A site migration is one of the highest-risk events in SEO. Done well, it preserves years of accumulated ranking signals and sets the foundation for long-term organic growth. Done poorly, it can strip a UK business of its search visibility in a matter of days, with recovery taking months.
Working through migration projects with UK retailers, professional services firms, and growing SaaS businesses, the same failures appear repeatedly. Most of them were preventable with a disciplined seo website migration checklist followed from the start, not assembled in a panic two days before launch.
The twelve areas below cover the full migration lifecycle: what to do before a single line of code changes, what to lock in on launch day, and what to monitor after the site goes live.
Why the Pre-Migration Phase Is Where Rankings Are Won or Lost
The most common reason UK site migrations fail is that the SEO work begins after development is already underway. Developers have locked in the new URL structure, the CMS has been configured, and the content has been imported before anyone has audited what the current site is actually ranking for.
Before any migration begins, crawl the existing site with Screaming Frog or Sitebulb and export every URL that returns a 200 status code. Cross-reference this list with Google Search Console data to identify which pages receive organic traffic and which carry backlinks. These are the URLs you cannot afford to lose or break. Any page in that list needs an explicit destination on the new site, not a generic homepage redirect.
Also capture baseline data at this stage: organic traffic by page, keyword rankings for your top 50 terms, Core Web Vitals scores on key templates, and any SERP features you currently hold, including featured snippets and People Also Ask inclusions. These benchmarks are what you will measure recovery against post-launch. A well-built seo website migration checklist begins here, not on launch day.
Building the Redirect Map: The Single Most Important Document
A redirect map is a spreadsheet that pairs every old URL with its new equivalent and specifies the redirect type. For a permanent move, every redirect must be a 301. For a domain migration, a 308 is also acceptable and passes link equity in the same way.
The redirect map must be exhaustive. Every URL that has ever received organic traffic, earned a backlink, or appeared in Google’s index needs a mapped destination. Pages with no equivalent on the new site should redirect to the closest category or parent page, never to the homepage by default. A mass redirect of unrelated pages to the homepage sends Google a signal that the redirects are non-canonical, which delays the transfer of link equity and can suppress rankings for months.
For UK e-commerce sites migrating between platforms, such as Magento to Shopify or WooCommerce to a headless setup, URL structures frequently change from /product-category/product-name to /collections/product-name or similar. Every variant must be in the map, including paginated URLs, filtered category URLs that were indexed, and old blog post URLs if the slug structure changes.
Do not stack redirects. A chain of three or more hops wastes crawl budget, loses link equity at each hop, and slows page load. Any redirect in the map that currently passes through an intermediary URL must be flattened to a single 301 from the original URL to the final destination.
What to Lock In Before Launch Day
Going live without these items confirmed is how UK businesses lose rankings they have spent years building.
The noindex situation is the most dangerous. Development environments are almost always set to noindex to prevent Google indexing a staging site. Before launch, verify that every page template has been switched to index, follow. Check this with a Screaming Frog crawl of the live domain using a fresh user agent. Missing this step has taken sites from tens of thousands of monthly organic visits to near zero overnight, with recovery taking four to six months.
Canonical tags must be set correctly before launch. If your new site generates multiple URL variants through session parameters, filtered navigation, or pagination, canonical tags must point to the clean version of each page. Any page without a canonical tag or with a malformed one is a signal conflict waiting to suppress rankings.
Structured data from the old site must be present on the new site and must validate against Google’s Rich Results Test. Schema that exists on the old site but is absent or broken on the new site will cost you rich results in UK search results immediately and take weeks to recover.
XML sitemaps must include only URLs returning a 200 status and set to index. A sitemap that includes redirected URLs, noindexed pages, or 4xx errors sends Google mixed signals about what you want indexed. Submit the updated sitemap in Google Search Console within the first hour of going live.
The Domain Migration Specific Steps
If the migration involves a domain change, such as moving from an old brand domain to a new one, or from HTTP to HTTPS, additional steps apply beyond the standard seo website migration checklist items covered above.
Use Google Search Console’s Change of Address tool. This is available under the Settings section of your old domain’s property. It signals to Google that the move is intentional and permanent, and it accelerates the transfer of ranking signals from the old domain to the new one. According to Google’s official site migration documentation, the Change of Address tool is only for moves that affect the entire domain, not subdirectory changes.
Keep the old domain live with redirects in place for a minimum of six months. Google’s guidance recommends keeping redirects active for at least 180 days after a domain move. UK businesses that let the old domain expire or remove redirects too early lose the link equity that took years to accumulate, as inbound links from third-party sites that have not been updated will simply return 404 errors.
For HTTP to HTTPS moves, ensure that the SSL certificate covers all subdomains, that the canonical tags update to the HTTPS version, and that all internal links and resource URLs (images, scripts, stylesheets) are updated to HTTPS. A single mixed content error can prevent browsers from loading page resources and degrade user trust signals.
Post-Launch Monitoring: The 30-Day Window That Decides Recovery Speed
The first 30 days after a migration launch determine how quickly, and whether, full ranking recovery happens. During this period, monitor daily rather than weekly.
Inside Google Search Console, watch the Coverage report for unexpected spikes in 4xx errors, the Sitemaps report for URLs that fail to index, and the Performance report for keyword ranking movements on your top terms. A drop in impressions without a corresponding drop in clicks often indicates that pages have been deindexed, not just that click-through rates have changed.
Use Screaming Frog with the Googlebot Smartphone user agent to crawl the live site at 48 hours and again at two weeks post-launch. Check that all redirects resolve correctly, that no redirect chains have accumulated, that canonical tags match sitemap URLs, and that structured data is rendering on the mobile template (relevant since Google indexes the mobile version of every page).
Set up rank tracking before launch so you have daily movement data from day one. Monitor your top 50 keywords and your top 100 traffic pages individually. Sitewide traffic averages hide page-level problems. Some pages may have recovered fully while others are sitting on a broken redirect or missing schema that needs fixing before they can regain their previous rankings.
Running a thorough seo technical audit checklist within two weeks of going live catches the issues that appeared during the launch process but were not present during pre-launch testing. For UK e-commerce migrations in particular, the ecommerce seo checklist covers the category and product page specifics that a general migration audit does not address.
Frequently Asked Questions
How long does it take to recover rankings after a website migration? Most UK sites see significant ranking recovery within 60 to 90 days of a well-executed migration. Poorly managed migrations with broken redirects or missing schema can take six months or longer, and some ranking positions are never fully recovered.
What is the most common SEO mistake during a website migration? The most common mistake is failing to redirect every indexed URL to its new equivalent. Sending old URLs to a generic homepage, or leaving them as 404 errors, destroys the link equity and ranking signals those pages had accumulated.
Do I need to use the Google Change of Address tool for every migration? Only for domain name changes. If you are migrating your CMS or redesigning your site without changing the domain, the Change of Address tool does not apply. Use it only when moving from one root domain to another.
How long should I keep 301 redirects active after a migration? Google recommends keeping redirects in place for at least 180 days. For permanent domain moves, many UK SEO practitioners leave them in place indefinitely, as inbound links from third-party sites may take years to be updated.
Should I migrate and redesign at the same time? No. Stacking a domain move, CMS migration, and visual redesign into a single launch makes it nearly impossible to diagnose which change caused a ranking drop. Separate migrations from redesigns wherever possible, or accept that fault isolation will be difficult if problems arise.
Final Thoughts
The migrations that go smoothly share one characteristic: the SEO work starts before the development work, not after. Capturing the baseline, building the redirect map, and verifying every pre-launch item takes time that development teams are rarely given. Making the case for that time, with specific examples of what ranking loss costs in monthly organic revenue, is often the most valuable thing an SEO practitioner does on a migration project.
For the technical standards Google uses to evaluate site moves and understand redirect signals, the Google Search Central site migration documentation was updated in March 2026 and remains the most authoritative source on how Google processes domain and URL changes.
Start the redirect map before any developer commits a single URL structure decision. Everything else on a seo website migration checklist is easier when that document exists from day one.
Jame Harry is a UK-based e-commerce strategist and digital marketing expert with over a decade of hands-on experience helping British businesses grow online. He has worked directly with independent retailers, Etsy sellers, and Shopify store owners across the UK, advising on everything from product listing optimisation to paid social campaigns. James specialises in turning small online shops into consistent revenue generators, with a particular focus on low-budget digital strategies that deliver measurable results without agency fees.