How to find measurements for long distance rehabs.

[Alexis Hernandez]

Hello everyone. I'm currently reading J Scotts book on Estimating Rehab costs. At the same time I'm practicing estimating rehab costs. I'm having trouble finding measurements like linear feet for gutters, soffits fascias, as well as sq. footage for siding and any walls. How  do you find these measurements without bothering your realtor as I would be doing estimates for several houses that may not work. These are only for quick estimates and I would get confirmation from a contractor. Any help is appreciated!