Setbacks, parking, electrical, sewer, water, hydrants, entrances, night lights, phone lines, fiber optics, storm drains, storm ponds if needed, turn in lanes, etc. 

New tub costsTub (fiberglass) $147 (HD)Watts pvc pop-drain kit $ 20 (HD)5 Sheets Hardi-backer $45 (HD)Box Backer-on screws $7 (HD)Fiber tape $4 (HD)12x12 wall tile $50 (HD)Non-Sanded Grout $15 (HD)Spray on Sealer $9 (HD)Tube Colored Caulk $7 (HD)Bag Speed Set $14 (HD)Bucket of Mastic $30 (HD)Tile labor $150Plumbing labor $50Add em up and thats what it costs.

From the photo, the exposed rebar appears to be welded wire fiber (WWF) which is typical in slab foundation.

Based on the above, debating whether vinyl siding is appropriate vs. fiber cement, etc..

YouTube "National Fiber Dense Pack" for some info on densepacked cellulose.You might consider a "home energy audit" if they are available in your area. 

And no, it's unlikely that you need a custom spec mixture, but a footing mixture is typically less expensive than a slab mixture (in part due to the amount of cement in the mix as well as additives such as fiber commonly used for slabs).  

We use a lot of Marvin Ultrex which is a fiber glass frame guaranteed for life (not vinyl) and much more expensive.  

this is the scope of work. the dimension of the roof is roughly 45X151) Tear-off all layers of roofing and gravel down to wood decking and legally dispose. 2) Inspect wood decking and replace all deteriorated and broken areas at $ 2.50 per sq. ft. 3) Inspect existing Ceramic Copings and replace all deteriorated and broken at $ 35.00 Each.4) Install Fiber Cant Strip at the base of the walls and curbs.5) Install 1 layer of Base Sheet over wood decking using corrosion resistant screws and plats. 6) Install 1 layer of Modified Bitumen CertainTeed GTA Granulated. 7) Install Metal gravelstop and gutter flashings at the roof edges. 8) Flash all vents, soilpipes, and chimney using the same Modified Bitumen. 9) Install 5” Galvanized Box Gutter and 3x4 Downspout to replace existing. 10) Pick up and haul away all roof debris generated by Presidential.

People will even go so far as to make up fake names, facebook accounts, and yes they will even fake photos and Bigger Pockets accounts to attempt to slander your name.Just stay true to your own moral fiber, know you are doing right for your family and in the end, over time, truth always wins out.

Sounds like the fault of the contractor for pouring in the rain.Was the concrete pre-mixed with the fibers added in for extra strength??