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Last Reviewed: December 13, 2022


Learn how to migrate a site that's hosted on another platform.

This guide will show you how to migrate a Drupal Composer-managed site currently hosted outside of Pantheon to a Drupal Composer-managed site on Pantheon. If you to want upgrade to the latest version of Drupal, use Migrate a Composer Managed Drupal Site from Another Platforminstead.


This upgrade migrates your existing site to a new site. The new site will not maintain your site’s commit history.

This doc uses the following aliases:

  • Alias: SITE
  • Old site folder FORMER-PLATFORM


  • You have access to a local copy of the existing site and/or you have access to a Git repository of the existing site.

  • Your site is based on the drupal/recommended-project template or a similar non-composer managed structure.