diff --git a/src/blenderbim/blenderbim/bim/module/bimtester/operator.py b/src/blenderbim/blenderbim/bim/module/bimtester/operator.py
index 5e71a956cd..7bf9905313 100644
--- a/src/blenderbim/blenderbim/bim/module/bimtester/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/bimtester/operator.py
@@ -39,6 +39,11 @@ class ExecuteBIMTester(bpy.types.Operator):
     bl_idname = "bim.execute_bim_tester"
     bl_label = "Execute BIMTester"
 
+    @classmethod
+    def poll(cls, context):
+        props = context.scene.BimTesterProperties
+        return props.ifc_file and props.feature
+
     def execute(self, context):
         props = context.scene.BimTesterProperties
 
diff --git a/src/blenderbim/blenderbim/bim/module/clash/operator.py b/src/blenderbim/blenderbim/bim/module/clash/operator.py
index b924905483..90223e46d4 100644
--- a/src/blenderbim/blenderbim/bim/module/clash/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/clash/operator.py
@@ -25,6 +25,7 @@ import logging
 import numpy as np
 from mathutils import Matrix
 from math import radians
+from blenderbim.bim.ifc import IfcStore
 
 
 class ExportClashSets(bpy.types.Operator):
@@ -124,7 +125,7 @@ class AddClashSource(bpy.types.Operator):
     group: bpy.props.StringProperty()
 
     def execute(self, context):
-        clash_set = context.scene.BIMClashProperties.clash_sets[context.scene.BIMClashProperties.active_clash_set_index]
+        clash_set = context.scene.BIMClashProperties.active_clash_set
         source = getattr(clash_set, self.group).add()
         return {"FINISHED"}
 
@@ -137,7 +138,7 @@ class RemoveClashSource(bpy.types.Operator):
     group: bpy.props.StringProperty()
 
     def execute(self, context):
-        clash_set = context.scene.BIMClashProperties.clash_sets[context.scene.BIMClashProperties.active_clash_set_index]
+        clash_set = context.scene.BIMClashProperties.active_clash_set
         getattr(clash_set, self.group).remove(self.index)
         return {"FINISHED"}
 
@@ -152,7 +153,7 @@ class SelectClashSource(bpy.types.Operator):
     group: bpy.props.StringProperty()
 
     def execute(self, context):
-        clash_set = context.scene.BIMClashProperties.clash_sets[context.scene.BIMClashProperties.active_clash_set_index]
+        clash_set = context.scene.BIMClashProperties.active_clash_set
         getattr(clash_set, self.group)[self.index].name = self.filepath
         return {"FINISHED"}
 
@@ -276,9 +277,7 @@ class SelectIfcClashResults(bpy.types.Operator):
         self.filepath = bpy.path.ensure_ext(self.filepath, ".json")
         with open(self.filepath) as f:
             clash_sets = json.load(f)
-        clash_set_name = context.scene.BIMClashProperties.clash_sets[
-            context.scene.BIMClashProperties.active_clash_set_index
-        ].name
+        clash_set_name = context.scene.BIMClashProperties.active_clash_set.name
         global_ids = []
         for clash_set in clash_sets:
             if clash_set["name"] != clash_set_name:
@@ -303,6 +302,10 @@ class SmartClashGroup(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     filepath: bpy.props.StringProperty(subtype="FILE_PATH")
 
+    @classmethod
+    def poll(cls, context):
+        return context.scene.BIMClashProperties.clash_results_path
+
     def execute(self, context):
         import ifcclash
 
@@ -326,9 +329,7 @@ class SmartClashGroup(bpy.types.Operator):
         with open(save_path, "w") as f:
             f.write(json.dumps(smart_grouped_clashes))
 
-        clash_set_name = context.scene.BIMClashProperties.clash_sets[
-            context.scene.BIMClashProperties.active_clash_set_index
-        ].name
+        clash_set_name = context.scene.BIMClashProperties.active_clash_set.name
 
         # Reset the list of smart_clash_groups for the UI
         context.scene.BIMClashProperties.smart_clash_groups.clear()
@@ -355,12 +356,14 @@ class LoadSmartGroupsForActiveClashSet(bpy.types.Operator):
     bl_label = "Load Smart Groups for Active Clash Set"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.scene.BIMClashProperties.active_clash_set
+
     def execute(self, context):
         smart_groups_path = bpy.path.ensure_ext(context.scene.BIMClashProperties.smart_grouped_clashes_path, ".json")
 
-        clash_set_name = context.scene.BIMClashProperties.clash_sets[
-            context.scene.BIMClashProperties.active_clash_set_index
-        ].name
+        clash_set_name = context.scene.BIMClashProperties.active_clash_set.name
 
         with open(smart_groups_path) as f:
             smart_grouped_clashes = json.load(f)
@@ -389,11 +392,14 @@ class SelectSmartGroup(bpy.types.Operator):
     bl_label = "Select Smart Group"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file() and context.visible_objects and context.scene.BIMClashProperties.active_smart_group
+
     def execute(self, context):
+        self.file = IfcStore.get_file()
         # Select smart group in view
-        selected_smart_group = context.scene.BIMClashProperties.smart_clash_groups[
-            context.scene.BIMCLashProperties.active_smart_group_index
-        ]
+        selected_smart_group = context.scene.BIMClashProperties.active_smart_group
         # print(selected_smart_group.number)
 
         for obj in context.visible_objects:
diff --git a/src/blenderbim/blenderbim/bim/module/clash/prop.py b/src/blenderbim/blenderbim/bim/module/clash/prop.py
index 5ed121757f..e721db86ce 100644
--- a/src/blenderbim/blenderbim/bim/module/clash/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/clash/prop.py
@@ -69,3 +69,15 @@ class BIMClashProperties(PropertyGroup):
     smart_clash_grouping_max_distance: IntProperty(
         name="Smart Clash Grouping Max Distance", default=3, soft_min=1, soft_max=10
     )
+
+    @property
+    def active_clash_set(self):
+        if not self.clash_sets:
+            return None
+        return self.clash_sets[self.active_clash_set_index]
+
+    @property
+    def active_smart_group(self):
+        if not self.smart_clash_groups:
+            return None
+        return self.smart_clash_groups[self.active_smart_group_index]
diff --git a/src/blenderbim/blenderbim/bim/module/clash/ui.py b/src/blenderbim/blenderbim/bim/module/clash/ui.py
index 2080a0c723..9b6d021a42 100644
--- a/src/blenderbim/blenderbim/bim/module/clash/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/clash/ui.py
@@ -57,7 +57,7 @@ class BIM_PT_ifcclash(Panel):
         layout.template_list("BIM_UL_clash_sets", "", props, "clash_sets", props, "active_clash_set_index")
 
         if props.active_clash_set_index < len(props.clash_sets):
-            clash_set = props.clash_sets[props.active_clash_set_index]
+            clash_set = props.active_clash_set
 
             row = layout.row(align=True)
             row.prop(clash_set, "name")
diff --git a/src/blenderbim/blenderbim/bim/module/debug/operator.py b/src/blenderbim/blenderbim/bim/module/debug/operator.py
index a70f5e8afb..7ef5b31b99 100644
--- a/src/blenderbim/blenderbim/bim/module/debug/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/debug/operator.py
@@ -165,7 +165,7 @@ class SelectHighPolygonMeshes(bpy.types.Operator):
 
     def execute(self, context):
         [o.select_set(True) for o in context.view_layer.objects
-            if o.type == 'MESH'
+            if o.type == "MESH"
             and len(o.data.polygons) > context.scene.BIMDebugProperties.number_of_polygons]
         return {"FINISHED"}
 
diff --git a/src/blenderbim/blenderbim/bim/module/drawing/helper.py b/src/blenderbim/blenderbim/bim/module/drawing/helper.py
index eab5fbf9b0..e7a1c9ad19 100644
--- a/src/blenderbim/blenderbim/bim/module/drawing/helper.py
+++ b/src/blenderbim/blenderbim/bim/module/drawing/helper.py
@@ -263,7 +263,7 @@ def get_active_drawing(scene):
     if props.active_drawing_index is None or len(props.drawings) == 0:
         return None, None
     try:
-        drawing = props.drawings[props.active_drawing_index]
+        drawing = props.active_drawing
         return scene.collection.children["Views"].children[f"IfcGroup/{drawing.name}"], drawing.camera
     except (KeyError, IndexError):
         raise RuntimeError("missing drawing collection")
diff --git a/src/blenderbim/blenderbim/bim/module/drawing/operator.py b/src/blenderbim/blenderbim/bim/module/drawing/operator.py
index eca290ca9c..d78db7b340 100644
--- a/src/blenderbim/blenderbim/bim/module/drawing/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/drawing/operator.py
@@ -60,6 +60,10 @@ class AddDrawing(bpy.types.Operator):
     bl_label = "Add Drawing"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file()
+
     def execute(self, context):
         return IfcStore.execute_ifc_operator(self, context)
 
@@ -502,12 +506,14 @@ class AddAnnotation(bpy.types.Operator):
     obj_name: bpy.props.StringProperty()
     data_type: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file() and context.scene.camera
+
     def execute(self, context):
         return IfcStore.execute_ifc_operator(self, context)
 
     def _execute(self, context):
-        if not context.scene.camera:
-            return {"FINISHED"}
         subcontext = ifcopenshell.util.representation.get_context(
             IfcStore.get_file(), "Plan", "Annotation", context.scene.camera.data.BIMCameraProperties.target_view
         )
@@ -563,7 +569,7 @@ class OpenSheet(bpy.types.Operator):
         open_with_user_command(
             context.preferences.addons["blenderbim"].preferences.svg_command,
             os.path.join(
-                context.scene.BIMProperties.data_dir, "sheets", props.sheets[props.active_sheet_index].name + ".svg"
+                context.scene.BIMProperties.data_dir, "sheets", props.active_sheet.name + ".svg"
             ),
         )
         return {"FINISHED"}
@@ -581,9 +587,9 @@ class AddDrawingToSheet(bpy.types.Operator):
         sheet_builder.data_dir = context.scene.BIMProperties.data_dir
         try:
             sheet_builder.add_drawing(
-                props.drawings[props.active_drawing_index].name, props.sheets[props.active_sheet_index].name
+                props.drawings.active_drawing.name, props.active_sheet.name
             )
-        except:
+        except FileNotFoundError:
             self.report({"ERROR"}, "Drawings need to be created before being added to a sheet")
         return {"FINISHED"}
 
@@ -596,7 +602,7 @@ class CreateSheets(bpy.types.Operator):
     def execute(self, context):
         scene = context.scene
         props = scene.DocProperties
-        name = props.sheets[props.active_sheet_index].name
+        name = props.active_sheet.name
         sheet_builder = sheeter.SheetBuilder()
         sheet_builder.data_dir = scene.BIMProperties.data_dir
         sheet_builder.build(name)
@@ -650,18 +656,23 @@ class OpenView(bpy.types.Operator):
 
 
 class OpenViewCamera(bpy.types.Operator):
+    """Select this drawing's camera object and expand its drawing properties"""
     bl_idname = "bim.open_view_camera"
     bl_label = "Open View Camera"
     bl_options = {"REGISTER", "UNDO"}
     view_name: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return bpy.context.object.mode == "OBJECT"
+
     def execute(self, context):
-        new_drawing_index = context.scene.DocProperties.drawings.find(self.view_name)
-        context.scene.DocProperties.active_drawing_index = new_drawing_index
-        drawing = context.scene.DocProperties.drawings[new_drawing_index]
-        context.view_layer.objects.active = drawing.camera
+        doc_props = context.scene.DocProperties
+        doc_props.active_drawing_index = doc_props.drawings.find(self.view_name)
+        drawing = doc_props.active_drawing
         bpy.ops.object.select_all(action="DESELECT")
         drawing.camera.select_set(True)
+        context.view_layer.objects.active = drawing.camera
         for area in context.screen.areas:
             if area.ui_type == "PROPERTIES":
                 for space in area.spaces:
@@ -712,6 +723,7 @@ class SelectDocIfcFile(bpy.types.Operator):
     bl_idname = "bim.select_doc_ifc_file"
     bl_label = "Select Documentation IFC File"
     bl_options = {"REGISTER", "UNDO"}
+    filter_glob: bpy.props.StringProperty(default="*.ifc;*.ifczip;*.ifcxml", options={"HIDDEN"})
     filepath: bpy.props.StringProperty(subtype="FILE_PATH")
     index: bpy.props.IntProperty()
 
@@ -1059,7 +1071,7 @@ class SelectScheduleFile(bpy.types.Operator):
 
     def execute(self, context):
         props = context.scene.DocProperties
-        props.schedules[props.active_schedule_index].file = self.filepath
+        props.active_schedule.file = self.filepath
         return {"FINISHED"}
 
     def invoke(self, context, event):
@@ -1071,9 +1083,13 @@ class BuildSchedule(bpy.types.Operator):
     bl_idname = "bim.build_schedule"
     bl_label = "Build Schedule"
 
+    @classmethod
+    def poll(cls, context):
+        return context.scene.DocProperties.active_schedule.file
+
     def execute(self, context):
         props = context.scene.DocProperties
-        schedule = props.schedules[props.active_schedule_index]
+        schedule = props.active_schedule
         schedule_creator = scheduler.Scheduler()
         outfile = os.path.join(context.scene.BIMProperties.data_dir, "schedules", schedule.name + ".svg")
         schedule_creator.schedule(schedule.file, outfile)
@@ -1092,7 +1108,7 @@ class AddScheduleToSheet(bpy.types.Operator):
         sheet_builder = sheeter.SheetBuilder()
         sheet_builder.data_dir = context.scene.BIMProperties.data_dir
         sheet_builder.add_schedule(
-            props.schedules[props.active_schedule_index].name, props.sheets[props.active_sheet_index].name
+            props.active_schedule.name, props.active_sheet.name
         )
         return {"FINISHED"}
 
@@ -1143,13 +1159,12 @@ class CleanWireframes(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
 
     def execute(self, context):
-        objects = context.scene.objects
         if context.selected_objects:
             objects = context.selected_objects
-        for obj in objects:
-            if not isinstance(obj.data, bpy.types.Mesh):
-                continue
-            if "EDGE_SPLIT" not in [m.type for m in obj.modifiers]:
+        else:
+            objects = context.scene.objects
+        for obj in (o for o in objects if o.type == "MESH"):
+            if "EDGE_SPLIT" not in (m.type for m in obj.modifiers):
                 obj.modifiers.new("EdgeSplit", "EDGE_SPLIT")
         return {"FINISHED"}
 
@@ -1159,11 +1174,13 @@ class CopyGrid(bpy.types.Operator):
     bl_label = "Add Grid"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return helper.get_active_drawing(context.scene)[0] is not None
+
     def execute(self, context):
         proj_coll = helper.get_project_collection(context.scene)
         view_coll, camera = helper.get_active_drawing(context.scene)
-        if view_coll is None:
-            return {"CANCELLED"}
         is_ortho = camera.data.type == "ORTHO"
         bounds = helper.ortho_view_frame(camera.data) if is_ortho else None
         clipping = is_ortho and camera.data.BIMCameraProperties.target_view in ("PLAN_VIEW", "REFLECTED_PLAN_VIEW")
@@ -1240,13 +1257,15 @@ class AddSectionsAnnotations(bpy.types.Operator):
     bl_label = "Add Sections"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):        
+        camera = helper.get_active_drawing(context.scene)[1]
+        return camera and camera.data.type == "ORTHO"
+
     def execute(self, context):
         scene = context.scene
         view_coll, camera = helper.get_active_drawing(scene)
-        is_ortho = camera.data.type == "ORTHO"
-        if not is_ortho:
-            return {"CANCELLED"}
-        bounds = helper.ortho_view_frame(camera.data) if is_ortho else None
+        bounds = helper.ortho_view_frame(camera.data)
 
         drawings = [
             d
diff --git a/src/blenderbim/blenderbim/bim/module/drawing/prop.py b/src/blenderbim/blenderbim/bim/module/drawing/prop.py
index 210ad986e8..150d800e32 100644
--- a/src/blenderbim/blenderbim/bim/module/drawing/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/drawing/prop.py
@@ -269,6 +269,17 @@ class DocProperties(PropertyGroup):
         name="Decorations Colour", subtype="COLOR", default=(1, 0, 0, 1), min=0.0, max=1.0, size=4
     )
 
+    @property
+    def active_schedule(self):
+        return self.schedules[self.active_schedule_index]   
+    
+    @property
+    def active_drawing(self):
+        return self.drawings[self.active_drawing_index]    
+        
+    @property
+    def active_sheet(self):
+        return self.sheets[self.active_sheet_index]
 
 class BIMCameraProperties(PropertyGroup):
     view_name: StringProperty(name="View Name")
diff --git a/src/blenderbim/blenderbim/bim/module/drawing/ui.py b/src/blenderbim/blenderbim/bim/module/drawing/ui.py
index 464f3713e9..2662e885ec 100644
--- a/src/blenderbim/blenderbim/bim/module/drawing/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/drawing/ui.py
@@ -170,9 +170,9 @@ class BIM_PT_drawings(Panel):
         if props.drawings:
             if props.active_drawing_index < len(props.drawings):
                 op = row.operator("bim.open_view", icon="URL", text="")
-                op.view = props.drawings[props.active_drawing_index].name
+                op.view = props.active_drawing.name
                 row.operator("bim.remove_drawing", icon="X", text="").index = props.active_drawing_index
-            layout.template_list("BIM_UL_generic", "", props, "drawings", props, "active_drawing_index")
+            layout.template_list("BIM_UL_drawinglist", "", props, "drawings", props, "active_drawing_index")
 
         row = layout.row()
         row.operator("bim.add_ifc_file")
@@ -206,7 +206,7 @@ class BIM_PT_schedules(Panel):
             layout.template_list("BIM_UL_generic", "", props, "schedules", props, "active_schedule_index")
 
             row = layout.row()
-            row.prop(props.schedules[props.active_schedule_index], "file")
+            row.prop(props.active_schedule, "file")
             row.operator("bim.select_schedule_file", icon="FILE_FOLDER", text="")
 
 
@@ -343,7 +343,7 @@ class BIM_PT_annotation_utilities(Panel):
         if props.drawings:
             if props.active_drawing_index < len(props.drawings):
                 op = row.operator("bim.open_view", icon="URL", text="")
-                op.view = props.drawings[props.active_drawing_index].name
+                op.view = props.active_drawing.name
                 row.operator("bim.remove_drawing", icon="X", text="").index = props.active_drawing_index
             layout.template_list("BIM_UL_drawinglist", "", props, "drawings", props, "active_drawing_index")
 
diff --git a/src/blenderbim/blenderbim/bim/module/georeference/operator.py b/src/blenderbim/blenderbim/bim/module/georeference/operator.py
index b9066ab2ac..2026de99e4 100644
--- a/src/blenderbim/blenderbim/bim/module/georeference/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/georeference/operator.py
@@ -237,6 +237,12 @@ class ConvertLocalToGlobal(bpy.types.Operator):
     bl_label = "Convert Local To Global"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        file = IfcStore.get_file()
+        props = context.scene.BIMGeoreferenceProperties
+        return file and props.coordinate_input.count(",") == 2
+
     def execute(self, context):
         if not Data.is_loaded:
             Data.load(IfcStore.get_file())
@@ -284,6 +290,13 @@ class ConvertGlobalToLocal(bpy.types.Operator):
     bl_label = "Convert Global To Local"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        file = IfcStore.get_file()
+        props = context.scene.BIMGeoreferenceProperties
+        return file and file.by_type("IfcUnitAssignment") \
+            and props.coordinate_input.count(",") == 2
+
     def execute(self, context):
         if not Data.is_loaded:
             Data.load(IfcStore.get_file())
@@ -330,6 +343,11 @@ class GetCursorLocation(bpy.types.Operator):
     bl_label = "Get Cursor Location"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        file = IfcStore.get_file()
+        return file and file.by_type("IfcUnitAssignment")
+
     def execute(self, context):
         props = context.scene.BIMGeoreferenceProperties
         scale = ifcopenshell.util.unit.calculate_unit_scale(IfcStore.get_file())
@@ -343,6 +361,12 @@ class SetCursorLocation(bpy.types.Operator):
     bl_label = "Set Cursor Location"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        file = IfcStore.get_file()
+        props = context.scene.BIMGeoreferenceProperties
+        return file and file.by_type("IfcUnitAssignment") and props.coordinate_output.count(",") == 2
+
     def execute(self, context):
         props = context.scene.BIMGeoreferenceProperties
         scale = ifcopenshell.util.unit.calculate_unit_scale(IfcStore.get_file())
diff --git a/src/blenderbim/blenderbim/bim/module/georeference/prop.py b/src/blenderbim/blenderbim/bim/module/georeference/prop.py
index f1cda83e62..900a1bdaaa 100644
--- a/src/blenderbim/blenderbim/bim/module/georeference/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/georeference/prop.py
@@ -52,8 +52,8 @@ class BIMGeoreferenceProperties(PropertyGroup):
         default="foot",
     )
     is_map_unit_null: BoolProperty(name="Is Map Unit Null")
-    coordinate_input: StringProperty(name="Coordinate Input")
-    coordinate_output: StringProperty(name="Coordinate Output")
+    coordinate_input: StringProperty(name="Coordinate Input", description="Formatted \"x,y,z\" (without quotes)")
+    coordinate_output: StringProperty(name="Coordinate Output", description="Formatted \"x,y,z\" (without quotes)")
     has_blender_offset: BoolProperty(name="Has Blender Offset")
     blender_eastings: StringProperty(name="Blender Eastings", default="0")
     blender_northings: StringProperty(name="Blender Northings", default="0")
diff --git a/src/blenderbim/blenderbim/bim/module/model/product.py b/src/blenderbim/blenderbim/bim/module/model/product.py
index bb3c92e584..c03062d007 100644
--- a/src/blenderbim/blenderbim/bim/module/model/product.py
+++ b/src/blenderbim/blenderbim/bim/module/model/product.py
@@ -129,6 +129,10 @@ class AddTypeInstance(bpy.types.Operator):
         else:
             if collection_obj and collection_obj.BIMObjectProperties.ifc_definition_id:
                 obj.location[2] = collection_obj.location[2] - min([v[2] for v in obj.bound_box])
+
+        bpy.ops.object.select_all(action='DESELECT')
+        obj.select_set(True)
+        context.view_layer.objects.active = obj
         return {"FINISHED"}
 
     def generate_layered_element(self, ifc_class, relating_type):
@@ -205,8 +209,14 @@ class DynamicallyVoidProduct(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     obj: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file()
+
     def execute(self, context):
         obj = bpy.data.objects.get(self.obj)
+        if obj is None:
+            return {"FINISHED"}
         product = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
         if not product.HasOpenings:
             return {"FINISHED"}
diff --git a/src/blenderbim/blenderbim/bim/module/model/ui.py b/src/blenderbim/blenderbim/bim/module/model/ui.py
index dbec2fe8c7..00a34969bf 100644
--- a/src/blenderbim/blenderbim/bim/module/model/ui.py
+++ b/src/blenderbim/blenderbim/bim/module/model/ui.py
@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU General Public License
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
+import blenderbim.bim.module.type.prop as type_prop
 from bpy.types import Panel
 from blenderbim.bim.ifc import IfcStore
 
@@ -35,9 +36,21 @@ class BIM_PT_authoring(Panel):
     def draw(self, context):
         tprops = context.scene.BIMTypeProperties
         col = self.layout.column(align=True)
-        col.prop(tprops, "ifc_class", text="", icon="FILE_VOLUME")
-        col.prop(tprops, "relating_type", text="", icon="FILE_3D")
-        col.operator("bim.add_type_instance", icon="ADD")
+        enabled = True
+        
+        if type_prop.getIfcTypes(tprops, context):
+            col.prop(tprops, "ifc_class", text="", icon="FILE_VOLUME")
+        else:
+            col.label(text="No IFC Class", icon="FILE_VOLUME")
+            enabled = False
+        if type_prop.getAvailableTypes(tprops, context):
+            col.prop(tprops, "relating_type", text="", icon="FILE_3D")
+        else:
+            col.label(text="No Relating Type", icon="FILE_3D")
+            enabled = False
+        row = col.row()
+        row.operator("bim.add_type_instance", icon="ADD")
+        row.enabled = enabled
 
 
 class BIM_PT_authoring_architectural(Panel):
@@ -76,9 +89,8 @@ class BIM_PT_misc_utilities(Panel):
         layout = self.layout
         props = context.scene.BIMProperties
 
-        row = layout.row()
+        row = layout.split(factor=0.2, align=True)
         row.prop(props, "override_colour", text="")
-        row = layout.row(align=True)
         row.operator("bim.set_override_colour")
         row = layout.row(align=True)
         row.operator("bim.set_viewport_shadow_from_sun")
diff --git a/src/blenderbim/blenderbim/bim/module/model/wall.py b/src/blenderbim/blenderbim/bim/module/model/wall.py
index c18acfba78..3678422016 100644
--- a/src/blenderbim/blenderbim/bim/module/model/wall.py
+++ b/src/blenderbim/blenderbim/bim/module/model/wall.py
@@ -74,12 +74,14 @@ class JoinWall(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     join_type: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
-        selected_objs = context.selected_objects
+        selected_objs = [o for o in context.selected_objects if o.BIMObjectProperties.ifc_definition_id]
         for obj in selected_objs:
             bpy.ops.bim.dynamically_void_product(obj=obj.name)
-        if len(selected_objs) == 0:
-            return {"FINISHED"}
         if not self.join_type:
             for obj in selected_objs:
                 DumbWallJoiner(obj, obj).unjoin()
@@ -114,11 +116,14 @@ class AlignWall(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     align_type: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        selected_valid_objects = [o for o in context.selected_objects if o.data and hasattr(o.data, "transform")]
+        return context.active_object and len(selected_valid_objects) > 1
+
     def execute(self, context):
-        selected_objs = context.selected_objects
-        if len(selected_objs) < 2 or not context.active_object:
-            return {"FINISHED"}
-        for obj in selected_objs:
+        selected_objects = [o for o in context.selected_objects if o.data and hasattr(o.data, "transform")]
+        for obj in selected_objects:
             if obj == context.active_object:
                 continue
             aligner = DumbWallAligner(obj, context.active_object)
@@ -137,10 +142,12 @@ class FlipWall(bpy.types.Operator):
     bl_label = "Flip Wall"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
-        selected_objs = context.selected_objects
-        if len(selected_objs) == 0:
-            return {"FINISHED"}
+        selected_objs = [o for o in context.selected_objects if o.data and hasattr(o.data, "transform")]
         for obj in selected_objs:
             DumbWallFlipper(obj).flip()
             IfcStore.edited_objs.add(obj)
@@ -152,12 +159,14 @@ class SplitWall(bpy.types.Operator):
     bl_label = "Split Wall"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
-        selected_objs = context.selected_objects
-        if len(selected_objs) == 0:
-            return {"FINISHED"}
+        selected_objs = [o for o in context.selected_objects if o.data and hasattr(o.data, "transform")]
         for obj in selected_objs:
-            DumbWallSplitter(obj, bpy.context.scene.cursor.location).split()
+            DumbWallSplitter(obj, context.scene.cursor.location).split()
             IfcStore.edited_objs.add(obj)
         return {"FINISHED"}
 
diff --git a/src/blenderbim/blenderbim/bim/module/model/workspace.py b/src/blenderbim/blenderbim/bim/module/model/workspace.py
index 59c8fd3234..7215a1bb2d 100644
--- a/src/blenderbim/blenderbim/bim/module/model/workspace.py
+++ b/src/blenderbim/blenderbim/bim/module/model/workspace.py
@@ -19,6 +19,7 @@
 
 import os
 import bpy
+import blenderbim.bim.module.type.prop as type_prop
 from bpy.types import WorkSpaceTool
 from blenderbim.bim.ifc import IfcStore
 
@@ -52,9 +53,20 @@ class BimTool(WorkSpaceTool):
 
     def draw_settings(context, layout, tool):
         row = layout.row(align=True)
+        if not IfcStore.get_file():
+            row.label(text="No IFC Project", icon="ERROR")
+            return
         props = context.scene.BIMTypeProperties
-        row.prop(props, "ifc_class", text="")
-        row.prop(props, "relating_type", text="")
+        ifc_classes_is_empty = not bool(type_prop.getIfcTypes(props, context))
+        if ifc_classes_is_empty:
+            row.label(text="No IFC Class")
+        else:
+            row.prop(props, "ifc_class", text="")
+        if type_prop.getAvailableTypes(props, context):
+            row.prop(props, "relating_type", text="")
+        else:
+            row.label(text="No Relating Type")
+
 
         row.label(text="", icon="BLANK1")
 
@@ -62,34 +74,35 @@ class BimTool(WorkSpaceTool):
         row.label(text="", icon="EVENT_SHIFT")
         row.label(text="Add Type Instance", icon="EVENT_A")
 
-        if props.ifc_class == "IfcWallType":
-            row = layout.row()
-            row.label(text="Join")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Extend", icon="EVENT_E")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Butt", icon="EVENT_T")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Mitre", icon="EVENT_Y")
+        if not ifc_classes_is_empty:
+            if props.ifc_class == "IfcWallType":
+                row = layout.row()
+                row.label(text="Join")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Extend", icon="EVENT_E")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Butt", icon="EVENT_T")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Mitre", icon="EVENT_Y")
 
-            row = layout.row()
-            row.label(text="Wall Tools")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Flip", icon="EVENT_F")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Split", icon="EVENT_S")
+                row = layout.row()
+                row.label(text="Wall Tools")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Flip", icon="EVENT_F")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Split", icon="EVENT_S")
 
-        if props.ifc_class in ["IfcColumnType", "IfcBeamType", "IfcMemberType"]:
-            row = layout.row()
-            row.label(text="Join")
-            row = layout.row(align=True)
-            row.label(text="", icon="EVENT_SHIFT")
-            row.label(text="Extend", icon="EVENT_E")
+            if props.ifc_class in ("IfcColumnType", "IfcBeamType", "IfcMemberType"):
+                row = layout.row()
+                row.label(text="Join")
+                row = layout.row(align=True)
+                row.label(text="", icon="EVENT_SHIFT")
+                row.label(text="Extend", icon="EVENT_E")
 
         row = layout.row(align=True)
         row.label(text="", icon="EVENT_SHIFT")
@@ -124,11 +137,16 @@ class Hotkey(bpy.types.Operator):
     bl_options = {"REGISTER", "UNDO"}
     hotkey: bpy.props.StringProperty()
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file()
+
     def execute(self, context):
         return IfcStore.execute_ifc_operator(self, context)
 
     def _execute(self, context):
         self.props = context.scene.BIMTypeProperties
+        self.ifc_classes_is_empty = not bool(type_prop.getIfcTypes(self.props, context))
         getattr(self, f"hotkey_{self.hotkey}")()
         return {"FINISHED"}
 
@@ -136,26 +154,29 @@ class Hotkey(bpy.types.Operator):
         bpy.ops.bim.add_type_instance()
 
     def hotkey_S_C(self):
-        if self.props.ifc_class == "IfcWallType":
+        if not self.ifc_classes_is_empty and self.props.ifc_class == "IfcWallType":
             bpy.ops.bim.align_wall(align_type="CENTERLINE")
         else:
             bpy.ops.bim.align_product(align_type="CENTERLINE")
 
     def hotkey_S_E(self):
+        if self.ifc_classes_is_empty:
+            return
         if self.props.ifc_class == "IfcWallType":
             bpy.ops.bim.join_wall(join_type="T")
         elif self.props.ifc_class in ["IfcColumnType", "IfcBeamType", "IfcMemberType"]:
             bpy.ops.bim.extend_profile()
 
     def hotkey_S_V(self):
-        if self.props.ifc_class == "IfcWallType":
+        if not self.ifc_classes_is_empty and self.props.ifc_class == "IfcWallType":
             bpy.ops.bim.align_wall(align_type="INTERIOR")
         else:
             bpy.ops.bim.align_product(align_type="POSITIVE")
 
     def hotkey_S_X(self):
-        if self.props.ifc_class == "IfcWallType":
-            bpy.ops.bim.align_wall(align_type="EXTERIOR")
+        if not self.ifc_classes_is_empty and self.props.ifc_class == "IfcWallType":
+            if bpy.ops.bim.align_wall.poll():
+                bpy.ops.bim.align_wall(align_type="EXTERIOR")
         else:
             bpy.ops.bim.align_product(align_type="NEGATIVE")
 
diff --git a/src/blenderbim/blenderbim/bim/module/qto/helper.py b/src/blenderbim/blenderbim/bim/module/qto/helper.py
index d2c53baaff..8826a8d5b7 100644
--- a/src/blenderbim/blenderbim/bim/module/qto/helper.py
+++ b/src/blenderbim/blenderbim/bim/module/qto/helper.py
@@ -25,12 +25,38 @@ def calculate_height(obj):
     return obj.dimensions[2]
 
 
-def calculate_volume(obj):
-    bm = bmesh.new()
-    bm.from_mesh(obj.data)
-    result = bm.calc_volume()
-    bm.free()
-    return result
+def calculate_edges_lengths(objs, context):
+    return calculate_mesh_quantity(objs, context, lambda bm: sum((e.calc_length() for e in bm.edges if e.select)))
+
+
+def calculate_faces_areas(objs, context):
+    return calculate_mesh_quantity(objs, context, lambda bm: sum((f.calc_area() for f in bm.faces if f.select)))
+
+
+def calculate_volumes(objs, context):
+    return calculate_mesh_quantity(objs, context, lambda bm: bm.calc_volume())
+
+
+def calculate_mesh_quantity(objs: bpy.types.Object, context, operation):
+        """Get the sum of the target quantity on all passed mesh objects
+
+        :param objs: iterable of mesh object 
+        :param context: current execution context
+        :param operation: function which takes a single bmesh as an argument, returns a float value
+        :returns float:
+        """
+        result = 0
+        edit_mode = context.active_object.mode == "EDIT"
+        for obj in objs:
+            if edit_mode:
+                bm = bmesh.from_edit_mesh(obj.data)
+                result += operation(bm)
+            else:
+                bm = bmesh.new()
+                bm.from_mesh(obj.data)
+                result += operation(bm)
+                bm.free()
+        return result
 
 
 def calculate_formwork_area(objs, context):
@@ -49,10 +75,11 @@ def calculate_formwork_area(objs, context):
         context.collection.objects.link(new_obj)
         copied_objs.append(new_obj)
 
-    context_override = {}
-    context_override["object"] = context_override["active_object"] = copied_objs[0]
-    context_override["selected_objects"] = context_override["selected_editable_objects"] = copied_objs
-    bpy.ops.object.join(context_override)
+    if len(objs) > 1:
+        context_override = {}
+        context_override["object"] = context_override["active_object"] = copied_objs[0]
+        context_override["selected_objects"] = context_override["selected_editable_objects"] = copied_objs
+        bpy.ops.object.join(context_override)
 
     copied_objs[0].name = "Formwork"
     copied_objs[0].BIMObjectProperties.ifc_definition_id = 0
diff --git a/src/blenderbim/blenderbim/bim/module/qto/operator.py b/src/blenderbim/blenderbim/bim/module/qto/operator.py
index b77d067e14..de4b968764 100644
--- a/src/blenderbim/blenderbim/bim/module/qto/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/qto/operator.py
@@ -18,7 +18,6 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
-import bmesh
 import ifcopenshell
 import ifcopenshell.api
 from blenderbim.bim.ifc import IfcStore
@@ -31,14 +30,12 @@ class CalculateEdgeLengths(bpy.types.Operator):
     bl_label = "Calculate Edge Lengths"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects and context.active_object
+
     def execute(self, context):
-        result = 0
-        for obj in context.selected_objects:
-            if not obj.data or not obj.data.edges:
-                continue
-            for edge in obj.data.edges:
-                if edge.select:
-                    result += (obj.data.vertices[edge.vertices[1]].co - obj.data.vertices[edge.vertices[0]].co).length
+        result = helper.calculate_edges_lengths([o for o in context.selected_objects if o.type == "MESH"], context)
         context.scene.BIMQtoProperties.qto_result = str(round(result, 3))
         return {"FINISHED"}
 
@@ -48,14 +45,12 @@ class CalculateFaceAreas(bpy.types.Operator):
     bl_label = "Calculate Face Areas"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects and context.active_object
+
     def execute(self, context):
-        result = 0
-        for obj in context.selected_objects:
-            if not obj.data or not obj.data.polygons:
-                continue
-            for polygon in obj.data.polygons:
-                if polygon.select:
-                    result += polygon.area
+        result = helper.calculate_faces_areas([o for o in context.selected_objects if o.type == "MESH"], context)
         context.scene.BIMQtoProperties.qto_result = str(round(result, 3))
         return {"FINISHED"}
 
@@ -65,15 +60,12 @@ class CalculateObjectVolumes(bpy.types.Operator):
     bl_label = "Calculate Object Volumes"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects and context.active_object
+
     def execute(self, context):
-        result = 0
-        for obj in context.selected_objects:
-            if not obj.data or not isinstance(obj.data, bpy.types.Mesh):
-                continue
-            bm = bmesh.new()
-            bm.from_mesh(obj.data)
-            result += bm.calc_volume()
-            bm.free()
+        result = helper.calculate_volumes([o for o in context.selected_objects if o.type == "MESH"], context)
         context.scene.BIMQtoProperties.qto_result = str(round(result, 3))
         return {"FINISHED"}
 
@@ -83,17 +75,21 @@ class ExecuteQtoMethod(bpy.types.Operator):
     bl_label = "Execute Qto Method"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
+        selected_mesh_objects = [o for o in context.selected_objects if o.type == "MESH"]
         props = context.scene.BIMQtoProperties
         result = 0
         if props.qto_methods == "HEIGHT":
-            for obj in context.selected_objects:
+            for obj in selected_mesh_objects:
                 result += helper.calculate_height(obj)
         elif props.qto_methods == "VOLUME":
-            for obj in context.selected_objects:
-                result += helper.calculate_volume(obj)
+            result = helper.calculate_volumes(selected_mesh_objects, context)
         elif props.qto_methods == "FORMWORK":
-            result = helper.calculate_formwork_area(context.selected_objects, context)
+            result = helper.calculate_formwork_area(selected_mesh_objects, context)
         props.qto_result = str(round(result, 3))
         return {"FINISHED"}
 
@@ -103,20 +99,24 @@ class QuantifyObjects(bpy.types.Operator):
     bl_label = "Quantify Objects"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return IfcStore.get_file() and context.selected_objects
+
     def execute(self, context):
         return IfcStore.execute_ifc_operator(self, context)
 
     def _execute(self, context):
         props = context.scene.BIMQtoProperties
         self.file = IfcStore.get_file()
-        for obj in context.selected_objects:
+        for obj in (o for o in context.selected_objects if o.type == "MESH"):
             if not obj.BIMObjectProperties.ifc_definition_id:
                 continue
             result = 0
             if props.qto_methods == "HEIGHT":
                 result = helper.calculate_height(obj)
             elif props.qto_methods == "VOLUME":
-                result = helper.calculate_volume(obj)
+                result = helper.calculate_volumes([obj], context)
             elif props.qto_methods == "FORMWORK":
                 result = helper.calculate_formwork_area([obj], context)
             if not result:
diff --git a/src/blenderbim/blenderbim/bim/operator.py b/src/blenderbim/blenderbim/bim/operator.py
index fccaab384a..14cf470a42 100644
--- a/src/blenderbim/blenderbim/bim/operator.py
+++ b/src/blenderbim/blenderbim/bim/operator.py
@@ -411,11 +411,13 @@ class RemoveSectionPlane(bpy.types.Operator):
     bl_label = "Remove Temporary Section Cutaway"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.active_object and bpy.data.node_groups.get("Section Override")
+
     def execute(self, context):
         name = context.active_object.name
         section_override = bpy.data.node_groups.get("Section Override")
-        if not section_override:
-            return {"FINISHED"}
         for node in section_override.nodes:
             if node.type != "TEX_COORD" or node.object.name != name:
                 continue
@@ -497,8 +499,11 @@ class SetOverrideColour(bpy.types.Operator):
     bl_label = "Set Override Colour"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
-        result = 0
         for obj in context.selected_objects:
             obj.color = context.scene.BIMProperties.override_colour
         area = next(area for area in context.screen.areas if area.type == "VIEW_3D")
@@ -511,6 +516,10 @@ class SetViewportShadowFromSun(bpy.types.Operator):
     bl_label = "Set Viewport Shadow from Sun"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.active_object
+
     def execute(self, context):
         # The vector used for the light direction is a bit funny
         mat = Matrix(((-1.0, 0.0, 0.0, 0.0), (0.0, 0, 1.0, 0.0), (-0.0, -1.0, 0, 0.0), (0.0, 0.0, 0.0, 1.0)))
@@ -553,17 +562,20 @@ class SnapSpacesTogether(bpy.types.Operator):
     bl_label = "Snap Spaces Together"
     bl_options = {"REGISTER", "UNDO"}
 
+    @classmethod
+    def poll(cls, context):
+        return context.selected_objects
+
     def execute(self, context):
         threshold = 0.5
         processed_polygons = set()
-        for obj in context.selected_objects:
-            if obj.type != "MESH":
-                continue
+        selected_mesh_objects = [o for o in context.selected_objects if o.type == "MESH"]
+        for obj in selected_mesh_objects:
             for polygon in obj.data.polygons:
                 center = obj.matrix_world @ polygon.center
                 distance = None
-                for obj2 in context.selected_objects:
-                    if obj2 == obj or obj.type != "MESH":
+                for obj2 in selected_mesh_objects:
+                    if obj2 == obj:
                         continue
                     result = obj2.ray_cast(obj2.matrix_world.inverted() @ center, polygon.normal, distance=threshold)
                     if not result[0]:
diff --git a/src/ifcpatch/ifcpatch/__init__.py b/src/ifcpatch/ifcpatch/__init__.py
index b9e9166d66..74f38c36dd 100644
--- a/src/ifcpatch/ifcpatch/__init__.py
+++ b/src/ifcpatch/ifcpatch/__init__.py
@@ -63,8 +63,7 @@ def extract_docs(
     method_name: str="__init__",
     boilerplate_args : typing.Iterable[str]=None):
     """Extract class docstrings and method arguments
-    
-    :param module: Parent module from which to extract the submodule class
+
     :param submodule_name: Submodule from which to extract the class
     :param cls_name: Class from which to extract the docstring and method arguments
     :param method_name: Class Method name from which to extract arguments