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

Discuss in our Forum Discuss in Slack

This guide will show you how to migrate a Composer site currently hosted outside of Pantheon to Pantheon.

Current Host

How Site Was Created

Additional Requirements

If this is not your scenario, see Drupal Migration Guides for additional upgrade paths.


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.