How to figure out ARV Appraisal Amount

[Lucas Hammer]

So I'm working on repairing/fixing-up a 2-flat that I have now and rather than do one small project at a time, I'm flirting with the idea of taking out an unsecured loan from something like lendingtree or Marcus by Goldman Sachs, but I want to make sure that I can refinance at the end of it to get out of that loan once it's over. I know that experience RE investors have a good idea of what ARV will be, but this being my first deal, I'm trying to figure out the best way to figure out ARV or get an idea of what an appraisal will be after the work is done.