A CMS migration typically takes a few days for a small site and several weeks to months for a large or complex site. A CMS, or content management system, is the software that holds your pages, media, accounts, and settings. Actual time depends on content volume, custom features, integrations, and whether design changes at the same time. A clear inventory and testing plan shortens the work.
Official resource:
- Review Google's site move and migration checklist — Verify the redirect, canonical, and monitoring steps that determine migration timelines.
Table of Contents
- What makes a migration fast or slow?
- What are the main phases?
- How does the platform choice affect timing?
- How can you keep the project on schedule?
What makes a migration fast or slow?
Page count matters, but structure matters more. Ten simple pages move fast. Hundreds of pages with custom fields, forms, memberships, or multiple languages take longer. Connections to other tools also add time.
Payment systems, customer databases, newsletters, ad tracking, and booking tools each need testing. A move that keeps the same design moves faster than one that rebuilds templates. Content quality is another factor. Clean titles, images, files, and user roles transfer smoothly. Duplicate pages, old plugins, broken files, and unclear permissions require cleanup first.
What are the main phases?
Most projects follow the same order, even when timelines differ. Planning prevents lost pages and broken links.
Testing often takes more time than teams expect. Check menus, internal links, images, downloads, forms, logins, and mobile layouts. Fix problems on a staging copy before the public site changes.
- Audit content, files, users, forms, and connected tools.
- Map old pages to new pages and set redirects.
- Build and test templates, navigation, search, and forms.
- Move content, check formatting, then test again before launch.
How does the platform choice affect timing?
Moving between similar systems is usually simpler. Field types, media handling, and user roles line up more easily. Moving from a simple builder to WordPress or Drupal often adds setup for themes, permissions, and extensions. Drupal projects often need extra care with custom content types, views, and access rules.
WordPress projects often need care with themes, plugins, and form replacements. In both cases, custom code and large media libraries extend the schedule. A content freeze helps at the end. Stop major edits on the old site while final content moves. This avoids copying the same changes twice.
How can you keep the project on schedule?
Assign one owner for content decisions. Delays often come from unclear approvals about what to keep, rewrite, or delete. Decide early which pages matter and which can be archived. Protect traffic and leads during the move.
Keep page addresses where possible. Where addresses change, redirect each old address to the closest new page. After launch, test contact forms, checkout, search, and key landing pages. Watch for these warning signs: Give editors a short walkthrough of publishing, images, menus, and approvals in the new system. Lock content edits before final transfer, then verify counts, links, and files immediately after launch.
- Unknown logins, files, or subsites appear during the audit.
- Key features lack a clear replacement in the new system.
- Redirects, testing, or training have no assigned owner.
