Estimating rehab costs and General tips for wholesaling properties

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Hi,

I recently started learning about wholesaling properties. I have a good idea of the ARV around my area, however, I feel scared of making offers on properties since I'm not familiar with repair costs.

With that being said, how do you learn to estimate repair costs? I was thinking about bringing a contractor to these properties so they could make an estimate on the properties. However, this would be very time consuming if my offer doesn't even get accepted. Also, do contractors normally charge for repairs estimates?

Any help and tips would be greatly appreciated.