diff --git a/src/blenderbim/blenderbim/bim/module/model/__init__.py b/src/blenderbim/blenderbim/bim/module/model/__init__.py
index 5d4a2009e6..04aa2eb38b 100644
--- a/src/blenderbim/blenderbim/bim/module/model/__init__.py
+++ b/src/blenderbim/blenderbim/bim/module/model/__init__.py
@@ -42,6 +42,7 @@ classes = (
     opening.AddPotentialHalfSpaceSolid,
     opening.AddPotentialOpening,
     opening.EditOpenings,
+    opening.FlipFill,
     opening.HideBooleans,
     opening.HideOpenings,
     opening.RecalculateFill,
diff --git a/src/blenderbim/blenderbim/bim/module/model/opening.py b/src/blenderbim/blenderbim/bim/module/model/opening.py
index 0d85476eff..602c6cf2a5 100644
--- a/src/blenderbim/blenderbim/bim/module/model/opening.py
+++ b/src/blenderbim/blenderbim/bim/module/model/opening.py
@@ -218,6 +218,36 @@ class RecalculateFill(bpy.types.Operator, tool.Ifc.Operator):
         return {"FINISHED"}
 
 
+class FlipFill(bpy.types.Operator, tool.Ifc.Operator):
+    bl_idname = "bim.flip_fill"
+    bl_label = "Flip Fill"
+    bl_options = {"REGISTER", "UNDO"}
+
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
+    def _execute(self, context):
+        for obj in context.selected_objects:
+            element = tool.Ifc.get_entity(obj)
+            if not element or not element.FillsVoids:
+                continue
+
+            flip_matrix = Matrix.Rotation(pi, 4, "Z")
+
+            bottom_left = obj.matrix_world @ Vector(obj.bound_box[0])
+            top_right = obj.matrix_world @ Vector(obj.bound_box[6])
+            center = obj.matrix_world.col[3].to_3d().copy()
+            center_offset = center - bottom_left
+            flipped_center = top_right - center_offset
+
+            obj.matrix_world = obj.matrix_world @ flip_matrix
+            obj.matrix_world.col[3][0] = flipped_center[0]
+            obj.matrix_world.col[3][1] = flipped_center[1]
+            bpy.context.view_layer.update()
+        return {"FINISHED"}
+
+
 class AddPotentialOpening(Operator, AddObjectHelper):
     bl_idname = "bim.add_potential_opening"
     bl_label = "Add Potential Opening"
diff --git a/src/blenderbim/blenderbim/bim/module/model/workspace.py b/src/blenderbim/blenderbim/bim/module/model/workspace.py
index 288b51c3d6..ba01fd2c78 100644
--- a/src/blenderbim/blenderbim/bim/module/model/workspace.py
+++ b/src/blenderbim/blenderbim/bim/module/model/workspace.py
@@ -213,6 +213,11 @@ class BimToolUI:
             row.label(text="", icon="EVENT_SHIFT")
             row.label(text="", icon="EVENT_G")
             row.operator("bim.hotkey", text="Regen").hotkey = "S_G"
+
+            row = cls.layout.row(align=True)
+            row.label(text="", icon="EVENT_SHIFT")
+            row.label(text="", icon="EVENT_F")
+            row.operator("bim.hotkey", text="Flip").hotkey = "S_F"
         elif AuthoringData.data["active_class"] in (
             "IfcCableCarrierSegmentType",
             "IfcCableSegmentType",
@@ -399,6 +404,8 @@ class Hotkey(bpy.types.Operator, tool.Ifc.Operator):
     def hotkey_S_F(self):
         if self.active_class in ("IfcWall", "IfcWallStandardCase"):
             bpy.ops.bim.flip_wall()
+        elif self.active_class in ("IfcWindow", "IfcWindowStandardCase", "IfcDoor", "IfcDoorStandardCase"):
+            bpy.ops.bim.flip_fill()
 
     def hotkey_S_G(self):
         if self.active_class in ("IfcWall", "IfcWallStandardCase"):