Funding rehab projects, as a lender what is a fair return?

[James Fisher]

I am looking into getting into funding rehab/flipping projects. I plan to operate inf the Fort Worth/Dallas area. I understand that every deal can be different but is there an average return I should be expecting? What is fair, what is above average? Should I am for just a percent of money lent? A percent of the finale profit or sale price? Or both?

Any help and feed back would be greatly appreciated.