Answer
How does custom website design improve SEO?
Custom website design improves SEO by giving you full control over HTML structure, schema.org markup, Core Web Vitals, internal linking, and content architecture — none of which are fully controllable on drag-and-drop builders like Wix or Squarespace.
Six SEO levers a custom build unlocks
Clean semantic HTML, custom JSON-LD schema, Core Web Vitals tuning, image optimization at the source, internal-linking maps, and a content architecture aligned with your target keywords. Templates and builders cap how far you can push each one.
Why builders cap your SEO ceiling
Wix, Squarespace, and most drag-and-drop builders inject extra DOM nodes, ship heavy global JS, and lock layout decisions you cannot override. The result is a Lighthouse ceiling around 50-75 on mobile and limited schema control.