Just as another idea for you. I have been in the bathroom and kitchen remodeling business for many years until I started doing re-habs for myself. I have always used two different plumbing contractors and the same electrical contractor. I save tons of money by doing all of the demo work for them and assist as they are doing their thing. I cut the concrete out, move and bore studs, etc. I am flexible with their schedule and when I call them in at their convenience they know all is ready to go and I even clean up for them. I have a small team who does my carpentry, tile floors and I do the bathrooms and kitchens. I use small contractors who like my method because they can work around my schedule and they know they are in an out quickly with no obstructions in their way. I always deal with the same people also so we have a good relationship instead of different tradesmen coming in. Most of the time when I have a project they scope it out and tell me what they want done before they get there. All the best to you in your venture.