How to Create a Child Theme in WordPress (Step-by-Step)

Creating a child theme in WordPress is one of the most important skills for anyone customizing a WordPress site. It protects your changes from being wiped out during theme updates — and once you understand how it works, it becomes a natural part of any WordPress workflow.

What Is a Child Theme and Why Does It Matter?

A child theme is a theme that inherits the functionality, styling, and templates of another theme — called the parent theme — while allowing you to override or extend any part of it safely.

Here's the core problem it solves: when you modify a theme's files directly and that theme updates, your changes disappear. The update overwrites the original files, including any edits you made. A child theme lives separately from the parent, so updates to the parent leave your customizations untouched.

This applies to everything from small CSS tweaks to full template overrides. Any serious WordPress site customization should run through a child theme.

What You Need Before Starting 🛠️

• A WordPress site with an existing theme installed (this becomes the parent)
• Access to your site files via FTP, a hosting file manager, or your local development environment
• Basic familiarity with WordPress's file structure

You don't need to know PHP deeply to create a basic child theme, but understanding what each file does helps you go further.

The Manual Method: Creating a Child Theme From Scratch

This is the foundational approach. It gives you full control and helps you understand what a child theme actually contains.

Step 1: Create a New Folder for the Child Theme

Navigate to /wp-content/themes/ in your site's file system. Create a new folder with a clear naming convention — typically the parent theme name followed by -child. For example, if the parent theme is twentytwentyfour, name the folder twentytwentyfour-child.

Step 2: Create the style.css File

Inside your new folder, create a file named style.css. This file must contain a specific header comment block that tells WordPress what this theme is and which parent it inherits from: