module.model import slab as model_slab
+    from .module.model import opening as model_opening
 
     classes = (
         operator.AssignClass,
@@ -297,6 +298,7 @@ if bpy is not None:
         model_door.BIM_OT_add_object,
         model_window.BIM_OT_add_object,
         model_slab.BIM_OT_add_object,
+        model_opening.BIM_OT_add_object,
         )
 
     def menu_func_export(self, context):
@@ -338,6 +340,7 @@ if bpy is not None:
         bpy.types.VIEW3D_MT_mesh_add.append(model_door.add_object_button)
         bpy.types.VIEW3D_MT_mesh_add.append(model_window.add_object_button)
         bpy.types.VIEW3D_MT_mesh_add.append(model_slab.add_object_button)
+        bpy.types.VIEW3D_MT_mesh_add.append(model_opening.add_object_button)
 
     def unregister():
         for cls in reversed(classes):
@@ -363,3 +366,4 @@ if bpy is not None:
         bpy.types.VIEW3D_MT_mesh_add.remove(model_door.add_object_button)
         bpy.types.VIEW3D_MT_mesh_add.remove(model_window.add_object_button)
         bpy.types.VIEW3D_MT_mesh_add.remove(model_slab.add_object_button)
+        bpy.types.VIEW3D_MT_mesh_add.remove(model_opening.add_object_button)
diff --git a/src/ifcblenderexport/blenderbim/bim/module/model/opening.py b/src/ifcblenderexport/blenderbim/bim/module/model/opening.py
new file mode 100644
index 0000000000..fb7066b91f
--- /dev/null
+++ b/src/ifcblenderexport/blenderbim/bim/module/model/opening.py
@@ -0,0 +1,40 @@
+import bpy
+import bmesh
+from bpy.types import Operator
+from bpy.props import FloatVectorProperty, FloatProperty, IntProperty
+from bpy_extras.object_utils import AddObjectHelper, object_data_add
+from mathutils import Vector
+
+def add_object(self, context):
+    bm = bmesh.new()
+    bmesh.ops.create_cube(bm, size=self.size)
+    bm.verts.ensure_lookup_table()
+    bm.edges.ensure_lookup_table()
+    bm.faces.ensure_lookup_table()
+    mesh = bpy.data.meshes.new(name="Dumb Opening")
+    bm.to_mesh(mesh)
+    bm.free()
+    obj = object_data_add(context, mesh, operator=self)
+    obj.name = 'IfcOpening/Dumb Opening'
+    obj.display_type = 'WIRE'
+    attribute = obj.BIMObjectProperties.attributes.add()
+    attribute.name = 'PredefinedType'
+    attribute.string_value = 'OPENING'
+
+
+class BIM_OT_add_object(Operator, AddObjectHelper):
+    bl_idname = "mesh.add_opening"
+    bl_label = "Dumb Opening"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    size: FloatProperty(name='Size', default=2)
+
+    def execute(self, context):
+        add_object(self, context)
+        return {'FINISHED'}
+
+
+def add_object_button(self, context):
+    self.layout.operator(
+        BIM_OT_add_object.bl_idname,
+        icon='PLUGIN')