Any contractor or subcontractor who works on your house should be bonded, licensed, and insured properly according to state and local standards. Insurance can help protect you if your home gets damaged during construction or workers are hurt on site, while hiring a bonded contractor can help protect you if the contractor fails to pay workers, doesn't pay for permits, or doesn't finish the work. Here's more on how to do your research.
You want a company that has time for you and has long-term relationships with its subcontractors. Make sure you and your contractor have the same expectations about how often they will be onsite once the remodel or renovation kicks off. The contractor should be open with you about how long each stage of the project will take, and they should show a good understanding of what factors could potentially push that timeline out.
I just renovated a 6X12 bathroom. Old cast iron tub removed. Removed and saved existing vanity and vanity top. Removed the toilet and replaced the existing rotten flooring and added on to the existing partially rotten floor joist. Removed the drywall and tile from around the old tub. After the new flooring was in I had to modify the existing plumbing to accommodate the new tub and shower surround. The hot and cold water lines had to be raised to fit the surround because the new tub is taller and the drains had to be installed and moved to fit the new tub. Drywall was finished and painted. New faucets,New tub,Tub Surround, and flooring materials were purchased by the home owner. Labor cost was 4,584.00
As a contractor I can tell you that most reputable contractors probably don't need your job, and if you make things too complicated or troublesome, they will move on to other jobs that don't throw up red flags. Much of what you ask for here is reasonable, but bringing a second contract into the equation can set of some alarms that you may be a difficult customer to work with or even a litigiously minded person who is likely to try and bring a lawsuit whether deserved or not. Anything you want covered should be in the original contract.
Bathroom remodels provide 60 to 70 percent resale returns as a home improvement project. However, this project isn’t cheap. It is essential to plan your remodeling ideas ahead of time. Then, hire a remodeling contractor for the job. Ask questions, set realistic expectations, get accurate cost estimates and budgeting from the start. Also spend time learning how to work with a bathroom contractor.