Definition
URL structure refers to how pages are organized and named in a website's address format.
What is URL structure and why does it matter for SEO?
URL structure refers to how pages are organized and named in a website's address format. In a migration, it's a decision about whether to keep existing URLs identical, simplify them, or restructure them to match a new site architecture.
Keeping URLs identical is the simplest way to preserve SEO during a migration - if nothing changes, nothing needs redirecting. But it's not always the right call. Many sites carry years of inconsistent URL patterns, campaign slugs, and legacy folder structures that no longer reflect the site's current content. A migration is a reasonable time to clean that up, as long as every changed URL has a 301 redirect in place.
The riskiest URL changes are to pages with strong backlink profiles and high organic traffic. Those are the pages where a broken or missing redirect causes the most damage.


