SEO checklist for a website migration (protect your rankings)

A website migration is the single biggest avoidable risk to your search rankings — and the SEO checklist that protects them comes down to redirecting every old URL, preserving your content and metadata, and verifying everything after launch. Done carefully, you can move a site with rankings and traffic intact. Done carelessly, a migration can wipe out years of SEO overnight. We treat migrations as a high-stakes project for exactly this reason, and it's a core part of our SEO work.

If you're moving hosts, redesigning, changing your domain or replatforming, this checklist is what keeps your search visibility safe through the change.

What a website migration is

A website migration is any significant change to your site's location, structure, platform or design that affects its URLs or how search engines access it. Because rankings, backlinks and indexing are all tied to specific URLs, any change to them carries SEO implications — most importantly redirects, sitemaps and canonical tags.

Get those right and search engines smoothly transfer your existing authority to the new site. Get them wrong and you risk lost traffic, broken links and dropped rankings. The work is mostly about preserving what you've already earned.

The types of migration

Different migrations carry different risks, so it helps to know which you're doing:

• Redesign. Changing the look and feel. Minor (a new theme or section) or major (moving platforms entirely, e.g. WordPress to Shopify). Major redesigns usually change URLs and templates, so they carry real SEO risk.
• Host change. Moving the site from one web host to another — often for speed, reliability or a CMS update.
• Domain change. Changing the domain name itself. High-risk, because every URL changes.
• Protocol change. Moving from one protocol to another (for example, to HTTPS).

Often a migration combines several of these at once — a replatform that also changes the domain and design. The more that changes, the more rigorous your checklist needs to be.

Before you migrate: map and benchmark

The work that protects you happens before launch. Two steps matter most:

• ✓ Crawl and map every existing URL. Build a complete inventory of your current pages so nothing is missed, and plan exactly where each one will redirect on the new site.
• ✓ Benchmark your current performance. Record current rankings, traffic and indexed pages before the move, so you can verify afterwards that everything transferred — and catch any drop quickly.

The core technical checklist

These are the items that make or break a migration. Work through every one:

• ✓ Set up 301 redirects. The most important step. Permanently redirect every old URL to its matching new URL. This preserves rankings and link equity and prevents lost traffic. Nothing else matters if this is wrong.
• ✓ Update and submit your sitemap. Refresh your XML sitemap with the new URLs and submit it to Google so it can index the new site quickly.
• ✓ Update your robots.txt. Make sure it isn't accidentally blocking pages you want indexed on the new site.
• ✓ Check canonical tags. Update them so they point to the correct new URLs and you're not signalling duplicate versions of the same page.
• ✓ Preserve titles and meta descriptions. Carry over your optimised title tags and meta descriptions so you don't lose the relevance and click-through you've built.
• ✓ Test site speed. A migration is the perfect moment to ensure the new site loads fast — speed is a ranking factor and a user expectation.
• ✓ Set up a 404 page. A helpful 404 catches anyone who hits a moved or deleted page and keeps them on-site.
• ✓ Update internal links. Point all internal links to the new URLs rather than relying on redirects, which is cleaner and faster.
• ✓ Confirm mobile-friendliness. Make sure the new site is fully responsive — most traffic is mobile and Google indexes the mobile version.

Many of these connect to broader good practice — our on-page SEO checklist is a useful companion for getting the new pages right as you rebuild them.

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Ninety percent of migration risk lives in one line item: redirects. Map every URL, redirect every URL, and verify every redirect — then breathe.

— Whitehat migration playbook

After you go live: verify and monitor

Launch isn't the finish line. The first days afterwards are when problems surface, so verify and watch closely:

• Update external listings. Refresh your Google Business Profile and Bing Places with any changed details so your local presence stays consistent.
• Update your backlinks where you can. Reach out to the most valuable sites linking to your old URLs and ask them to point to the new ones. Your redirects cover the rest, but direct links are stronger.
• Monitor traffic and rankings closely. Compare against your pre-migration benchmark. A small dip is normal as Google reprocesses the site; a sharp or sustained drop signals a problem — usually a missed redirect — to fix immediately.
• Check Search Console for crawl and index errors in the days after launch and resolve them fast.

When to get help

If your site has meaningful organic traffic, a botched migration is expensive to recover from — sometimes more expensive than the migration itself. For a small site, this checklist is enough to do it yourself carefully. For a larger or more complex move — a replatform plus a domain change, say — the safe choice is to have specialists handle the redirect mapping and verification.

Either way, the principle holds: a migration is about preserving what you've earned. Plan it properly, follow the checklist, and you'll come out the other side with your rankings and traffic intact — and often a faster, better site to build on.

Frequently asked questions

What is a website migration in SEO?

A website migration is any significant change to your site's location, structure, platform or design that affects its URLs or how search engines access it — such as moving hosts, redesigning, changing domain or replatforming. Because rankings, backlinks and indexing are tied to URLs, every such change carries SEO implications that must be managed.

How do I migrate a website without losing SEO?

Map and benchmark every existing URL first, then set up 301 redirects from each old URL to its new one, update your sitemap and robots.txt, preserve titles, meta descriptions and canonical tags, and verify everything after launch. Redirects are the single most important step — they preserve rankings and link equity.

Why are 301 redirects so important in a migration?

Rankings and backlinks are attached to specific URLs. A 301 (permanent) redirect tells search engines an old URL has moved to a new one, transferring that ranking authority and link equity to the new page. Without redirects, changing URLs severs that equity and you lose traffic and rankings overnight.

Will my rankings drop after a website migration?

A small, temporary dip is normal as Google reprocesses and re-indexes the new site. A sharp or sustained drop signals a problem — most often a missed redirect or an indexing error. Benchmark your performance before the move and monitor closely afterwards so you can catch and fix issues quickly.

Should I hire someone to handle a website migration?

For a small site, a careful DIY following a thorough checklist is fine. For a larger or more complex move — such as a replatform combined with a domain change — the risk of lost traffic is high and expensive to recover, so it's safer to have specialists handle the redirect mapping and post-launch verification.