Here's an article with things to consider when selecting a cost segregation company.

Is my thinking correct that homes in highly appreciated areas won't benefit as much from Cost Seg. 

And hopefullt you won't need a traffic light, which costs in excess of $100,000, though you will be required to do a traffic study. 

Can you speak on how you source granite slabs cost effectively?

They have cost my business tens of thousands of dollars and countless wasted hours of follow ups and missed opportunities.

A cost segregation study was performed on this single family home in Iowa City, Iowa with a depreciable cost basis of $649,900.

However, the depreciation claimed while the property was a rental must be accounted for upon the future sale of the personal residence, which could increase your capital gains tax liability.The adjusted basis of the property (original cost minus depreciation) will be used to calculate gains or losses at the time of sale.

During this renovation period would you, as the lender, want an Actual Cash Value or Full Repair Cost policy in place?

The costs are just ridiculous though. 

Agree it is difficult to assess costs when they vary so much by location.Keep in mind that some turnovers are sickenly expensive, and that is just the nature of the business.