Trying to estimate Rehab costs for potential whole sale deal

[Adrian Smude]

I just visited my first property for a potential whole sale.  The people are very nice.  We did not talk numbers, I told them I'd do some research and get back with them with an offer I could make.  They are not sure on the exact sqft but I think I've come up with a very close number, 2,400 heated and 3,200 total.  It's a wood frame and is pretty much a total guy job and I believe it needs a new roof.  They said they had roof work done about 8 years ago but I see where it's leaked although the shingles look to be in pretty good shape.  I'm okay at estimating bathrooms kitchens, and roof but I've never done anything with wood frame floors needing to be replaced.