A prospective client asked me this recently, almost apologetically. They'd collected three quotes for moving their mid-size site off Drupal 7. Two agencies came in between $12,000 and $15,000.
If you've been told that moving your website from Drupal 7 to the current version is more complicated than a normal update, that's true — and it's worth understanding why before you start the project.
If your website runs on Drupal 7, here's the short version: that version of the software stopped being supported in January 2025. No more security fixes, no more safety net.
Drupal 7 first came out in 2011, and it did its job for a remarkably long time — right up until it stopped being supported in January 2025.