The SEO Guide to Website Migration

October 15, 2026

How To Keep Your SEO On Track Before, During, and After a Website Migration

You’ve thought of everything for your company’s new website: a fresh design, sharp copy, and a marketing plan. But if you haven’t planned for SEO, you’re missing a critical piece of the puzzle.

We’ve seen this happen with more than one of our paid media clients. They launched a new website with another partner, only to discover that important SEO and tracking elements hadn’t made the transition with them. 

The result? Organic traffic suffered, lead generation was impacted, and some sites are still working to recover.

We wish things had gone differently for them. That’s why we created this guide: to help you avoid the same issues and set your new website up for a smoother transition.

Why Is SEO So Important During a Web Migration?

When you create a new site, search engines re-crawl and re-index your pages. Without a plan in place, you risk losing long-term authority and trust.

Some of the specific things that can go wrong: 

  • Unconfigured tracking in tools like GA4 and Search Console, leading to missing data
  • Conversions not firing for tracking purposes, or worse, leads not coming through
  • Decreased organic traffic, leading to decreased organic leads
    One example saw a 37% drop in sessions from Organic Search, looking year-over-year at the same six-month time period.

SEO Checklist for a Migrated Website Launch

There are three stages of SEO work during a website migration or refresh: pre-launch, go-live, and post-launch. Follow our mini-guide to reduce the impact on your site.

Pre-Launch

  • Export historical data from GA4 and Search Console, as well as referring domains and backlinks from tracking tools like Ahrefs or SEMRush, to give yourself a baseline to compare to the new site
  • Develop a redirect map that includes an export of the current site’s complete information architecture
  • Ensure a Sitemap.xml is set up to help search engines understand the new site structure
  • Transfer or write new metadata like title tags, descriptions, and alt text, providing clear context for your new content
  • Make sure analytics properties are firing on the staging site 
  • Test 301 redirects on the staging site to ensure all pages are indexable by search engines

Go-Live

  • Publish site
  • Implement and test URL redirects to confirm no broken links, which would lead to decreased traffic
  • Remove search engine blocks that may have been in place during site build
  • Review any server errors
  • Verify that conversions are firing on the live site so you’re able to follow leads through your systems
  • Confirm that GA4 verification tags are on the new site to solidify analytics
  • Ensure robots.txt and canonical tags are accurate to direct search engine crawls
  • Submit the new site map in Google Search Console with new URLs
  • Make sure the new URL is updated in your Google Business Profile, all social profiles, and any directory listings

Post-Launch

  • Monitor impact to website traffic and visibility over time
  • Optimize and adjust as you identify areas for improvement

Set Your Expectations

It’s important to remember that any major website change will prompt a learning period for search engines. No amount of SEO preparation can fully eliminate this. Responsible partners will guide you through how much of a dip in traffic or leads is expected, and when those numbers might indicate an issue.

At 5 Horizons, we believe that good SEO is a must for good marketing. A beautiful new design is only part of a successful website launch; the technical work behind the scenes matters, too. We’re happy to share this guide to help you on your way. And if you’re ready for a partner to walk alongside you, protect your organic visibility, and get results that actually rank, get in touch.