Key Takeaways
- Website migrations without SEO planning lose 10-30% of organic traffic, sometimes permanently
- Every page receiving organic traffic needs a 1:1 redirect to an equivalent page on the new site
- Post-migration monitoring in Google Search Console for 4 weeks catches issues before they compound
- Expect a temporary 2-4 week traffic dip even with perfect execution
- Content removal during 'simplification' is the most common cause of traffic loss in redesigns
Pre-Migration Audit and Planning
The pre-migration audit identifies what you must protect. Without a complete inventory of your current SEO assets, you cannot ensure they survive the migration.
| Audit Task | Tool | Output |
|---|---|---|
| Full site crawl | Screaming Frog, Sitebulb | Complete URL inventory |
| Traffic analysis per URL | GA4, Google Search Console | Priority pages list |
| Backlink inventory | Ahrefs, Moz | Pages with external links |
| Ranking keywords per page | Search Console, Ahrefs | Keyword-to-page mapping |
| Structured data audit | Google Rich Results Test | Schema types to preserve |
| Internal link structure | Screaming Frog | Link architecture map |
Do not skip the pre-migration audit. Without knowing which pages drive traffic and earn backlinks, you cannot prioritize what to preserve. This audit is the difference between successful and failed migrations.
URL Mapping and Redirect Implementation
The redirect map is the most critical migration deliverable. Every old URL must point to the most relevant new URL. Mass redirects to the homepage destroy rankings and user experience.
- Create a spreadsheet mapping every old URL to its new equivalent
- Prioritize pages by traffic and backlink value
- Use 301 (permanent) redirects, not 302 (temporary)
- Redirect to the most relevant content match, not the homepage
- Eliminate redirect chains (A > B > C becomes A > C)
- Test every redirect before launch using a crawl tool
For pages being removed, redirect to the most closely related page that still exists. If no close match exists, create a new page covering that topic rather than losing the traffic entirely.
Post-Migration Monitoring and Recovery
The first 4 weeks after migration are critical. Proactive monitoring catches issues before they compound and allows rapid remediation that preserves rankings.
| Monitoring Task | Frequency | Tool |
|---|---|---|
| Crawl errors and 404s | Daily (first 2 weeks) | Google Search Console |
| Indexation status | Every 2-3 days | Google Search Console |
| Ranking changes | Daily (first month) | Ahrefs, SEMrush |
| Organic traffic trends | Daily (first month) | GA4 |
| Redirect functionality | Weekly | Screaming Frog |
- Fix any 404 errors within 24 hours of discovery
- Request indexing for important new URLs via Search Console
- Monitor for unexpected robots.txt or noindex issues
- Compare post-migration traffic to pre-migration baseline
- Check that all structured data renders correctly on the new site
Frequently Asked Questions
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