At some point every growing business hits the walls of its website builder: the export that isn't really an export, the feature that needs a workaround's workaround, the monthly fee for a site you can't fully control. Leaving is the right call more often than not. Leaving carelessly is how you donate your rankings to your competitors.
We've run this migration for ourselves and for clients, most recently rebuilding an entire marketing site out of a hosted builder into clean code we own. Here's the order of operations that protects the SEO you've already earned.
Step 1: Inventory before you touch anything
Export the full list of URLs that exist today, then pull which of them actually earn traffic and rankings from Search Console. This split matters: pages with equity must survive at the same address or be redirected; pages with none are free to die. Most sites discover 80% of their SEO lives on 20% of their URLs.
Step 2: Rebuild content-complete, not content-similar
The new site should carry over every page that earns its keep, with the same or better content depth, the same target queries, and the same internal links between them. This is also the moment to fix what the builder never let you do properly: real heading structure, schema markup, image alt text, page speed.
Rankings follow content and links. Keep both intact and the move is a non-event. Change both at once and you've launched a new site with an old domain.
Step 3: Map every old URL to a new one
Builders love weird URL patterns. Your new site probably uses cleaner paths, which means a redirect map: every old URL that ever earned a click gets a 301 to its exact new counterpart, not to the homepage. Homepage-dumping redirects are how link equity evaporates.
Step 4: Cut over fast and completely
DNS flip, redirects live, old builder site retired, all in one move. The dangerous state is the half-migration: two versions of the site resolving at once, search engines confused about which is real. Go all in, same day.
Step 5: Watch the instruments for a month
Search Console will show crawl errors and coverage changes within days. A brief wobble is normal; a cliff means a redirect gap, and the inventory from step 1 tells you exactly which URL fell through. Fix fast, and equity recovers.