" 1) to redo the entire shower- remove wall tiles and base and expand it another foot laterally; "

You will be removing a pretty good amount of floor tile to properly install a shower pan, even using a premanufactured base. Definitely remove the wall tile behind the tub as it very much looks out of place.

I don't see how you can do what you're talking about without ending up replacing the floor. Since you don't even like it, I don't know why you wouldn't. Have a conversation with a tile setter (not a GC) in the planning stages to see whether they think this can be done. If you do end up replacing the floor, see if you can move the toilet over to give yourself even more room for the shower. I don't know how your joists run, but when we remodeled our primary bath we moved the plumbing over to the next joist cavity which wasn't a big deal. You certainly have extra space to the corner.

If you do somehow ending up keeping the floor tile, white with light gray marble is not the right choice to go with the floor. This is a busy floor, everything else will have to be calm so they don't fight each other. See how the white toilet and tub are glaringly white against the floor? Putting more white in there is an attempt to ignore the floor. Look for warmer, darker tile to complement it. See how the wall color looks better with the floor than the white fixtures? But why let a floor you don't like drive your choices when remodeling? Investigate all the possibilities before moving forward.

Not every upgrade has to involve ripping out stuff. Here are some affordable suggestions to help you make your bathroom more of a refuge with connections to the outdoors, visible from your window:

--Remove tile next to tub. (Okay just a little ripping out.)

--Add wood shiplap/beadboard wall with same finish as vanity to frame your window, which seems to have a private view to outdoors and trees. Add floating shelves for plants next to the window. beadboard, lovely framed art, wicker baskets.

--Or create a gallery wall on window wall and bathtub wall with a mix of old landscapes.

--Upgrade hardware on current vanity--river stone pulls Add wood framed mirror(s).

--Add soft golden lighting as below.

--Paint bathroom sage and call it a day.

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More ideas for a sage green bathroom, a couple of which show painted vanity, which you could also do:

Think about wall shiplap or beadboard to add visual interest and texture to your generic bathroom.

beadboard back wall; stained glass window

I def think you can keep the floor but will need to be *very* careful with material selection to make it work - I would search for “bathroom with slate floors“ and see if you can find one or more you like, then mimic the materials. I think elements like warm wood and honed black will fit better with the floor than anything marble-like (grey veins) - I don’t love everything in this photo, but it seemed like a start

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What you must have is extra floor tiles saved from when these were installed. All you need is one of the demo workers to drop some tools and crack some floor tiles. Then what do you do?

I agree about moving the toilet and making the shower update worth the cost and time.

You are going to need to leave the shower the same size, or rip it all out. You're not going to make it bigger with a heated floor in the way.

Do you know what type of heated floor it is? If it is copper piping, then you can change thing around ( there may be a limit on the toilet move ) . If it is a simple matt system, they are not horribly expensive to change. In the long run , it maybe worth spending and extra $1500 - $2000 for a new heated floor so you can do anything you want.

Just a thought.