SEO-Safe Migration Plan: Field Kit

Lost-traffic replatforms are rarely bad luck. They are missing redirects and dropped metadata, and both are preventable with a plan that starts before the build.

Before the build: map every URL

Export every live URL from your sitemap, analytics, and Search ConsoleYou cannot redirect a URL you do not know about, and each one missed becomes a 404.
Run a full crawl of the current site and merge it into the listPages missing from the sitemap still rank, and a crawl is how you find them.
Keep the same URL wherever the new platform allows itAn unchanged URL needs no redirect and carries its ranking over untouched.
Map each old URL to its true equivalent, product to productAny URL with traffic or rankings left unmapped loses the authority it built.
Review the finished map before launch, not afterA map scrambled together after launch means weeks of 404s while you catch up.

SEO-Safe Migration Plan

Before the build: map every URL

During the build: redirects and on-page SEO

At launch and after

The rest of the kit is one step away.