For my own piece of mind and that of my contractors, I would have an asbestos evaluation done if the rehab was likely to disturb any, IE tearing up floor tiles, siding or shingles, but I'd be weary of hiring anyone that also does asbestos remediation as they are likely to overstate/upsell. 

Also, the outside was hideous: red asphalt shingle siding.

I'm not seeing any high end finishes in these.That’s what I am seeing in most areas all in including drawings, Enginering, surveys, permits, inspections, tap fees, utilities, site work, temp power and temo toilet, trash and sweep outs, Fiber cement siding like hardy plank, architectural shingles or better, hardwood, ceramic tile, granite countertops, upgraded appliances and cabinets, upgraded light fixtures plumbing fixtures.

Buying low end LVP is just as bad of an idea as buying cheap roof shingles.

We have been living in a Dallas County for about 33 years in my current house but have only had to replace the roof shingles one time.  

You have to know what shingles costs, and toilets, light fixtures, faucets, flooring, paint, etc... all the way down to nails.

Perhaps patience is all that is needed.I am also wondering if there are any people in Texas that can help me estimate general repair costs for things like shingles, siding and other common repairs. 

(said he needs to get it so he can buy shingles.

One roof needs replaced (we are waiting on the settlement award from a class action for defective shingles), however the other is 14 months old ... so the roofer will be by tomorrow to see what went terribly wrong and to have the discussion about who is going to cover the repair of the 14' x 23' ceiling below (not to mention the insulation, etc).

This normally happens with roofs with 1 layer that are asphalt shingles and some flat roof systems.