We are in the woods where we really wanted to create another sort of living space outside of the square footage of the home. 

Even if you use piers, they are usually concrete (which is OK for most lenders), steel or wood on concrete.

The wood floors were refinished.

Quote from @Jim Woods: Quote from @Jeremiah Buschmann: I have just won some bids but have not paid yet and did some research and found you guys.

for us its leaving a few chunks of wood in the crawl space LOL

Come down off the cross, build a bridge with the wood and get over it. 

Wood Floors not sealed, tile not properly installed and grouted, cheap flat paint that the tenants can't wipe finger prints or food splashes off, countertops not caulked so water gets behind causing water damages, the cabinets were painted over not replaced the list goes on and on.

I've already renovated one of the bathrooms, and I’m planning to paint the interior, update the kitchen cabinets, possibly sand the wood floors, build a fence is a corner lot and increase the rent for the room since my tenant is currently renting the entire 3-bedroom, 2-bathroom house for $800 a month.

Use LVP flooring, it's cheaper than installing new hard wood floors and they're more durable for longevity purposes.

Wood has an ignition temperature of about 700F.