diff --git a/src/blenderbim/blenderbim/bim/module/cost/__init__.py b/src/blenderbim/blenderbim/bim/module/cost/__init__.py
index 08a6dbea48..49c7199d9f 100644
--- a/src/blenderbim/blenderbim/bim/module/cost/__init__.py
+++ b/src/blenderbim/blenderbim/bim/module/cost/__init__.py
@@ -68,6 +68,7 @@ classes = (
     operator.ContractCostItemRate,
     operator.CalculateCostItemResourceValue,
     operator.ClearCostItemAssignments,
+    operator.SelectUnassignedProducts,
     operator.LoadCostItemElementQuantities,
     operator.LoadCostItemTaskQuantities,
     operator.LoadCostItemResourceQuantities,
diff --git a/src/blenderbim/blenderbim/bim/module/cost/operator.py b/src/blenderbim/blenderbim/bim/module/cost/operator.py
index baf7112f81..b25b653b13 100644
--- a/src/blenderbim/blenderbim/bim/module/cost/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/cost/operator.py
@@ -652,3 +652,13 @@ class ClearCostItemAssignments(bpy.types.Operator, tool.Ifc.Operator):
             related_object_type=self.related_object_type,
         )
         return {"FINISHED"}
+
+
+class SelectUnassignedProducts(bpy.types.Operator):
+    bl_idname = "bim.select_unassigned_products"
+    bl_label = "Select Unassigned Products"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        core.select_unassigned_products(tool.Ifc, tool.Cost, tool.Spatial)
+        return {"FINISHED"}
diff --git a/src/blenderbim/blenderbim/core/cost.py b/src/blenderbim/blenderbim/core/cost.py
index 995d38b711..454376a549 100644
--- a/src/blenderbim/blenderbim/core/cost.py
+++ b/src/blenderbim/blenderbim/core/cost.py
@@ -240,3 +240,10 @@ def clear_cost_item_assignments(ifc, cost, cost_item, related_object_type):
         ifc.run("cost.unassign_cost_item_quantity", cost_item=cost_item, products=products)
     cost.load_cost_item_quantity_assignments(cost_item, related_object_type=related_object_type)
     cost.load_cost_schedule_tree()
+
+def select_unassigned_products(ifc, cost, spatial):
+    spatial.deselect_all()
+    products = ifc.get().by_type("IfcElement")
+    cost_schedule = cost.get_active_cost_schedule()
+    selection = [product for product in products if not cost.has_cost_assignments(product, cost_schedule)]
+    spatial.select_products(selection)
diff --git a/src/blenderbim/blenderbim/core/tool.py b/src/blenderbim/blenderbim/core/tool.py
index cbfa2ccd52..3aaf2b0419 100644
--- a/src/blenderbim/blenderbim/core/tool.py
+++ b/src/blenderbim/blenderbim/core/tool.py
@@ -160,7 +160,7 @@ class Cost:
     def expand_cost_items(cls): pass
     def export_cost_schedules(cls, format): pass
     def get_active_cost_item(cls): pass
-    def get_all_nested_cost_items(cls, cost_item): pass
+    def get_active_cost_schedule(cls): pass
     def get_attributes_for_cost_value(cls, cost_type, cost_category): pass
     def get_cost_item_attributes(cls, cost_item): pass
     def get_cost_item_products(cls): pass
@@ -172,11 +172,13 @@ class Cost:
     def get_cost_value_unit_component(cls): pass
     def get_direct_cost_item_products(cls): pass
     def get_highlighted_cost_item(cls): pass
+    def get_highlighted_cost_item(cls): pass
     def get_nested_cost_items(cls, cost_item): pass
     def get_products(cls, related_object_type): pass
     def get_root_cost_items(cls, cost_schedule): pass
     def get_schedule_cost_items(cls, cost_schedule): pass
     def get_units(cls):pass
+    def has_cost_assignments(cls, cost_item): pass
     def import_cost_schedule_csv(cls, file_path, is_schedule_of_rates): pass
     def is_active_schedule_of_rates(cls): pass
     def load_cost_item_attributes(cls): pass
diff --git a/src/blenderbim/blenderbim/tool/cost.py b/src/blenderbim/blenderbim/tool/cost.py
index 7a9138ff3a..989c73a714 100644
--- a/src/blenderbim/blenderbim/tool/cost.py
+++ b/src/blenderbim/blenderbim/tool/cost.py
@@ -542,3 +542,18 @@ class Cost(blenderbim.core.tool.Cost):
             if unit.get_info().get("Prefix", None):
                 name = f"{unit.Prefix} {name}"
             return f"{unit.UnitType} / {name}"
+
+    @classmethod
+    def get_active_cost_schedule(cls):
+        if not bpy.context.scene.BIMCostProperties.active_cost_schedule_id:
+            return None
+        return tool.Ifc.get().by_id(bpy.context.scene.BIMCostProperties.active_cost_schedule_id)
+
+    @classmethod
+    def has_cost_assignments(cls, product, cost_schedule=None):
+        cost_items = ifcopenshell.util.cost.get_cost_items_for_product(product)
+        if cost_schedule:
+            cost_items = [
+                cost_item for cost_item in cost_items or [] if cls.get_cost_schedule(cost_item) == cost_schedule
+            ]
+        return bool(cost_items)