I just sold a spec, I built a house for my self last year and finished a spec this year, I bough the lots at tax sale, and I was the GC, HVAC, Tile, Flooring, Cabinet, Painter, and Misc. guy, made a nice profit, but the crappy part is taxes, its like a flip, short term gains. good luck!

You can see this all the time on trucks: 'ABC Plumbing - Specializing in remodels, baths, kitchens, tile, etc'What this means is that they are really not good at anything and desperate to take on any job just to make a few bucks.

Ask your rehabber where he gets materials, try to find some lumber yards and suppliers, not lowes of HD as they have credit departments.Set up a line of credit with suppliers and by the paper at the time of sale.

We’ve noticed water seeping issues through the shower tiles, causing damage to the sheetrock in our only bathroom on main floor.

The scope of repairs include: complete renovation of master bathroom, kitchen, and guest bathroom.I spent about $1,700 on materials for the master bathroom (vanity, lighting, tile, grout, 2 medicine cabinets, cement, drywall, etc.).

I can't speak for contractors, but as a DIYer, I know even the most basic kitchen renovation may end up costing me 10k if I were to do it myself. 2-3k for cabinets. 1k for plumbing and fixtures1k for electrical and fixtures2-3k for granite countertops1k for tiling/flooring1k for miscellaneous like painting, etc. 

The real value with a GC is not only do they know the process and how to properly schedule/manage subs.....they know which subs/suppliers to use and which ones not too.

I know a tile guy in our local neighborhood that seems great, i just havent used him.

I've talked to suppliers and sub contractors and gotten the measurements and quotes I need. 

I have kids and I know damn well they do not always close the curtain and I especially know when the tiles in the bathroom become uneven because of the water that gets trapped under them.