[masraum]

Originally Posted by gregpark

I see. I would cut that existing threshold back and undercut to slip the LVT under, with room to expand of course, but I have special saws to do this in place. Your jambs appear to be sitting on top of the threshold (not the norm) so without specialized saws I suggest cutting the bevel off the existing threshold and butt the LVT threshold (they're narrow) to the existing. (Ideally when a door is closed you don't see two different floors from either side.) All of this is assuming you're just covering the bath floor.
If this is the plan then I would suggest looking at LVT that resembles stone or tile and not wood plank. You'll not find an LVT that looks like the floor in the rest of the house

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Thanks