Modeling Fix and flips

[Brian Fung]

I have 2 questions: 

1. When you underwrite a fix and flip deal in your upfront due diligence, what figures do you us for the cost to sell? (do you use a percentage, standard fixed fees + percentage, etc)

2. When you evaluate the profitability of a deal, what metrics do you care about most? (ROI, Cash on Cash return, Flat dollar amount such as 40k profit/flip? etc).

***full disclosure I am a real estate investor as well as a lender and I'm looking for these numbers to get a better feel for how other investors are thinking and analyzing THEIR deals***