diff --git a/pyproject.toml b/pyproject.toml
index b34fcf9aeb..50c136e352 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,6 +41,7 @@ dependencies = [
     "posthog",
     "pyyaml",
     "platformdirs",
+    "deprecation"
 ]
 
 [project.urls]
@@ -231,7 +232,7 @@ filterwarnings = [
     'ignore:unclosed \<socket.socket:ResourceWarning',
     'ignore:unclosed event loop \<:ResourceWarning',
     # ignore warnings generated while running tests
-    "ignore::DeprecationWarning",
+    #"ignore::DeprecationWarning",
     "ignore::UserWarning",
     "ignore::RuntimeWarning",
 ]
diff --git a/src/pybamm/expression_tree/symbol.py b/src/pybamm/expression_tree/symbol.py
index 3f695b768e..5c25030a09 100644
--- a/src/pybamm/expression_tree/symbol.py
+++ b/src/pybamm/expression_tree/symbol.py
@@ -15,6 +15,7 @@
 import pybamm
 from pybamm.util import import_optional_dependency
 from pybamm.expression_tree.printing.print_name import prettify_print_name
+from deprecation import deprecated
 
 if TYPE_CHECKING:  # pragma: no cover
     import casadi
@@ -356,6 +357,12 @@ def domain(self, domain):
         )
 
     @property
+    @deprecated(
+        deprecated_in="25.1.0",
+        removed_in="26.0.0",
+        current_version=pybamm.__version__,
+        details="Use `symbol.domains` instead.",
+    )
     def auxiliary_domains(self):
         """Returns auxiliary domains."""
         raise NotImplementedError(
@@ -994,6 +1001,12 @@ def create_copy(
         children = self._children_for_copying(new_children)
         return self.__class__(self.name, children, domains=self.domains)
 
+    @deprecated(
+        deprecated_in="25.1.0",
+        removed_in="26.0.0",
+        current_version=pybamm.__version__,
+        details="Use `create_copy` instead.",
+    )
     def new_copy(
         self,
         new_children: list[Symbol] | None = None,
diff --git a/src/pybamm/simulation.py b/src/pybamm/simulation.py
index cf84755e77..fc0c57e364 100644
--- a/src/pybamm/simulation.py
+++ b/src/pybamm/simulation.py
@@ -8,7 +8,7 @@
 from datetime import timedelta
 import pybamm.telemetry
 from pybamm.util import import_optional_dependency
-
+from deprecation import deprecated
 from pybamm.expression_tree.operations.serialise import Serialise
 
 
@@ -171,9 +171,13 @@ def _set_random_seed(self):
                 % (2**32)
             )
 
+    @deprecated(
+        deprecated_in="25.1.0",
+        removed_in="26.0.0",
+        current_version=pybamm.__version__,
+        details="pybamm.simulation.set_up_and_parameterise_experiment is deprecated and not meant to be accessed by users.",
+    )
     def set_up_and_parameterise_experiment(self, solve_kwargs=None):
-        msg = "pybamm.simulation.set_up_and_parameterise_experiment is deprecated and not meant to be accessed by users."
-        warnings.warn(msg, DeprecationWarning, stacklevel=2)
         self._set_up_and_parameterise_experiment(solve_kwargs=solve_kwargs)
 
     def _set_up_and_parameterise_experiment(self, solve_kwargs=None):
@@ -254,11 +258,13 @@ def _set_up_and_parameterise_experiment(self, solve_kwargs=None):
                 parameterised_model
             )
 
+    @deprecated(
+        deprecated_in="25.1.0",
+        removed_in="26.0.0",
+        current_version=pybamm.__version__,
+        details="pybamm.set_parameters is deprecated and not meant to be accessed by users.",
+    )
     def set_parameters(self):
-        msg = (
-            "pybamm.set_parameters is deprecated and not meant to be accessed by users."
-        )
-        warnings.warn(msg, DeprecationWarning, stacklevel=2)
         self._set_parameters()
 
     def _set_parameters(self):
diff --git a/utils/__init__.py b/utils/__init__.py
new file mode 100644
index 0000000000..ba2f5df0d1
--- /dev/null
+++ b/utils/__init__.py
@@ -0,0 +1 @@
+from deprecation_Decorators import *
diff --git a/utils/deprecation_Decorators.py b/utils/deprecation_Decorators.py
new file mode 100644
index 0000000000..0cd16ce38a
--- /dev/null
+++ b/utils/deprecation_Decorators.py
@@ -0,0 +1,33 @@
+import functools
+import warnings
+
+
+def deprecate_arguments(deprecated_args, deprecated_in, removed_in, current_version):
+    """
+    Custom decorator to deprecate specific function arguments.
+
+    Args:
+        deprecated_args (dict): Dictionary of deprecated argument names with details.
+            Example: {"old_arg": "Use 'new_arg' instead."}
+        deprecated_in (str): Version when the argument was deprecated.
+        removed_in (str): Version when the argument will be removed.
+        current_version (str): Current version of the package/module.
+    """
+
+    def decorator(func):
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            for arg, message in deprecated_args.items():
+                if arg in kwargs:
+                    warnings.warn(
+                        f"Argument '{arg}' is deprecated since version {deprecated_in} "
+                        f"and will be removed in version {removed_in}. (Current version: {current_version}) "
+                        f"{message}",
+                        category=DeprecationWarning,
+                        stacklevel=2,
+                    )
+            return func(*args, **kwargs)
+
+        return wrapper
+
+    return decorator