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Choosing between a block theme and a classic theme is not about fashion — it decides who can edit the site, how fast it loads, and how expensive the next redesign will be. Here is the decision process used on real projects.
The five questions that decide it
- Who edits content? If non-developers must own layouts, block themes with reusable patterns win — editing happens in Gutenberg, not in page-builder overlays.
- How complex are the templates? Block themes handle most business sites comfortably. Very dynamic templates with heavy conditional logic can favor classic PHP, though modern block themes with server-side rendered blocks cover far more than they used to.
- What is the update story? Design in theme.json and patterns is versioned in code; design in a builder’s overlay database is not. The first survives migrations cleanly.
- How heavy is the current site? A block theme with a CSS budget loads tens of kilobytes. Most commercial multipurpose themes ship hundreds.
- What does the next developer inherit? A block theme is standard WordPress. A builder stack is a proprietary layer — fine while it is supported, expensive when it is not.
When a classic theme is still right
Large legacy codebases with years of PHP template logic, unusual third-party integrations, or editorial workflows built around the classic editor can justify staying classic for a while. The mistake is choosing the heavier option by default.
The middle path
Many “block theme vs classic” debates are really about editability. A custom block theme with well-designed patterns gives your team the control of a builder at a fraction of the weight — this website is one, and it demonstrates the approach. To discuss what a custom theme would involve for your site, read about WordPress theme development or get in touch.
Common questions
Do block themes require the Gutenberg plugin?
No. Block themes run on the block editor that ships with WordPress core; the Gutenberg plugin is only useful for testing features before they land in a WordPress release.
Can an existing classic theme be converted?
Technically yes, but the honest answer is usually a rebuild on the block system, carrying over design tokens and templates one at a time. A heavily customized classic theme rarely converts for less than a fresh build costs.
Do block themes slow down the editor?
The opposite, in most cases. The editor renders the same blocks the front end does, so there is no parallel page-builder layer to load and no lock-in to maintain.
