Property Repairs Ask for W9 / Contract?

[Derek Tuohy]

Hi  I need to make repairs between tenants.  I have a contractor that gave an estimate to do $1700 in general repairs.  Should I try to have him fill out a W9 and sign some sort of contract since money over $600 is being exchanged for services?  This is what I have done with a more extensive rehab with my GC, but wasn't sure if this is standard for smaller repair budget and dealing with a handyman / sub directly.  Thanks in advanced?