Turnkey has a tendency to overcharge or worse yet lie about the state of the properties since they know the investors wont come to the property.

The best way to go about not getting overcharged for rehab costs is to interview contractors and make sure you get separate bids from each one of them (minimum 3). 

And study books on doing house repairs, even if you don't intend to do such repairs, but will hire them out; because you'll better understand what this kind of contractor does for you, as well as know if the contractor is possibly over-charging you.

Many are So, it's true you get cheated and overcharged sometimes, and you don't have the same control, and managers don't tend your property like you would personally, but for me it's worth it

Contractors turnover, overcharged by a dishonest plumber, first tenant was really bad, etc.

I am a cash investor and I find it extremely hard to find GC who doesn't overcharge and doesn't lie.Any tips on how to find one or referrals will be very appreciated.Thank you all in advance,Eli   

You've also got to make sure all permits are pulled/closed and all subs are paid (to avoid mechanic's liens).If the deal is he doesn't want to be over-charged, maybe title can do a holdback, then you submit the bill from a lic/bonded contractor for a draw with rem to seller?

I don't have to overcharge because I know the  market will overpay naturally right now.

This makes absolutely no sense to me that they decide to overcharge their most loyal client, this is the exact opposite of having a team mentality and concept.The only way you can potentially mitigate against this from happening is to have an initial expectation conversation with them, Let them know what you want and expect out of the business relationship and as well as finding out what they want and expect out of it as well for them.

If he overcharges you, he could be responsible for damages above your security deposit.