diff --git a/cmake/reports/CMakeLists.txt b/cmake/reports/CMakeLists.txt
index 651e1050e92..4749e8f7446 100644
--- a/cmake/reports/CMakeLists.txt
+++ b/cmake/reports/CMakeLists.txt
@@ -4,6 +4,12 @@ set(flag_for_ram_report ram)
 set(flag_for_rom_report rom)
 set(report_depth 99)
 
+if(DEFINED ZEPHYR_WORKSPACE)
+  set(workspace_arg "--workspace=${ZEPHYR_WORKSPACE}")
+elseif(DEFINED WEST_TOPDIR)
+  set(workspace_arg "--workspace=${WEST_TOPDIR}")
+endif()
+
 foreach(report ram_report rom_report)
   add_custom_target(
     ${report}
@@ -12,6 +18,7 @@ foreach(report ram_report rom_report)
     -k ${ZEPHYR_BINARY_DIR}/${KERNEL_ELF_NAME}
     -z ${ZEPHYR_BASE}
     -o ${CMAKE_BINARY_DIR}
+    ${workspace_arg}
     --json ${CMAKE_BINARY_DIR}/${flag_for_${report}}.json
     -d ${report_depth}
     ${flag_for_${report}}
diff --git a/scripts/footprint/size_report b/scripts/footprint/size_report
index 89e90c85a21..b02812d95de 100755
--- a/scripts/footprint/size_report
+++ b/scripts/footprint/size_report
@@ -565,12 +565,18 @@ def generate_any_tree(symbol_dict, total_size, path_prefix):
         # no need for another level.
         node_zephyr_base = root
         node_output_dir = root
+        node_workspace = root
         node_others = root
     else:
         node_zephyr_base = TreeNode('ZEPHYR_BASE', args.zephyrbase)
         node_output_dir = TreeNode('OUTPUT_DIR', args.output)
         node_others = TreeNode("/", "/")
 
+        if args.workspace:
+            node_workspace = TreeNode('WORKSPACE', args.workspace)
+        else:
+            node_workspace = node_others
+
     # A set of helper function for building a simple tree with a path-like
     # hierarchy.
     def _insert_one_elem(root, path, size):
@@ -593,8 +599,16 @@ def generate_any_tree(symbol_dict, total_size, path_prefix):
                     parent = node
                 node = TreeNode(name=str(part), identifier=cur, size=size, parent=parent)
 
-    zbase = Path(args.zephyrbase)
-    outd = Path(args.output)
+    # Mapping paths to tree nodes
+    path_node_map = [
+        [Path(args.zephyrbase), node_zephyr_base],
+        [Path(args.output), node_output_dir],
+    ]
+
+    if args.workspace:
+        path_node_map.append(
+            [Path(args.workspace), node_workspace]
+        )
 
     for name, sym in symbol_dict.items():
         for symbol in sym:
@@ -602,13 +616,16 @@ def generate_any_tree(symbol_dict, total_size, path_prefix):
             for file in symbol['mapped_files']:
                 path = Path(file, name)
                 if path.is_absolute():
-                    if zbase in path.parents:
-                        path = path.relative_to(zbase)
-                        dest_node = node_zephyr_base
-                    elif outd in path.parents:
-                        path = path.relative_to(outd)
-                        dest_node = node_output_dir
-                    else:
+                    has_node = False
+
+                    for one_path in path_node_map:
+                        if one_path[0] in path.parents:
+                            path = path.relative_to(one_path[0])
+                            dest_node = one_path[1]
+                            has_node = True
+                            break
+
+                    if not has_node:
                         dest_node = node_others
                 else:
                     dest_node = node_no_paths
@@ -632,6 +649,11 @@ def generate_any_tree(symbol_dict, total_size, path_prefix):
             # Only include "others" node if there is something.
             children.append(node_others)
 
+        if args.workspace:
+            node_workspace.size = sum_node_children_size(node_workspace)
+            if node_workspace.height != 0:
+                children.append(node_workspace)
+
         root.children = children
 
     # Root node doesn't have sum of symbol size. So sum them up.
@@ -691,6 +713,8 @@ def parse_args():
                         help="Zephyr base path")
     parser.add_argument("-o", "--output", required=True,
                         help="Output path")
+    parser.add_argument("-w", "--workspace", default=None,
+                        help="Workspace path (Usually the same as WEST_TOPDIR)")
     parser.add_argument("target", choices=['rom', 'ram'])
     parser.add_argument("-d", "--depth", dest="depth",
                         type=int, default=None,