Block theme, classic theme or page builder after the conversion?
After converting an AI website, the theme architecture decides how easy the site is to edit for years. An IT specialist compares the options.
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A decision with long consequences
When a converter turns an AI-built site into WordPress, it produces pages and a theme. That is the starting point, not the end. Sooner or later someone asks whether the site should become a block theme, stay a classic theme or move into a page builder. The answer shapes how fast you can edit, how fast the site loads and how expensive it is to maintain.
I have worked with all three approaches for many years. None is perfect, but each fits certain teams and certain sites much better than the others.
Block themes
Block themes use the WordPress site editor for everything: headers, footers, templates and pages. Colours, fonts and spacing live in a single theme.json file, which maps nicely onto the design tokens that AI tools generate with Tailwind or shadcn. For a converted AI site this is often the most natural home.
The strengths are speed and future-proofing. Block themes load very little extra code and follow the direction WordPress itself is moving in. The weakness is that some complex layouts still need custom blocks or a bit of CSS, and editors need a short introduction to the site editor.
Classic themes
Classic themes use PHP templates and the customizer. They are well understood by developers and very stable. If the site has a lot of custom logic, such as special archive pages or tight integrations, a classic theme with the block editor for content can be a solid choice.
The downside is that layout changes usually require a developer. For small businesses that want to change their own homepage, that becomes a bottleneck. I mostly recommend classic themes when a technical team maintains the site anyway.
Page builders
Page builders offer drag and drop with many ready-made widgets. Editors love the freedom, and agencies like how quickly they can make changes. For marketing teams that build new landing pages every week, that freedom is valuable.
The price is weight and lock-in. Page builders often add a lot of CSS and JavaScript, which can hurt Core Web Vitals, and their content is stored in a format that is hard to move away from. If you choose one, choose it consciously and keep the number of add-ons small.
How I decide
I ask three questions. Who edits the site every week? How often does the layout change? Who pays for maintenance? A small team that edits text and adds blog posts does best with a block theme. A developer-maintained site with complex logic fits a classic theme. A marketing team that lives in campaigns may justify a page builder.
Whatever you choose, keep the design tokens in one place, build reusable patterns for common sections and document them. That turns a converted AI design into a real system instead of a collection of one-off pages.
Migrating step by step
You do not have to rebuild everything at once. Start with the converted theme, fix the small glitches that are normal after any conversion, and launch. Then move templates to the chosen architecture one by one, starting with the pages that change most often.
Measure loading speed before and after each step. If a change makes the site slower, you will notice it immediately and can adjust before it becomes a habit.