diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f3aa097087de..7086341742f9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -810,6 +810,19 @@ jobs:
         uses: actions/checkout@v7
         with:
           ref: ${{ env.HEAD_COMMIT }}
+      - name: Free up disk space if low
+        # The full suite pulls several DB docker images (mssql alone is ~1.5GB)
+        # Available disk space is not consistent, if we detect low space this cleans up some unused toolchains
+        run: |
+          df -h /
+          avail_kb=$(df -k --output=avail / | tail -1)
+          if [ "$avail_kb" -lt $((40 * 1024 * 1024)) ]; then
+            echo "Low disk space (<40GB free) — reclaiming unused toolchains"
+            sudo rm -rf /usr/local/lib/android /usr/share/dotnet /opt/ghc /usr/local/.ghcup /opt/hostedtoolcache/CodeQL
+            df -h /
+          else
+            echo "Sufficient disk space — skipping cleanup"
+          fi
       - name: Set up Node
         uses: actions/setup-node@v6
         with: