It's totally legitimate for a professional to charge you for a design, at least in some situations. If the contractor has a book of ready-made designs and just pulled one out to show you, then you're right that s/he shouldn't charge you. But if someone does a design that conforms to your room's dimensions, with the features that you want, then that person has invested time in creating a work product. Some contractors and architects think that's just the cost of doing business, but many others consider that their time is worth something, and they charge for it. You just need to let contractors know that you're not looking for that kind of custom work, and not willing to pay for it.
I have a miserably small master bath with a particle board subfloor (house built 1969), so I must guy it. I bought toilet made for small bathrooms, and plan to pull the cabinet sink, replace with pedestal, raise storage like lighted bulkhead, demolish tile, and widen doorway from 28" to 32". I might gain 6" from tile removal alone, plus but another 6" on entrance with cabinet sink removal. Since large expense is in demolition, I could do that. But, install showers is tricky given the drain leveling so I'll hire a pro for that. Question: gutting, updating and repairing master bath is necessary, but to what extent should I go i, terms of resizing, which would entail bumping out wall into adjoining small room, which then adds expense of finishing that where window placement restricts encroachment. It's a nice older brick house that I bought before I realized the made of lapses and oversights by the home inspector (who also is a local top police official in a town with highly subjective law enforcement). I need to fix, list, well and leave. Any thoughts (and prayers much appreciated).

However, if you plan to add more square footage to your bathroom, that's where the expenses can really add up. Expanding the size of an existing small bathroom increases the total cost of a bathroom renovation project and lengthens the job's timeline. Some expansions may require permits, too, which may cost an additional fee and take time to secure.
Buying a new toilet might not be exciting, but it is necessary during most bathroom remodels. The major expense here, as you might guess, will be the price of the toilet itself. If you can deliver the toilet to your home by yourself, then the installation cost will be minimal. On average, the cost of a new toilet, as well as installation, comes in between $360 and $492.
This estimate for a 2019 Typical Bathroom Remodel is derived from the unit cost method summarized in the American Institute of Architects Detailed Cost Estimating - Best Practices. This approach is used by professional designers, contractors, engineers and estimators and uses current wages, material costs, worker productivity benchmarks, supervisory overhead and markup rates.
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.
Needless to say, the size of your bathroom will have a large say in your bathroom remodeling cost. Unfortunately, some smaller bathrooms take up a minimal 24sf. Replacing tile with hardwood will certainly increase your bathroom remodel cost, but it would not hurt as much if your bathroom was the more standard 50sf. Pine flooring can cost as much as $25/sf.
Both Lowe’s and Home Depot offer bathroom remodeling services. Home Depot remodels cost $5,000 for a powder room up to $30,000 for a master bathroom remodel. Lowe’s suggests that customers expect to pay at least $100 per square foot on bathroom remodels. Both stores offer repairs on your existing fixtures and installing upgrades or new replacement parts.
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.

It's so competitive out there. I am a Long Island contractor and I be realized lately that clients give you an impression when you give them there costs that you are doing something wrong. I've been in this Busines about 20 years and that avg cost is right there. Also homeowners should also realize if us contractors are using subs for our plumbing and electrical our costs are hire than the guy doing all the work himself. I only used licensed contractors for all my remodeling work.
The more luxurious the materials for a bathroom remodeling project, the higher your budget will be. Using marble for your counters, custom cabinetry or handpainted ceramic tiles for your new shower walls in the master bathroom will look terrific. But it will also raise your material costs considerably more than installing a laminate countertop and low-end or mid-range tiles.
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