The WordPress child theme vs custom theme decision comes up on almost every WordPress project. The right choice depends on how much design freedom you need, your budget, your team’s technical capability, and how the site will be maintained long-term.
WordPress Child Theme: When to Use It
A child theme is the right choice when an existing premium theme (Astra, GeneratePress, Kadence, OceanWP) already provides 90 percent of what you need. You make visual and functional customisations in the child theme layer without risking your changes being wiped by a parent theme update. Child theme development is faster and cheaper than building from scratch — typically £200–£1,500 for minor to moderate customisation work.
Custom WordPress Theme: When to Use It
A custom theme is justified when: the design is unique enough that no existing theme comes close to the brief, performance requirements make a full custom build worth the investment, the codebase needs to be minimal and controlled by a development team, or the site will integrate tightly with custom post types and complex data structures that make theme inheritance awkward.
What About the Starter Theme Approach?
Many experienced developers use a minimal starter theme (Underscores, WP Rig, or a custom boilerplate) as the foundation of a “custom” theme. This gives the control of a custom build with a faster starting point than writing every file from scratch. It is effectively a custom theme that happens to start from a clean template rather than absolute zero.
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Child theme vs custom theme: frequently asked questions
Is a child theme vs custom theme cheaper?
A child theme is usually cheaper and faster to build because it reuses a parent theme. A custom theme costs more upfront but gives full control over design, speed and code quality.
When does a custom theme win in the child theme vs custom theme debate?
Choose a custom theme when you need a unique design, top performance or complex features. Pick a child theme when you are happy with an existing theme and only need small changes.
Further reading
WordPress documents both approaches in its official Theme Handbook.
