Good points.I'd add square, level, plumb - license, insurance, bond - using permits to follow codepointing out problems the owner doesn't realize they have that are serious. 

Our NTE for a single unit is $500 so if there was a $475 plumbing bill we knew was necessary for the property we would be paying it and you would see it in your monthly statement.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Many properties will need specialized attention, especially with plumbing, electrical, and historical elements. 

He uses poorly thought through methods, I've listened to his "methods",  Thus, he has the high amount of  Due On Sale called in a short period of time. 

@Chris Morris have ALWAYS seen bad "deals" from rookie wholesalers that really don't understand what they are doing to provide value to the industry.It's getting worse because the real estate market has recovered from the 2010 Crash, yet many are still using tactics & methods developed during this time.Everyone in the industry needs to go back and look at what was being done BEFORE 2010 and start using those methods, updating them with current technology.

Granted, I have a 30-person construction crew,  a designer (my wife, so literally in-house), and a plumbing and electrical company that works on my stuff solely. 

You definitely want to use a thorough screening method like rentprep.com that gets their income, credit, background check, and call at least 3 references (make sure to verify them by address/job and then their name).  

This depends on if you are using the Cash or Accrual method of accounting for tax purposes.

Plumbing is all brand new.