Tutorials

Details

Written by: Bjørn Ove Bremnes

Parent Category: Tutorials - Basic Tutorials

Category: Tutorials - Basic Tutorials - Overrides

Published: 26 July 2026

• Joomla 6
• Cassiopeia
• Joomla Overrides
• Child Templates
• Joomla 5
• Template Customization
• Category Blog
• Module Overrides

A Joomla template override lets you change the HTML and PHP used to present an article, Category Blog item, module, or reusable layout without editing the corresponding component or module source file. That separation prevents an ordinary core-extension update from directly replacing your customized copy. It does not, however, guarantee that the customization will remain compatible with every future update.

This tutorial explains the inheritance and override model before walking through current examples for Cassiopeia on Joomla 6.1 and Joomla 5.4. You will learn where current article, Category Blog, Latest Articles module, and reusable layout files belong; why old Joomla 3 paths are wrong for this work; how to create overrides through the administrator or manually; and how to review them after updates. The objective is not merely to make an override work today. It is to keep the customization small, testable, reversible, and practical to maintain.

Read more: How to Create a Joomla Template Override Without Breaking Updates