As the title says. I'm going to copy and paste my and the comment I was responding to from Discord into here to describe what I mean.
"It'd be great if hearths said what upgrade was too in their upgrade requirements." - @5ColouredWalker
While I don't have this problem, I distinctly remember in a PotatoMcwhiskey video (and I'm sure others have experienced it), that he forgot which level was neighborhood. So not only would a clearly shown text into what you're upgrading next into be nice, but maybe also a dropdown of the lists of upgraded Hearths in order be nice. And if you don't have a level unlocked, it could have ??? instead. Anyways this seemed like a really simple UI change that would be a huge QoL upgrade, so please consider it, thanks!
I think it's simple enough, and the visual changes on the hearth building indicate which tier it's been upgraded to. A simple solution to this could be to add the description Tier (insert number) (insert hearth upgrade name) to order requests. With an extended solution to mouse over tooltip of the word of the building/upgradedbuilding. which would then have the name of the building and the requirements to build it/upgrade it.