One needs to understand locations on a house by house basis, all things construction, particularly where to get materials and labor for a song, the ability to do work yourself if need be, how to deal with the city gov.

The cost of labor was onbly in the 6% range depending on the model.

Although they are not responsible for the labor nor details of the sale, their money would still be tied up in any event things did not go accordingly.

I don't see any labor costs here, either, which means that the seller was doing everything himself, and you will have to as well, if you want to keep the same cost structure.  

You can’t hire a handyman over $500 (on all work - labor and material) without a license or a 1099, if something goes wrong, you lose the 15k contractors bond leverage (your safety net) as well which you could chase if this GC fails to perform the contract.

My time and labor is worth something. 

From my understanding, new construction have a huge shortage of labor to build new houses. 

That might create something weird on the taxes.And what about all the materials, tools, and labor that I paid for in 2017?

We had a steel tub installed in a BRRRR for $800 last summer - materials and labor. 

I always appreciate people with skills like yours because you guys can make tremendous amount of money saving on labor costs.