How much to pay contractor to assess fixer cost when viewing prop

[Diane Tycangco]

Hi everyone!  I am interested in a property that needs fixing up and would like to bring a contractor with me when I go see the property.  First of all, how do I find a contractor who would be willing to go with me and see the property when my offer to purchase the property depends on whether the costs are viable and secondly, how much do I pay him for his time and trouble?

Thank you!