ETA: I've gotta improve my reading comprehension! Now I see that you are replacing the counter - so maybe you could get one without a backsplash and do this, if you like the look!

I posted this a few minutes ago then deleted it when I realized you have an integrated backsplash. But now, I'm wondering how difficult/risky that is to remove? If possible to do, I was suggesting something like this, just framing out the mirror. Of course, that would only work if you can remove the backsplash and like this look. I hope Lauren doesn't mind me posting a pic of her gorgeous bath from another thread:

I don't think you will be able to get the mirror down or trim it without it breaking.

Could you paint the back edge of the cultured marble black, install it in front of the mirror and trim out the one end of the vanity to conceal the small gap?. Then the top of the backsplash could be caulked with a small bead of clear caulk. Painted black you would not really pick up much of the reflection of the back of the splash. Of course this would only work if everything is straight and it also means the mirror would be behind the countertop so the countertop would have to be pulled if the mirror needed to be replaced. But my feeling is that the mirror will break if you touch it. It's probably glued to the wall and will also cause drywall damage.

I must agree with Sophie on this one. Unless you're a little person, I can't fathom why you'd choose such a low replacement vanity!

@Olychick: That's a great looking bathroom!

Sammy, I agree! It belongs to Lauren0319 - she posted it on this thread: Lauren's Powder Room reveal

I had a similar mirror in my bathroom only mine was only 72" wide. It came down no problem and didn't break. It's still sitting in my garage years later.

I would NOT do low vanity.

We are definitely not doing a low vanity! We talked to our contractor and asked him to try to save the mirror when he takes it down. But we also added $1000 to our budget in case it breaks and we need a new one. We want to stick with the full mirror wall for that bathroom. Cabinets and counters were ordered today!

Yay! Good decision! The large mirror is nice to have so hopefully yours doesn't break. I went from a large mirror to two smaller ones and I don't mind it, but it's harder to see my outfit, especially since our new vanity is so much taller.

I had to remove a few mirrors from our bathroom. They were large, but not as large as yours. I found that by carefully hammering wooden shims between the mirror and the wall at multiple locations, I was able to pry the mirrors off of the wall without any of them breaking.

UPDATE: The mirror came down but did not survive. I got a quote for the new one, installed, for $550 which is better than I was expecting. The bigger surprise was finding profanities carved into the drywall behind the mirror... we assume left by a disgruntled contractor when the house was built in 2008!

Sorry to hear that the mirror didn't come down in one piece. But, on the bright side, you can now have a mirror made exactly the dimension you want and maybe even with cutouts for mirror-mounted sconces. From what I've read, the light from a sconce is better than the light from overhead fixtures in a bathroom.

Quick update... our home is complete, the bathroom is done, ad we have finally moved back home. Replacing the mirror ended up costing $750, but we are so happy with the outcome.

Do not for whatever reason have anyone cut the glass that will not back it with a $$$ guarantee. We run a waterjet service and we refuse to cut glass because it usually always breaks. What I suggest would be to keep everything the way you have it and just trip the backsplash, which should be an easy fix.

Thanks Designer Drains, we didn't go that route, had a brand new mirror installed to spec. it was well worth the expense!