diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 92ef52a5d..528bcd52e 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -25,5 +25,5 @@
 | Pierre-siddall   | Pierre Siddall         | Met Office  | 2026-01-29 |
 | mo-lucy-gordon   | Lucy Gordon            | Met Office  | 2026-03-18 |
 | shreybh1         | Shrey Bhardwaj         | Met Office  | 2026-03-26 |
-
+| mattatmet        | Matthew Walker         | Met Office  | 2026-04-21 |
 
diff --git a/infrastructure/build/psyclone/psyclone_tools.py b/infrastructure/build/psyclone/psyclone_tools.py
index 14060c3e2..829733e90 100644
--- a/infrastructure/build/psyclone/psyclone_tools.py
+++ b/infrastructure/build/psyclone/psyclone_tools.py
@@ -13,20 +13,32 @@
 
 from psyclone.domain.lfric import LFRicConstants
 from psyclone.psyGen import InvokeSchedule
-from psyclone.psyir.nodes import Loop, Routine, Directive
+from psyclone.psyir.nodes import (
+    Loop, 
+    Routine, 
+    Directive, 
+    Container, 
+    OMPParallelDirective,
+    OMPParallelDoDirective,
+    OMPDoDirective,
+    FileContainer,
+    ProfileNode
+)
 from psyclone.transformations import (
     Dynamo0p3ColourTrans,
     Dynamo0p3OMPLoopTrans,
     Dynamo0p3RedundantComputationTrans,
     OMPParallelTrans,
+    TransformationError
 )
+from psyclone.psyir.transformations import ProfileTrans
 
 # List of allowed 'setval_*' built-ins for redundant computation transformation
 SETVAL_BUILTINS = ["setval_c"]
 
 
 # -----------------------------------------------------------------------------
-def redundant_computation_setval(psyir):
+def redundant_computation_setval(psyir: FileContainer):
     """
     Applies the redundant computation transformation to loops over DoFs
     for the initialision built-ins, 'setval_*'.
@@ -68,13 +80,14 @@ def redundant_computation_setval(psyir):
 
 
 # -----------------------------------------------------------------------------
-def colour_loops(psyir, enable_tiling=False):
+def colour_loops(psyir: FileContainer, enable_tiling=False):
     """
     Applies the colouring transformation to all applicable loops and optionally
     enables tiling.
     It creates the instance of `Dynamo0p3ColourTrans` only once.
 
     :param psyir: the PSyIR of the PSy-layer.
+    :param enable_tiling: a bool to enable tiling. Default False.
     :type psyir: :py:class:`psyclone.psyir.nodes.FileContainer`
 
     """
@@ -86,6 +99,12 @@ def colour_loops(psyir, enable_tiling=False):
         # Colour loops over cells unless they are on discontinuous
         # spaces or over DoFs
         for child in subroutine.children:
+            # Check if the profiling calipers have been added before the 
+            # colouring.
+            if isinstance(child, ProfileNode):
+                raise TransformationError(
+                "Must apply colour_loops BEFORE profile_loops function "
+                "in optimisation script.")
             if (
                 isinstance(child, Loop)
                 and child.iteration_space.endswith("cell_column")
@@ -94,9 +113,59 @@ def colour_loops(psyir, enable_tiling=False):
             ):
                 ctrans.apply(child, options={"tiling": enable_tiling})
 
+# -----------------------------------------------------------------------------
+def profile_loops(psyir: FileContainer, colours_only=True):
+    """
+    Applies timing calipers to kernels during the psyclone build. The default
+    is to only profile coloured loops but colours_only can be set to False to
+    profile every instance of a coded kernel.
+
+    :param psyir: the PSyIR of the PSy-layer.
+    :param colours_only: profile only the coloured kernels. Default True.
+    :type psyir: :py:class:`psyclone.psyir.nodes.FileContainer`
+
+    """
+    profile_trans = ProfileTrans()
+    leave_loops = ["cells_in_colour",
+                   "tiles_in_colour",
+                   "cells_in_tile"]
+
+    # Loop over all the InvokeSchedule in the PSyIR object
+    for subroutine in psyir.walk(InvokeSchedule):
+        # Add timing calipers to coloured loops. This should be done
+        # before the application of the openmp transformation.
+        count = 0
+        for loop in subroutine.loops():
+            if not loop.coded_kernels():
+                continue
+            # Insert profiler calls before loop over colours
+            if ((loop.loop_type == "colours") or 
+                (colours_only is False and loop.loop_type not in leave_loops)):
+                # First check that the transformation is not being made inside 
+                # an OMP region.
+                if (loop.ancestor(OMPParallelDirective) 
+                    or loop.ancestor(OMPParallelDoDirective)
+                    or loop.ancestor(OMPDoDirective)):
+                    raise TransformationError(
+                        "Must apply profile_loops BEFORE "
+                        "openmp_parallelise_loops function in optimisation "
+                        "script.")
+                # Constructing unique calliper name based on kernel name,
+                # invoke name and kernel count
+                k_object = loop.ancestor(InvokeSchedule).coded_kernels()[count]
+                k_name = k_object.name
+                invoke_name = loop.ancestor(InvokeSchedule).invoke.name
+                file_name = loop.ancestor(Container).name
+                # Make region name
+                region_name = invoke_name + ":" + k_name + "_k"  + str(count)
+                options = {"region_name": (file_name, region_name)}
+                profile_trans.apply(loop, options=options)
+                # Count here is to distinguish kernels of the same name
+                # in the same invoke.
+                count += 1
 
 # -----------------------------------------------------------------------------
-def openmp_parallelise_loops(psyir):
+def openmp_parallelise_loops(psyir: FileContainer):
     """
     Applies OpenMP Loop transformation to each applicable loop.
 
@@ -120,7 +189,7 @@ def openmp_parallelise_loops(psyir):
 
 
 # -----------------------------------------------------------------------------
-def view_transformed_schedule(psyir):
+def view_transformed_schedule(psyir: FileContainer):
     """
     Provides view of transformed Invoke schedule in the PSy-layer.