I’ve came across some small bathrooms in my last few rehabs. One was so small anybody over 200 pounds wouldn’t fit.
With that one I changed out the bathtub to one of those deep sitdown tubs, and moved the shower head and made a curtain rack. It cleared roughly 6 sq feet to move with.
The tub i bought is shown here
http://www.usatubs.com/Page2.html#C3 the space saver model. Normal only shower stall size but with higher walls to suit at a tub. I used it too before i sold the home. Good jets too.
One the sink fixture was on a cabinet and the corner would poke me walking to the toilet, I just made it a pedistool sink.
Any other ideas like these that would make a bathroom bigger? i find if i get the bathroom bigger my homes with only one sell easier and one is more acceptable. Same with kitchens. I knock walls out and make a counter area so barstools can go there too. opens up things.