diff --git a/finalize-locally-mainline-sdk.sh b/finalize-locally-mainline-sdk.sh
new file mode 100755
index 0000000..5285a05
--- /dev/null
+++ b/finalize-locally-mainline-sdk.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -ex
+
+function finalize_locally_mainline_sdk() {
+    local MAINLINE_EXTENSION='6'
+
+    local top="$(dirname "$0")"/../..
+
+    # Bump SDK extension version.
+    "$top/packages/modules/SdkExtensions/gen_sdk/bump_sdk.sh" ${MAINLINE_EXTENSION}
+
+    local version_defaults="$top/build/make/core/version_defaults.mk"
+    sed -i -e "s/PLATFORM_SDK_EXTENSION_VERSION := .*/PLATFORM_SDK_EXTENSION_VERSION := ${MAINLINE_EXTENSION}/g" $version_defaults
+
+    # Build modules SDKs.
+    TARGET_BUILD_VARIANT=userdebug UNBUNDLED_BUILD_SDKS_FROM_SOURCE=true "$top/vendor/google/build/mainline_modules_sdks.sh"
+
+    # Update prebuilts.
+    "$top/packages/modules/common/tools/finalize_sdk.py" -l -b 0 -f ${MAINLINE_EXTENSION} -r '' 0
+}
+
+finalize_locally_mainline_sdk
+