Where to find rehab general pricing?

[Austin Wilson]

I am just starting out and have noticed it is very hard to find accurate information when it comes to how much it costs to i.e. replace a roof, window replacement, getting plumbing reran, cost of dumpster rentals, etc. Where are you guys going to find these other than having a contractor on deck to give you estimates? While I have a contractor, we are not at the level yet where I can send him jobs and ask for general costs. I am trying to learn how to estimate rehab costs for flips and BRRRs. Any advice on this would be appreciated.