As you mentioned above, favorable recourse can be difficult.While predicting exact increases for taxes, insurance and utilities can be difficult, it can be done with a reasonable level of accuracy. 

I've been curious about the costing accuracy of the City SoWs.

This is data which the pulled from other website without vetting the quality/accuracy of the information.

I use the AVI Calculator & the Philadelphia department of revenue websites to verify if the homes were recently sold and the accuracy of the sq footage.

Regardless of how far you go with accuracy, I would prepare a good presentation for your property, meaning a nice portfolio/folder with the property, pictures, some briefs on comps, and a delineation of what the ARV is, price to the buyer, estimated repair costs, and maybe some features of the property.

Regardless of how far you go with accuracy, I would prepare a good presentation for your properties, meaning a nice portfolio/folder with the property, pictures, some briefs on comps, and a delineation of what the ARV is, price to the buyer, estimated repair costs, and maybe some features of the property.

If this is a home that best suits your family needs, the first thing I would do is pull your personal credit report to ensure full accuracy.  

As my estimating teacher said, there is no wrong answer in estimating, it is just a question of accuracy.

In fact, they can handle Commercial, Industrial and Residential projects with the same precision and accuracy.

I do not have a list written out; but my process increases in accuracy as I work down the layers.