And the funny thing is, both appraisers might conclude the exact same opinion of value for the property.Price per square foot is not a useful way to valuate real estate, so you can't make the argument that you overpaid.

To complete some of this paperwork, you'll need to know information about the house, such as, the year it was constructed, square footage, and the source of power/fuel type for the heating system/stove/water heater/etc. 

So I don't know if there is like a foot of concrete above the ground or if there is a concrete base and something else underneath.

I did my best to communicate to the seller every step of the way and also footed the bill for some of the expenses he acquired, after all it was most important to me to look out for the seller and get him out of his difficult situation. 

I watched Brandon's youtube video using the 4 square method and my CoC Return was 40.4% vs using the excel spreadsheet punching in the same numbers but coming back 10% lower.

Are you working with a TK company or you have someone acting as your foot on the ground?

Do I compare the building with a single story home of similar square feet?

Other stuff like out of square walls and doorjams with the sheetrock proud of them you don't notice till you're working there. 

The scratch areas are where you'd expect: around the couch/bed/furniture footing areas.

@Josh Cohen - Bigger Pockets has two great books that can be found here - The Book on Estimating Rehab Costs is a fantastic source of numbers, while The Book on Flipping Houses is a fantastic source of strategy.I believe that you can get them in PDF form or hard copy from either BP or Amazon.To give you an idea of what the first book has - an example page is for flooring, where it will go over all of your options (laminate, hard wood, tile, etc) with cost per square foot, installation cost, comparisons for how long each option will last before needing to be replaced, etc.