How can you successfully change your domain without losing your SEO rankings?

Why does Google insist on redirecting the homepage?

The homepage redirect serves as the primary signal to Google to understand that an entire domain has migrated. It is not just a simple technical formality; it is the mechanism that triggers the transfer of trust between the two domains in Google's algorithm.

Without this clear root-level redirect, Google treats the two domains as distinct entities. The new domain then starts from scratch in terms of PageRank, history, and accumulated quality signals. This is exactly what we want to avoid during a migration.

What does 'clear redirect' mean in this context?

A clear redirect means a permanent 301 redirect, with no intermediaries or layers of multiple redirects. No temporary 302, no meta refresh, no JavaScript that redirects after loading.

Google must be able to follow the redirect instantly and unambiguously. Each additional step in a redirect chain dilutes the PageRank transfer and slows down the algorithm's recognition of the address change. A direct redirect from old-domain.com to new-domain.com is ideal.

Why shouldn't robots.txt block redirects?

If you block access to a URL in robots.txt, Googlebot cannot crawl it. It will never discover the redirect contained within, even if it is technically in place on the server side.

This is a common mistake during migrations: the old site is set to read-only mode, a restrictive robots.txt is applied out of security reflex, and Google can no longer follow the redirects. The transfer of SEO signals never occurs, or at best with months of delay when someone finally understands the problem.

• The homepage of the old domain MUST redirect in 301 to the homepage of the new domain
• No robots.txt rules should block access to URLs of the old domain
• The address change tool in Search Console ONLY works for domain migrations without structure change
• A migration involving a structure redesign requires a URL-by-URL redirect plan, not just the tool
• 301 redirects must remain active for several months minimum after the migration

Does this guideline really cover all migration cases?

No, and that’s where it gets interesting. Mueller's statement targets simple domain migrations: same site, new domain name, identical URL structure. In this scenario, the address change tool does the bulk of the work.

However, most real migrations combine a domain change AND a redesign of the structure. In these cases, the tool is useless for URL-by-URL mapping. A strategy of individual redirects based on a complete audit of source URLs and precise mapping to target URLs is needed. [To be verified]: Google never provides clear figures on how long to keep these redirects active.

Are there discrepancies between this theory and real-world results?

Yes, frequently. Google claims that 301 redirects transfer PageRank 'almost entirely', but practitioners consistently observe a temporary loss of visibility of 10 to 30% for 2 to 6 months post-migration, even with perfect execution.

Another point: the assertion that the homepage is enough as a migration signal. In reality, if you only redirect the homepage and leave the rest of the old site as 404, you lose most of the accumulated SEO juice on your deeper pages. Mueller's statement is correct but incomplete: it describes the bare minimum, not the optimal strategy.

What risks does this minimalist approach pose?

Relying solely on the address change tool without precisely mapping page-by-page redirects is akin to playing Russian roulette with your organic traffic. URLs generating long-tail traffic that are not individually redirected? Lost.

Backlinks pointing to specific deep pages? Diluted or lost if everything blindly redirects to the homepage. A poorly prepared migration can destroy years of SEO work in a matter of weeks.

What is the technical checklist before launching a domain migration?

Before touching the DNS, you need to map all the strategic URLs of the old site. Extract the complete list from Search Console (indexed URLs) and your analytics tool (traffic-generating URLs). Cross-reference with a full crawl to identify pages with backlinks.

Next, create a redirect mapping: each source URL to its corresponding target URL. No chaining redirects, no redirects to URLs that themselves redirect. Test this mapping in a pre-production environment before deploying it in production.

How can you check that the redirects work correctly after migration?

Use a crawler like Screaming Frog or Oncrawl to track all redirects from the old domain. Ensure that each URL returns a 301 code, not a 302 or a mix of codes. Check that there are no redirect chains (A → B → C) that slow down the PageRank transfer.

On the Search Console side, declare the address change in the dedicated tool AFTER verifying that the homepage redirect works. Monitor coverage and indexing reports to quickly detect any 404 errors or soft 404s that would indicate missing redirects.

How long should redirects remain active?

Google officially recommends keeping redirects active for at least a year. In practice, for a site with a strong SEO history, it is wise to maintain them indefinitely, or at a minimum for 18 to 24 months. The cost of hosting an old domain that only redirects is negligible compared to the risk of losing traffic.

Monitor server logs and Search Console to identify when Googlebot stops crawling the old domain regularly. As long as it visits frequently, the redirects remain actively used for signal transfer. Once crawling becomes anecdotal, you can begin to consider stopping them, but never before a minimum of 12 months.

• Extract the complete list of indexed URLs and traffic-generating URLs from the old site
• Create an accurate URL-by-URL mapping between the old and new domains
• Implement permanent 301 redirects, without chains or intermediaries
• Ensure that robots.txt on the old domain does not prevent crawling of redirects
• Declare the address change in Search Console after technical verification
• Monitor 404 errors and the curve of organic traffic daily for 3 months