Methods for doing quick rehab estimates?

[Jesse Harris]

I am very savvy at calling contractors to get pricing on jobs where there is ample time. However, I am struggling to find an accurate way to estimate rehab costs if I only have say 24 hours to see a property and run my numbers if I want to make a quick offer. How are you guys making quick rehab estimates without calling all your contractors and getting them out to see it? I can ballpark within $5k, but that can make or break a deal! Thanks