diff --git a/src/ifcopenshell-python/ifcopenshell/api/pset/add_pset.py b/src/ifcopenshell-python/ifcopenshell/api/pset/add_pset.py
index db585c3276..f1a99bd847 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/pset/add_pset.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/pset/add_pset.py
@@ -66,6 +66,10 @@ def add_pset(
         like "Pset_WallCommon". If you create your own, you must not use
         that prefix. It is recommended to use your own prefix tailored to
         your project, company, or local government requirement.
+
+        In IFC2X3 should be provided as an empty string for profile properties
+        (they all don't have a name property) and all material properties
+        besides IfcExtendedMaterialProperties.
     :param ifc2x3_subclass: IFC2X3 subclass for material or profile properties.
         In IFC2X3 IfcProfileProperties and IfcMaterialProperties are abstract
         so you need one of their subclasses to instantiate them.
diff --git a/src/ifcopenshell-python/ifcopenshell/util/element.py b/src/ifcopenshell-python/ifcopenshell/util/element.py
index 4f21aa8a98..0643d7480a 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/element.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/element.py
@@ -72,6 +72,7 @@ def get_pset(
     type_pset = None
     ifc_file = element.file
     is_ifc2x3 = ifc_file.schema == "IFC2X3"
+    is_profile = False
 
     if element.is_a("IfcTypeObject"):
         for definition in element.HasPropertySets or []:
@@ -81,14 +82,19 @@ def get_pset(
     elif (
         (is_ifc2x3_material := (is_ifc2x3 and element.is_a("IfcMaterial")))
         or element.is_a("IfcMaterialDefinition")
-        or element.is_a("IfcProfileDef")
+        or (is_profile := element.is_a("IfcProfileDef"))
     ):
         if is_ifc2x3_material:
+            # Support extended props as they do have a name.
             for definition in ifc_file.by_type("IfcExtendedMaterialProperties"):
                 if definition.Material == element and definition.Name == name:
                     pset = definition
                     break
+        elif is_ifc2x3 and is_profile:
+            # Don't support them as they don't have a name.
+            pass
         else:
+            # IfcProfileDef or IfcMaterialDefinition, IFC4+.
             for definition in element.HasProperties or []:
                 if definition.Name == name:
                     pset = definition
@@ -165,6 +171,8 @@ def get_psets(
         qsets = ifcopenshell.util.element.get_psets(element, qtos_only=True)
         psets_and_qtos = ifcopenshell.util.element.get_psets(element)
     """
+    ifc_file = element.file
+    is_ifc2x3 = ifc_file.schema == "IFC2X3"
     psets = {}
     if element.is_a("IfcTypeObject"):
         for definition in element.HasPropertySets or []:
@@ -174,8 +182,22 @@ def get_psets(
                 continue
             psets.setdefault(definition.Name, {}).update(get_property_definition(definition, verbose=verbose))
     # NOTE: doesn't account for IFC2X3 missing HasProperties
-    elif element.is_a("IfcMaterialDefinition") or element.is_a("IfcProfileDef"):
-        for definition in getattr(element, "HasProperties", None) or []:
+    elif (
+        (is_ifc2x3_material := (is_ifc2x3 and element.is_a("IfcMaterial")))
+        or element.is_a("IfcMaterialDefinition")
+        or element.is_a("IfcProfileDef")
+    ):
+        definitions: list[ifcopenshell.entity_instance]
+        if is_ifc2x3:
+            if is_ifc2x3_material:
+                # Only extended props have a name.
+                definitions = [d for d in ifc_file.by_type("IfcExtendedMaterialProperties") if d.Material == element]
+            else:
+                # Ignoring profiles as they don't have names.
+                definitions = []
+        else:
+            definitions = getattr(element, "HasProperties", None) or []
+        for definition in definitions:
             if qtos_only:
                 continue
             psets.setdefault(definition.Name, {}).update(get_property_definition(definition, verbose=verbose))
@@ -247,6 +269,9 @@ def get_property_definition(
     elif ifc_class == "IfcMaterialProperties" or ifc_class == "IfcProfileProperties":
         # 2 IfcExtendedProperties.Properties
         props.update(get_properties(definition[2], verbose=verbose))
+    elif ifc_class == "IfcExtendedMaterialProperties":
+        # 1 IfcExtendedMaterialProperties.ExtendedProperties
+        props.update(get_properties(definition[1], verbose=verbose))
     else:
         # Entity introduced in IFC4
         # definition.is_a('IfcPreDefinedPropertySet'):
diff --git a/src/ifcopenshell-python/test/util/test_element.py b/src/ifcopenshell-python/test/util/test_element.py
index 54e4db0c58..b691620824 100644
--- a/src/ifcopenshell-python/test/util/test_element.py
+++ b/src/ifcopenshell-python/test/util/test_element.py
@@ -41,6 +41,28 @@ import ifcopenshell.util.element as subject
 from ifcopenshell.util.shape_builder import ShapeBuilder
 
 
+class TestIFC2X3MaterialProfilePsts(test.bootstrap.IFC2X3):
+    def test_get_profile_pset(self):
+        profile = ifcopenshell.api.profile.add_parameterized_profile(self.file, "IfcRectangleProfileDef")
+        pset = ifcopenshell.api.pset.add_pset(self.file, profile, "")
+        pset.Perimeter = 25.0
+        # We don't support them, just making sure there are no errors.
+        assert subject.get_pset(profile, "Test") is None
+        assert subject.get_psets(profile) == {}
+
+    def get_material_pset_extended_params(self):
+        material_with_extended_params = ifcopenshell.api.material.add_material(self.file)
+        pset = ifcopenshell.api.pset.add_pset(self.file, material_with_extended_params, "Test")
+        ifcopenshell.api.pset.edit_pset(self.file, pset, "Test", {"GassPressure": 25.0})
+        pset_data = subject.get_pset(material_with_extended_params, "Test")
+        del pset_data["id"]
+        assert pset_data == {"GassPressure": 25.0}
+        psets_data = subject.get_psets(material_with_extended_params)
+        for value in psets_data.values():
+            del value["id"]
+        assert psets_data == {"Test": {"GassPressure": 25.0}}
+
+
 class TestGetPsetIFC4(test.bootstrap.IFC4):
     def test_getting_the_psets_of_a_product_as_a_dictionary(self):
         element = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")