I'd imagine that replacing all the drywall is not going to be insanely more expensive that replacing half of it, but no idea what supply of material is, nor install labor.  

I’ve heard before that labor costs via contract is typically 3x what materials are.

This is the largest house I have renovated and the biggest renovation.Construction went well, but we got hit with a huge surprise the asphalt shingles were laid on top of the original wood shingles, not only more labor to tear it off, but more labor and material cost for the decking.But, by the time it was over I had delivered an AMAZING house.

What stymies me is why buy materials ie roofing shingles and install them 3" off the nailing line that's clearly marked?

After all, the loan request is being evaluated on whether or not the projections materialize and generate the kind of cash flow that will pay-off the loan.

They usually have the best installation prices and as long as the material isn't overpriced (remember, you have to buy all HD material for them to install),  you should walk away a happy customer. 

Landlords may bill only for material used or anything you have a receipt for to show actual costs.In your situation I doubt if it is worth perusing in small claims court.

Both quotes are with labor and materials. 

If that renewal stands the expiration date is now May 15, 2018Tenant has remedied material lease violations (unauthorized pet, trash on property) but continues to be behind on monthly rent payments. 

The paperwork is fairly straightforward, the marketing, materials, vehicle etc is all deductible.