My suggestion is when talking to contractor be subtle and ask your questions. Ask if he/she will have a dumpster or trailer to haul away debris. If the don't get dumpster or have a trailer then you probably don't want them to work on your home. Tell them your concern with the only toilet in the house. Unless it is not safe I have always reinstalled the toilet so it could be used at night. A good contractor will work with you in anyway possible because you are the key to more business.
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.
One client may want vinyl flooring and another may want heated floors with custom tile. Do you want a custom shower the most costly or a tub with tile on the walls? Solid surface counters, high-end fixtures or big box quality. Small 5x7 bathrooms can cost almost as much as a larger bathroom. The time to properly build a watertight custom shower is the same regardless of how big a room is or how much your home is worth. Have it done right rather than choose the lowest cost contractor. A years from now when your shower is still working perfectly you will be glad you spent a little more and gave your contractor the time to do excellent work. VInce
As you might imagine, I once had to sue a contractor. He demanded payments up front during different stages of work replacing a roof and front porch on my house. When he wanted to cheap out and use inferior materials, i insisted he do the job to specifications I had provided to him in writing beforehand. He walked away from the job, half completed, and I had to hire someone else to finish it. I recovered most, but not all, of the money he had stolen.
The average cost to gut and demolish a bathroom is $400 to $2,000. Prices depend on the room size, type of materials, which fixtures are being removed, if walls are being demolished, and if any damage is found in the subflooring or inner wall structure. You can DIY to save money, but hire a professional to inspect your electrical wiring and plumbing.
One client may want vinyl flooring and another may want heated floors with custom tile. Do you want a custom shower the most costly or a tub with tile on the walls? Solid surface counters, high-end fixtures or big box quality. Small 5x7 bathrooms can cost almost as much as a larger bathroom. The time to properly build a watertight custom shower is the same regardless of how big a room is or how much your home is worth. Have it done right rather than choose the lowest cost contractor. A years from now when your shower is still working perfectly you will be glad you spent a little more and gave your contractor the time to do excellent work. VInce

Often times, people confuse the difference between a master bathroom and a powder room. A master bathroom is a large bathroom that is attached to the master bedroom in a house. It is often big in size and contains a sink, toilet, shower, and bathtub. The bathtub and shower are either together or separate. A powder room is different in that it is a small bathroom only containing a toilet and a sink. Sometimes the name powder room is interchanged with guest bathroom or half baths. Powder rooms do not contain a shower, and is usually located on the first floor of a home. The purpose of a powder room is a bathroom for guests to use without feeling as if they are intruding into your home.
Don’t want your budget to skyrocket? Don't move your plumbing. On the surface, switching your sink and toilet around may look easy enough, but the problem lies underneath and all the costs involved in moving that plumbing. Besides, if you spend less money on moving fixtures, you’ll have more to spend on that new sleek shower system or vanity you’ve been eyeing.
Unless specified in Project Options list, this typical bathroom remodel estimate does NOT include costs for relocating, repairing, modifying or enhancing existing structural, HVAC, electrical and plumbing systems. Estimate common structural and system modification costs with the Room Modifications Cost estimator or the Home Addition Cost estimator.

Having an onsite dumpster should be your responsibility if it is something you are going to demand. They aren't cheap. Make suggestions or request a dumpster be included in the bid, but I would never start demanding anything when requesting proposals. They may have their own suggestions. We own a dump trailer and we bring it during demolition to handle the large debris. We have the trailer to avoid having to rent a dumpster on the job. If asked we can share this information, but if you require a dumpster instead we would have to take the time and research getting a dumpster to your house and add in costs we aren't accustomed to adding. That takes time and effort we may just not want to expend to give you a quote. Good contractors are generally very busy.
A punitive approach to what could be unforseen and atypical delays may be a bad idea. I would suggest offering a bonus for the job being completed early rather than a penalty for it being delayed. If material is ordered, we can't make it arrive faster if something delays the shipment. We recently ordered a bathtub requested by a customer. It was promised by our supplier for a Wednesday delivery. Bad weather hit Texas and it just didn't leave the warehouse until the following Monday. It blew up our schedule for the project and it wasn't anyone's fault or mistake. If we have an employee critical to the project get sick or injured, we may not be able to get things done as originally scheduled. Jobs can get off schedule for a lot of reasons outside the contractor's control. Charging them for those things is likely to turn them away.
Top that with contractors that don’t even provide a drawings, plans or official documentation of their intent and we can see where their seemingly in control of the market. Their swagger is even more overloaded when they’re excited to come view your home yet can’t call you back week after week months later because they’re too busy to even consider your meager $30-50k one-room remodel.
New to this site. My first thought is to the "DIY throw a bathroom together in a weekend" comment makers. Your comments about how much it cost you 2,000 to do a bathroom in your home correctly or incorrectly without a picture of the finished product is invalid in this forum. I had a customer spend 2k on a complete vanity, dumb comment. Second, I've agreed to the home owner supplying all the materials (one time mistake) and it was a total disaster after getting into the project. We know what we need when we go for supplies....plain and simple. A homeowner that purchases materials for a remodel they CAN'T handle for a contractor that CAN complete the task is like a mechanic ordering a transmission for a rear brake job....irresponsible. A good contractor listens to his customers, is given a budget, and decides if it is profitable for his company. If we give you a $7,000 price for a bathroom and you think it should be done for $5,000, I encourage the customer to get 2 more bids. I have faith in the quality of work I do, and if the customer doesn't see that from the very beginning, the transaction will be a nightmare. "JOE" your comment stuck out because its the unseen labor hours of modifying the old to fit the new that customers don't and will not ever understand. If you want something done right in your beautiful home, have the money set aside and then hire a contractor you trust to make your happy.
20% labor price ---out of the question----I'm a Building Contractor, If you are totally remodeling a bathroom, where is the cost for demo of existing???? Demo can easily run an extra 10%- factors: 1) Age of existing---many factors here to adjust price, 2) Accessibility ---Getting materials out of and to the bathroom, and protecting present surroundings of owner. 3) Cost to dispose of debris 4) Where is the Contractor's O & P ???
One client may want vinyl flooring and another may want heated floors with custom tile. Do you want a custom shower the most costly or a tub with tile on the walls? Solid surface counters, high-end fixtures or big box quality. Small 5x7 bathrooms can cost almost as much as a larger bathroom. The time to properly build a watertight custom shower is the same regardless of how big a room is or how much your home is worth. Have it done right rather than choose the lowest cost contractor. A years from now when your shower is still working perfectly you will be glad you spent a little more and gave your contractor the time to do excellent work. VInce
I acted as general contractor and did all my own demo to remodel my 6x8 bathroom. I hired subs individually to do most of the work - an electrician, a plumber, a drywall guy and a tile guy. I painted the walls and the ceiling. I replaced everything except the cast iron tub. Materials and fixtures cost around $2000 and labor was about $3000. My subs had no problem with me supplying the materials, because I discussed their job scope in advance. This project took 6 months but I did have another full bath to use in the mean time. 
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