diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..4e20417
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,14 @@
+# This CODEOWNERS file includes a primary codeowner and a deputy for each section.
+# Codeowners who are not in a comment will be automatically notified of changes
+# to the listed files. All codeowners listed are valid points of contact
+# for discussing changes and seeking approval for work.
+
+rose-stem/                              @theabro                # @alanjhewitt
+src/                                    @theabro                # @alanjhewitt
+src/control/glomap_clim                 @alanjhewitt            # @theabro
+src/science/glomap_clim                 @alanjhewitt            # @theabro
+
+# Other areas
+.github/                                @MetOffice/ssdteam
+LICENSE                                 @yaswant
+README.md                               @MetOffice/ssdteam
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index ee3c9fb..fd9e65a 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -12,3 +12,4 @@
 | yaswant           | Yaswant Pradhan     | Met Office                     | 2026-07-17 |
 | RobWatersMet      | Rob Waters          | NCAS & University of Cambridge | 2026-07-06 |
 | alanjhewitt       | Alan J Hewitt       | Met Office                     | 2026-07-12 |
+| t00sa             | Sam Clarke-Green    | Met Office                     | 2026-09-10 |