The bathroom is the most private area within a household. Consider the bathroom in the context of your entire master suite and bedroom floor. The relationship of master bedroom, dressing/closet area, bathroom and entry into the suite from the hallway should be the foremost planning principle. From the bedroom, you walk through a dressing/closet area into the master bathroom, placing the bathroom in the farthest location from the entry.
Bathrooms should be big enough but not too big compared with the other spaces. They should be adequate and comfortable without being opulent.
Design a specific space for each of the most essential functions. For the sink area, design a contained counter area or a wall against which a sculptural pedestal sink can be displayed. The same space planning applies for the tub, shower and toilet area.
Figure out if you really need a separate tub and shower or if a combined/shower tub, or even just a shower, will serve your purposes.
Decide if the toilet needs its own room or whether it can be part of the open bathroom.
Avoid lining the plumbing fixtures against the wall. Instead, organize different functional areas around a central space, and give this space a room-like feel by creating tub alcoves, a recessed lavatory counter, or a recessed linen cabinet. Figure on the minimal space you need to move around in, and try not to let that grow within central square.
What do you see when the bathroom door is open? Do you look at a beautiful tub Or do you see a toilet with the seat up?
Carefully layout your floor plan, that is what you will ultimately end up seeing from the bathroom. What would you like your main focus to be in your bathroom? The hamper or a view across the bedroom out the window? Use the bathroom to make the bedroom bigger and vice versa.
Carefully select plumbing & lighting fixtures and finish materials in keeping with your tastes and with the essential character of the house. Hire a designer sympathetic to your tastes, to your home, and to your budget. Don’t believe expensive means better. There are many beautiful, inexpensive plumbing and lighting fixtures that can be used in lieu of the most expensive.
Always consider that your design response is proportional to the problem. If you have decided that your tub is a little too small, don’t take away from the master bedroom to make the tub bigger. When you are done planning, look over your bathroom plans. It should be smaller than your bedroom and, ideally, smaller than your dining room.Don’t let the bath take over; maintain balance in a master suite by keeping the bath smaller than the bedroom. It should be a pleasant space to be in, but the bathroom shouldn’t put the rest of the house to shame.