diff --git a/.github/scripts/build-sizer.sh b/.github/scripts/build-sizer.sh
index aac5905..e03be1c 100755
--- a/.github/scripts/build-sizer.sh
+++ b/.github/scripts/build-sizer.sh
@@ -25,8 +25,20 @@ if [[ -f "${openroad_deps_prefixes}" ]]; then
   done
 fi
 
+cmake_compiler_launcher_args=()
+if command -v sccache >/dev/null 2>&1; then
+  echo "sccache detected at $(command -v sccache); enabling CMake compiler launcher"
+  cmake_compiler_launcher_args=(
+    -DCMAKE_C_COMPILER_LAUNCHER=sccache
+    -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
+  )
+else
+  echo "sccache not found on PATH; building without a compiler cache"
+fi
+
 cmake -S . -B build \
   "${cmake_dependency_args[@]}" \
+  "${cmake_compiler_launcher_args[@]}" \
   -DCMAKE_BUILD_TYPE=Release \
   -DENABLE_TESTS=OFF \
   -DUSE_SYSTEM_BOOST=ON \
@@ -40,4 +52,12 @@ cmake -S . -B build \
   -DZLIB_HOME=/usr/lib/x86_64-linux-gnu \
   -DCMAKE_RULE_MESSAGES=OFF
 
+if [[ ${#cmake_compiler_launcher_args[@]} -gt 0 ]]; then
+  if grep -q "sccache" build/src/CMakeFiles/Sizer.dir/build.make; then
+    echo "Verified: generated compile rules invoke sccache"
+  else
+    echo "WARNING: sccache is missing from the generated compile rules" >&2
+  fi
+fi
+
 cmake --build build --target Sizer -j "${NPROC:-$(nproc)}"
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1c5cd6e..035b43a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,6 +18,10 @@ jobs:
   build-linux-x64:
     name: Build Linux x64
     runs-on: ubuntu-22.04
+    env:
+      # sccache-action does not enable the GHA cache backend by itself;
+      # without this, sccache falls back to an ephemeral local-disk cache.
+      SCCACHE_GHA_ENABLED: "true"
     outputs:
       archive-name: ${{ steps.package.outputs.archive-name }}
     steps:
@@ -37,6 +41,10 @@ jobs:
         env:
           SIZER_VERSION: ${{ inputs.version }}
 
+      - name: Show sccache stats
+        if: always()
+        run: "${SCCACHE_PATH:-sccache} --show-stats"
+
       - name: Package Sizer with runtime wrapper
         id: package
         env: