Website Migration Checklist: Change Host or Domain Without Losing SEO

Migrations are where hard-won rankings go to die — not because moving a site is inherently risky, but because it's usually rushed. Someone flips the switch on a Friday, forgets the redirects, and by Monday the traffic's gone and nobody knows why.

It doesn't have to go that way. A migration done to a checklist keeps your rankings intact.

First, know what kind of migration this is

"Migration" covers several different moves, and the risk varies:

A pure host move keeping identical URLs is the safest. The moment URLs change, redirects become critical.

The pre-launch checklist

Do this before you touch anything live:

1. Crawl the current site and export every indexed URL. This is your master list; you can't redirect what you didn't record. 2. Benchmark now — note current rankings, traffic, and top pages in Search Console, so you can spot problems after. 3. Map old to new. For every URL that's changing, decide its new address and plan a 301 redirect. Every important old URL must point somewhere relevant — never to a generic homepage or a 404. 4. Preserve content and metadata. Titles, meta descriptions, headings, and body content should carry over. Rankings are tied to content; drop it and you drop the ranking. This is the same discipline as a redesign without losing SEO. 5. Rebuild internal links and schema to point at the new URLs. 6. Test on staging — click through, run a crawl, check redirects resolve in one hop.

Launch day

Immediately after launch

The first 48 hours decide whether the migration went cleanly:
• Submit the new XML sitemap in Search Console and request indexing of key pages — see the Google indexing checklist.
• Crawl the live site for broken links, redirect chains, and 404s. Fix them fast.
• Watch Search Console daily for crawl errors, coverage drops, and manual actions.
• Check redirects on a sample of your most important old URLs — do they land on the right new page in one hop?
• Monitor rankings and traffic against your benchmark for a few weeks. A small temporary dip is normal; a sustained crash means something's broken — usually a redirect.

The mistake that costs the most

Ninety percent of migration disasters trace to one thing: missing or wrong 301 redirects. An old page that ranked, now returning a 404, loses its ranking and its backlinks' value overnight. The redirect map isn't the boring admin part of a migration — it is the migration, from an SEO point of view. Build it carefully, test it, and don't launch without it.