Adding BLT to an existing project

Adding BLT to an existing project can be much more complex than simply creating a new site with BLT. There are a few reasons for this:

  1. BLT expects your project to have a particular directory structure and set of files.
  2. You may have to resolve conflicts between your existing dependencies and BLT's dependencies.


  1. Ensure that your project directory structure is Acquia-cloud compatible by asserting that the Drupal root is in a top-level folder called docroot.
  2. You must already user Composer to manage site dependencies. If you don't, please see Using Composer to manage Drupal site dependencies and modify your project accordingly.
  3. Ensure that your dependencies are all up to date via composer update. Assert that these updates do not break your project.

To add BLT to a pre-existing Drupal project, do the following:

  1. cd into your existing project directory.
  2. Add BLT via composer:

    composer require acquia/blt:^8.3 --no-update
    composer update
  3. Continue following instructions for step 2 and beyond in Creating a new project with BLT.