Seems to me that with new counter & vessel sink the only thing significantly raised is the bottom of the sink. You’ll also have to do some plumbing modifications to add under sink piping & of course now there’s a problem with either where backsplash was with the old counter or with the mirror which starts at backsplash height. Of course you’ll also need new faucets. It’ll be like pulling a thread. Do you like vessel sinks? They‘re decorative & generally a lot more costly than a bathroom sink which you can get for less than $100. If you already know it’s hard to find a 40” counter (I don’t know that), then how about get a new counter, you can get a quartz or granite remnant from a stone fabricator, get an undermount sink to maximize counter space, and have the vanity built up from the bottom. I know that can be done - a frame built to raise the vanity. Check out having vanity professionally refinished to clean up the oak - or professionally painted if you want to change color. Can’t say how much this will cost but how long will you be in this house & how much inconvenience is the too low vanity for the people using it every day? That will tell you if it’s worth it. It’s also a value add improvement to house.

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Depending on your bathroom layout you can use some ambient lighting. See below a couple of examples if you like modern. Let us know if we can help designing the perfect lighting fixtures for your bathroom. sale@galileelighting.com

Thank you, Joseph. I was also thinking of the same thing. If I do that the side splashes will be lower than the backsplash (the thickness of the vanity top). Will that look bad? Is there some filler I can add below the side splash to make it flush with the backsplash?