What Usually Breaks During a Domain Migration
A domain migration affects much more than DNS. Redirects, canonicals, internal links, analytics and Search Console all need to move together.
Changing the domain is the easy part
A domain can point to a new website within minutes. A correct migration takes considerably more work.
The risk is not the domain name itself. The risk is breaking the relationships search engines, users, analytics systems and external websites already have with the old URLs.
Google’s own migration guidance recommends preparing URL mappings, using permanent server-side redirects, updating canonicals and internal links, submitting the new sitemap and monitoring both versions of the site.
Redirecting everything to the homepage is not a migration strategy
One of the most damaging shortcuts is redirecting every old URL to the new homepage.
Old product pages, service pages and articles should normally redirect to their closest relevant equivalent. If an old page no longer has a replacement, it may be more appropriate to return a proper 404 or 410 rather than send users somewhere unrelated.
A clean one-to-one URL map also makes the migration easier to test.
Google recommends permanent server-side redirects such as 301 or 308 where possible and advises avoiding unnecessary redirect chains.
Canonicals and internal links need to move too
A migration can look correct to a user while the HTML still refers to the previous domain.
Canonical tags, hreflang where applicable, structured data, internal links, image URLs and sitemap entries should be checked for old-domain references.
If the new page says through its canonical tag that the old URL is still primary, the site is sending contradictory signals.
This is why I do not consider a migration finished immediately after DNS and redirects start working.
Search Console and analytics are part of the migration
Search visibility and measurement need continuity.
For a domain change, both old and new properties should be available in Search Console, and Google provides a Change of Address process specifically for moves between domains or subdomains. The new sitemap should also contain the new URLs.
Analytics and advertising systems need checking as well. Otherwise traffic may appear to disappear simply because tracking configuration did not move correctly.
Do not redesign everything on the same day if you can avoid it
Changing the domain, CMS, URL structure, content and design simultaneously makes troubleshooting much harder.
Google explicitly recommends changing one major thing at a time when possible. A migration already causes search systems to recrawl and process new URLs, so adding multiple unrelated structural changes creates more variables.
For a migration project, boring and controlled is often better than ambitious.
Redirects need to stay in place
Redirects are not something to remove after a few weeks because the new domain “already works.”
Google recommends keeping migration redirects for as long as possible and generally for at least one year so signals and old links have enough time to transfer. From a user perspective, maintaining useful redirects even longer can make sense.
After launch I monitor redirect behaviour, indexing, Search Console reports, traffic and any unexpected 404 errors rather than assuming the migration is complete on day one.
A successful domain migration should feel uneventful to the customer. Achieving that usually requires quite a lot of technical work behind the scenes.
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