A 450 millimetre wide fixed panel and a 600 millimetre wide door panel work well for a typical 1500 millimetre tub.
Bathroom door height off floor.
The standard height of the rough opening for a door is the door height plus 2 5 8 inches.
Interior door height off floor.
I have never seen a door set with that big of a gap unless it was to get past floors that were not level.
To fix the issue the doors need to be removed bottom of the jambs cut and reset the door.
The ceiling in your bathroom must be at least 80 inches at the front of the sink or toilet and inside the shower.
This is because shower doors often are made of materials such as glass that can easily break and pose a danger.
I just took a quick look at some of standards and regulations governing door undercut which is the distance between a door and finished floor as opposed to clearance which is door to sub floor.
That is a lot of room for unlevel you have there.
At the back of the sink or toilet the ceiling height can be as low as 60 inches.
The height of common doors is 6 feet 8 inches.
The additional room allows for a 3 4 inch top jamb a shim.
Place the door handle at about 900 millimetres off the floor or wherever is comfortable for.
When determining the best towel bar height for your space you need to take into consideration how your bathroom is laid out sometimes the placement of outlets and light switches can affect things.
I prefer to run shower enclosure glass to the full ceiling height with the door just slightly below to allow for a free swing as i did in the bathroom shown here.
The standard recommendation for towel bar height is 48 from the floor to the center of the bar i tend to hang mine between 44 48 high.
The awi gives no minimum but a maximum of over 3 4 is unacceptable.
The standard i use is 1 2 over finish floors 3 4 is acceptable.
Toilet bathroom building codes.