Finding what Rehab costs will be in your area

[Jack D Grisez]

Hi, I was wondering what the best way to find the labor and material costs for a specific area. I have had trouble with accurately estimating rehab costs I'm not sure if the best route is to start calling subcontractors and ask for bids on an example house or if I should just get a GC or someone who is experienced in the area to walk properties with me at the start? All answers are appreciated thanks!