Common Migration Mistakes
Site migrations are complex projects with many moving parts. SEO problems during migrations often follow recognizable patterns. Understanding these patterns in advance can help teams avoid them.
Redirecting all old URLs to the homepage
This is one of the most common patterns in smaller migrations. When a team cannot produce a full URL-to-URL redirect map in time, they configure a catch-all rule that sends all 404s to the homepage. It looks clean in the browser. Google does not treat it the same way.
A homepage redirect tells Google that the old page no longer exists in any meaningful form. The ranking equity associated with that URL is not transferred to the homepage. It is effectively abandoned. For sites where individual pages carry significant search visibility, this approach will produce ranking losses that take time and deliberate action to recover from.
What to do instead
Build a URL-to-URL redirect map that sends each old page to its closest equivalent on the new site. When a direct equivalent does not exist, find the most topically relevant destination available. The homepage is a last resort, used only when no relevant destination exists.
Forgetting to update internal links after launch
A redirect map handles external links and bookmarks. It does not handle internal links. If the new site's content still contains links pointing to the old URL structure, every internal link is now resolved through a redirect rather than pointing directly to the correct destination.
This creates unnecessary redirect hops, increases page load time marginally, and can cause confusion in Googlebot's crawl. More importantly, it means the redirect layer is now doing work it should not need to do internally.
What to do instead
After migration, run a crawl of the new site and identify all internal links that still resolve through a redirect. Update those links to point directly to the final destination URL. This is a standard post-migration cleanup task that is often skipped because the redirects are working and the problem is not immediately visible.
Missing the robots.txt or noindex on the staging environment
Development and staging environments commonly use a robots.txt disallow or a noindex directive to prevent search engines from crawling the pre-launch version of the site. This is correct practice. The problem occurs when those blocks are not removed before launch, or when the production environment is accidentally launched with a staging configuration.
A site-wide noindex directive blocks the entire site from appearing in search results. This situation can exist for days before anyone notices, particularly if the team is focused on other launch issues.
What to do instead
Include robots.txt and noindex verification as an explicit item on the launch day checklist. Check the robots.txt file directly on the live domain after launch. Check a sample of pages for noindex meta tags. Confirm in Search Console that the site is not blocked from crawling. These are quick checks that prevent a specific and serious problem.
Changing URL structure and domain simultaneously
Each type of migration carries its own ranking risk. A domain change is one type. A URL structure change is another. When both happen at the same time, the compounded uncertainty makes it harder to diagnose problems and harder for Google to re-establish confidence in the site's structure.
This combination is sometimes unavoidable, particularly in rebranding projects. When it is avoidable, separating the changes into sequential steps reduces the risk at each stage.
What to do instead
When possible, move the domain first with the existing URL structure intact, then restructure URLs in a separate subsequent migration. Each change can be monitored independently, and problems can be attributed more clearly.
Not establishing a pre-migration baseline
Without a documented snapshot of which pages rank for which queries before the migration, it is difficult to assess what changed after launch. Teams often recognize that rankings have changed but cannot identify which specific pages were affected or what the pre-migration position was.
This matters for recovery. If you cannot identify which pages lost rankings and from what position, prioritizing recovery work becomes guesswork.
What to do instead
Export ranking data for the top pages and queries before the migration. Download a Search Console performance report covering at least the previous 90 days. Document which pages receive the most organic traffic. This baseline allows post-migration monitoring to identify changes with specificity rather than in aggregate.
Removing or consolidating content without a strategy
Migrations often trigger content audits. Pages that seemed redundant get removed. Similar topics get merged. This is frequently a sensible editorial decision. It becomes a problem when pages with existing search visibility are removed without redirecting to a relevant destination, or when content is merged in ways that inadvertently dilute topical signals.
What to do instead
Cross-reference any content removal or consolidation decisions against organic traffic data before acting. Pages with measurable organic traffic should receive careful consideration before removal. When content is merged, ensure the destination page adequately covers the topics of both source pages.
Treating migration as complete on launch day
Launch day is the beginning of the migration process from Google's perspective, not the end. Googlebot needs time to discover, crawl, and re-evaluate the new structure. Indexing anomalies often surface in the weeks after launch, not during it. Redirect issues that were not apparent in staging can appear in production at scale.
Teams that close out the migration immediately after launch miss the window where monitoring is most valuable.
What to do instead
Schedule monitoring checkpoints at one week, four weeks, and twelve weeks after launch. Track indexing coverage in Search Console. Monitor ranking movement for high-priority pages. Watch crawl error reports. The monitoring window is as important as the pre-launch preparation.
These patterns are preventable
The migration mistakes described on this page appear across projects of different sizes and types. They share a common characteristic: each one is easier to prevent than to correct after the fact. A structured approach to migration SEO addresses these patterns systematically before they affect search performance.
View Engagement OptionsHave a migration coming up?
Describing your project takes a few minutes. We can respond with an initial assessment of the SEO considerations involved.
Get in Touch