Convert SFH to Duplex or MIL

[Jay Matthew]

I own a few sfh, not done brrrr before and looking to the wisdom on the forum for guidance. Considering an older vintage property 5 b/ 2b in central TX on 1/2 acre lot, could anyone with experience comment on best and highest potential in converting to duplex or mother in law suite? The layout I am considering is a 3b/2b main unit and another unit that will be 2b/1b that will require addition of bathroom and kitchen. What things to plan for in the rehab project - such as permits, utility and electric meters, plan for budgets, plan for timelines?