Website Migration SEO Checklist: Automated Redirect Mapping
Website migrations fail when redirects are incomplete, high-value URLs are missed, or staging crawls are not compared properly. This checklist gives agencies a cleaner way to protect organic traffic before launch.
Quick answer: crawl the old site, crawl the new site, export GSC landing page data, create an automated confidence-scored redirect map, review weak matches, and test redirects before launch.
Migration SEO Checklist
Before crawling
Remove pages that should not exist on the new site before you crawl staging. Otherwise they may be mapped into your redirect plan.
Crawl the old site
Export all indexable URLs, titles, status codes, canonicals, headings, and word counts from Screaming Frog.
Crawl the new site
Use the same crawl configuration so old/new comparisons are consistent.
Export GSC landing pages
Prioritize URLs with impressions, clicks, and ranking history. These are the pages most worth protecting.
Create redirect map
Map every old URL to the closest new equivalent. Avoid redirecting everything to the homepage.
Review low-confidence matches
Manually inspect weak or ambiguous matches before launch.
Test redirects before launch
Confirm status codes, chains, loops, canonicals, and final destinations.
Monitor after launch
Watch GSC coverage, rankings, traffic, 404s, and crawl errors during the first 2-6 weeks.
Why GSC data changes migration priorities
A crawl tells you which URLs exist. Google Search Console tells you which URLs already earn search visibility. During a migration, those two datasets should be combined. A low-depth old URL with thousands of impressions deserves more attention than a crawl-only page with no organic footprint.
SEOcluster.ai's URL Migration Mapper cross-references crawl data with GSC data so high-value pages are reviewed first.
If you only need to match old URLs to new ones, the redirect mapping tool covers that step: it suggests a match for each old URL, shows how confident each match is, and exports the redirect map.
Common migration risks
- Redirecting too many old pages to the homepage
- Missing indexed old URLs that were not included in the crawl
- Creating redirect chains from old migrations
- Mapping high-intent pages to weaker or less relevant new pages
- Launching before low-confidence matches are reviewed
Do not crawl a staging site full of pages you plan to delete. Clean the new structure first, then generate the redirect map.
Use a migration mapper when the risk is high
For small sites, a manual spreadsheet can work. For agency migrations, ecommerce rebuilds, or sites with meaningful organic traffic, automated redirect mapping should include match confidence and traffic priority.
Create an automated confidence-scored migration map
Upload old and new Screaming Frog crawls, prioritize by GSC traffic, and export a redirect map before launch.
Try URL Migration MapperFrequently asked questions
What is the most important SEO task during a website migration?
The most important task is creating and testing a complete redirect map from old URLs to their best new equivalents, prioritizing URLs with existing organic traffic and backlinks.
Should I use Google Search Console during a migration?
Yes. GSC identifies URLs with real impressions and clicks, helping you prioritize high-value redirects and flag indexed URLs missing from the new crawl.
Can redirect mapping be automated during a website migration?
Yes. Automated redirect mapping can match old URLs to new URLs using crawl data, content similarity, and traffic priority. Low-confidence matches should still be manually reviewed before launch.