I would do all the work myself on something like this, from the demo to the replacement to the drywall patching to the tiling to the colormatched painting.

If I was trying to finish 850sqft for under 50k I'd try to find some cheap labor to do the handyman work like finishing demo, leveling floors and framing then have multiple subs bid for mechanicals (HVAC, electrical, plumbing).

The interior had been through a complete demo.

My responsibilities included demoing the existing structure and doing any environmental remediation.

I gave $6K  when demo started for HVAC installation.

to get it permitted, you would have to apply for the demo permit, then apply to be a contractor, then submit a drawing of the changes. 

All quotes are in and work as started with the demo and framing the new bedrooms.

All of them typically offer free trials, demo versions, and will schedule calls and webinars with you to show the features, take advantage of it!

WSSC will charge a fee for the extra toilets so you have to order a toilet count before the demo to get credit if you have more then 1 toilet. 

When we began chipping off the old 4x4 tile on the bathroom walls we found a slab behind each wall about an inch thick of concrete to which the tiles are adhered to directly.Is there an easy way to remove the tiles or should be just demo the entire slab, tile and all and just replace with 1/4" concrete board on the remodel?