This document contains information about a future release and not the current stable version (4). Be aware that information on this page may change and API's may not be stable for production use.


Themes can be used to kick start your SilverStripe projects, can be stored outside of your application code and your application can provide multiple unique themes (i.e a mobile theme).


Head to the themes section of the addons site to check out the range of themes the community has built. Each theme has a page with links you can use to preview and download it. Themes are normally published and downloaded using Composer, but may be available as archive files as well.


Via Composer

If a theme has Composer support you can require it directly through composer.

composer require author/theme_name [version]

Note: [version] should be replaced with a version constraint if you know it, otherwise leave it blank to pull the latest version compatible with your project.

As you've added new files to your SilverStripe installation, make sure you clear the SilverStripe cache by appending ?flush=1 to your website URL (e.g

After installing the files through either method, update the current theme in SilverStripe. This can be done by either altering the SSViewer.themes setting in a config.yml or by changing the current theme in the Site Configuration panel (


    - theme_name
    - '$default'


Unpack the contents of the zip file you download into the themes directory in your SilverStripe installation. The theme should be accessible at themes/theme_name.

Developing your own theme

A theme within SilverStripe is simply a collection of templates and other front end assets such as javascript and CSS located within the themes directory.


SilverStripe 4 has support for cascading themes, which will allow users to define multiple themes for a project. This means you can have a template defined in any theme, and have it continue to look back through the list of themes until a match it found.

To define extra themes simply add extra entries to the SilverStripe\View\SSViewer.themes configuration array. You will probably always want to ensure that you include '$default' in your list of themes to ensure that the base templates are used when required.

Submitting your theme to addons

If you want to submit your theme to the SilverStripe addons directory then check:

  • You should ensure your templates are well structured, modular and commented so it's easy for other people to customise
  • Templates should not contain text inside images and all images provided must be open source and not break any copyright or license laws. This includes any icons your template uses.
  • A theme does not include any PHP files. Only CSS, HTML, images and javascript.
  • Your theme contains a composer.json file specifying the theme name, author and license, and that it has "type": "silverstripe-theme".

Once you've created your module and set up your Composer configuration, create a new repository and push your theme to a Git host such as

The final step is to submit your theme to Packagist (the central Composer package repository). Once your theme is listed in Packagist, and has "type": "silverstripe-theme" in its configuration, it will automatically be pulled into our addons listing site.

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