Estimating ARV pre-purchase?

[Andrew F.]

Looking at an off market property, that “feels” like a good deal: estate sale, cosmetic updates only, ability to convert from 2/1 to 3/1.

Probably a pretty basic question, but what's the best methodology for estimating ARV (and post rehab appraisal). Right now, the best I'm seeing is to look at Zillow recently sold and try to find sold houses in a radius that seem comparable. But I feel like there has to be a more accurate way to go about this?

Appreciate any insight! The goal would be to BRRRR this property, so defining my ARV is of course critical.