Website Migration Agency UK — Move Your Site Without Losing SEO
25 August 2026
Expert website migration agency UK. SEO-safe domain, CMS & hosting moves. Minimise downtime, preserve rankings. Get a free audit.
What a website migration agency actually does (beyond moving files)
A website migration is more than copying files to a new server or changing a domain name. An experienced UK migration agency plans and executes the technical, structural, and SEO aspects of moving your site — whether you're switching from WordPress to headless, moving from a .com to a .co.uk, or consolidating multiple domains. We map every URL, identify redirect chains, audit internal links, and ensure that your new platform supports your content hierarchy. We also handle server-side configurations: HTTP to HTTPS, DNS cutovers, 301 redirects with wildcard rules, and canonical tags. In 2026, search engines are stricter than ever about site speed and Core Web Vitals, so we pre-optimise images, scripts, and caching before the switch. The goal is that visitors and Google never notice the migration — except that your site becomes faster, more secure, and easier to manage.
Why UK businesses need a specialist for SEO-critical migrations
Google's UK results reward sites with strong local relevance, stable architecture, and fast load times. A botched migration can wipe out years of domain authority within days. For example, moving from an HTTP to an HTTPS protocol without proper redirects causes 'not secure' warnings and ranking drops. If you're also changing your CMS, you risk losing metadata, schema markup, and URL structures that Google has indexed. A specialist migration agency understands UK-specific concerns: maintaining your Google My Business alignment, preserving Hreflang tags if you serve multiple countries, and handling VAT or cookie-consent plugins that affect legal compliance. We also know how to manage the transition of email DNS records (SPF, DKIM) so your transactional emails don't land in spam. This level of detail prevents the tiny errors that cost UK businesses thousands in lost organic traffic.
Red flags to avoid when choosing a migration agency
Not every 'web developer' can migrate a website safely. Look out for agencies that promise a 'quick fix' without an SEO audit, or that suggest a 302 temporary redirect instead of a 301 permanent one. If they don't ask about your current rankings, backlinks, or Google Search Console data, walk away. Another red flag is a fixed quote without room for contingency. Migrations always surface legacy issues — orphaned pages, duplicate content, broken assets. A credible agency will include a discovery phase and a detailed risk register. In the UK, you should also check that they provide a named project manager and a rollback plan. Finally, avoid agencies that outsource the migration to unvetted third parties; you need direct accountability. Ask for recent UK client references in your industry, especially for sites with over 1,000 URLs, as larger migrations require more rigorous testing.
The migration process we follow for UK clients
Every migration we manage follows a five-stage process. Stage one is discovery: we crawl your current site, document every URL, and export your top 100 pages by traffic. Stage two is strategy: we decide whether to keep the URL structure or change it, and build a complete 301 redirect map. Stage three is build: we set up the new environment in a staging area, install monitoring tools, and test functionality across devices. Stage four is pre-launch checks: we validate SSL certificates, check robots.txt, update sitemaps, and run a full SEO audit inside a staging environment with a blocking meta tag to prevent indexing. Stage five is cutover: we switch DNS at 2am UK time to minimise disruption, then monitor server logs and Google Search Console for 48 hours. We also set up alerting for 404 errors and tracking code. After launch, we re-submit your sitemap and schedule bi-weekly ranking reports for the next three months.
How to measure success after migration
Success goes beyond 'did the site go live without crashing'. Within the first week, check that Google has started crawling your new URLs and that the 301 map is being followed. You should see your average ranking position return to baseline within 1–2 weeks for less competitive terms, and within 4–6 weeks for high-volume keywords. Use Google Search Console to compare impressions and clicks pre- vs post-migration. Key KPIs include organic sessions, conversion rate, bounce rate, and Core Web Vitals scores (LCP under 2.5 seconds, CLS under 0.1). A good migration agency will also track 404s daily and ensure backlinks resolve correctly. If you lose more than 10% of organic traffic after 30 days, that's a red flag requiring immediate intervention. We provide a monthly migration health report for six months, covering index coverage, crawl budget, and any emerging technical issues.
FAQ
Typical UK agency costs range from £1,500 for a small WordPress-to-WordPress migration to £10,000+ for enterprise-level moves involving custom APIs and 100,000+ URLs. Most agencies charge a fixed project fee but include a contingency buffer (usually 10–15%). Always request a breakdown that covers redirect mapping, SEO audit, and post-launch support — otherwise you may face unexpected hourly charges for fixes.