The old vendor is genuinely unreachable. Can it still be recovered?+
Usually yes. Domain ownership can be pursued through the registrar with company documents and payment history, though it takes time. If one account truly cannot be recovered, we plan a route around it that does not cost you search position.
If we rebuild, do we lose our Google position?+
Only if the old addresses are simply dropped. What protects position is mapping each old address to its replacement before the switch, then confirming it actually works afterwards. That is its own job, and it is the part most often skipped.
We only want small fixes, not a rebuild.+
If the structure is sound, that is the right and cheaper call. We check the condition first and tell you what can be fixed in place before suggesting anything larger.
Our site was built on a subscription site builder. Can it move?+
Yes, though the content usually has to be pulled out page by page because such tools rarely offer a complete export. What matters is that the old addresses still get mapped so no link dies.