In general hands off ADU additions cost more than the value that they add.Have you looked into what the garage could rent for as a garage?  

I'm out in Denver but have family in NC and from what I've seen it seems like a fantastic market.In addition, if you house hack there are programs like NACA that will help you qualify. 

Since you have no contract, there is nothing that says you do not have to pay if you are not satisfied, and your spreadsheet would seem to indicate you owe him the money.Similarly, since you paid him for previous work on the spreadsheet, and the spreadsheet shows you owe him for additional work, your argument is not very strong.

I have also added line items for common area monetering and additional appliances.

Additionally, there are a ton of housing providers and organizations around the country trying to fill vacancies.

When the transaction closes, the purchase is funded, and we set aside additional funds in an escrow account to pay predetermined professionals to make any required or desired repairs or upgrades to a property AFTER the buyers settle on the purchase transaction.

in addition to the military growth the tourism from our emerald coast beaches is flourishing. 

In addition, 1031 Exchange Qualified Intermediaries are generally not required to be bonded, insured or maintain any other form of minimum equity capitalization.

An addition of soil, a swale, or a French drain may be necessary.● Part of the patio on the east side of the garage has a negative slope.

The unique part is the additional basement garage.